REMOLINDO HOFFMAN, special administrator, [Note 1] vs. HOUGHTON CHEMICAL CORPORATION & another [Note 2] (and a companion case [Note 3]).

CIVIL ACTION commenced in the Superior Court Department on October 3, 1989.

The case was before Maria I. Lopez, J.

The Supreme Judicial Court on its own initiative transferred the case from the Appeals Court.

Richard T. Tucker, for the plaintiffs.

Joseph A. Regan for Houghton Chemical Corporation.

F. Dore Hunter (Michael J. Calabro with him) for Unocal Chemicals Division, Union Oil Company of California.

The following submitted briefs for amici curiae:

Hugh F. Young, Jr., of Virginia, David R. Geiger, & Hilary J. Ames for The Product Liability Advisory Council, Inc.

Douglas K. Sheff, John J. St. Andre, & Jodi Petrucelli for The Massachusetts Academy of Trial Attorneys.

MARSHALL, C.J. On March 6, 1989, an explosion and fire ripped through Gotham Ink of New England, Inc. (Gotham), an ink manufacturer in Marlborough. The blast killed two workers and severely injured several others. The plaintiffs commenced these personal injury and wrongful death actions against three manufacturers and suppliers of the chemicals allegedly involved in the conflagration: Exxon Company, U.S.A. (Exxon); Unocal Chemicals Division, Union Oil Company of California (Unocal); and Houghton Chemical Corporation (Houghton). [Note 4] After nearly six weeks of testimony at a consolidated trial on the plaintiffs' claims for negligence and breach of warranty for faulty product design and failure to warn, the jury returned special verdicts in favor of all defendants, and the complaints were dismissed. The plaintiffs filed a motion for a new trial that was denied. The plaintiffs have appealed, and we transferred the

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cases to this court on our own motion. [Note 5] A pivotal question in this appeal concerns the duty of a bulk supplier to warn all foreseeable users of the risks associated with a product's use. We adopt the "bulk supplier doctrine" as an affirmative defense in products liabilities actions, and affirm the judgments.

I

The trial record is voluminous; we summarize only the evidence on which the jury could have based their verdicts that is relevant to the issues on appeal.

The defendants manufacture and supply chemical products in bulk. Unocal supplied Gotham with acetone and methanol in fifty-five-gallon drums. Unocal and Houghton supplied Gotham with toluene, which was delivered by tanker truck and stored in Gotham's large underground storage tanks. All three chemicals, which were involved in the tragic explosion, are highly volatile, flammable solvents.

There was extensive testimony concerning the nature and extent of instructions and warnings given by the defendants to Gotham. Prior to the date of the explosion and in the course of their dealings with Gotham, both Unocal and Houghton periodically supplied Gotham with documents detailing the properties and safe handling of the chemicals. Houghton gave Gotham material safety data sheets (MSDS) for toluene that had been supplied by the manufacturer, Exxon. The MSDS warned the company, among other things, to keep toluene away from sparks and static electricity. The MSDS also contained "empty drum warnings," advising Gotham of the specific dangers relating to the reuse of empty containers. [Note 6] Houghton also provided its own empty drum warnings to Gotham.

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Unocal gave Gotham MSDS for acetone and methanol that had similar warnings about product flammability, the need to avoid contact with ignition sources, and the importance of not storing the product in unreconditioned drums. Additionally, Unocal issued drum label warnings with its methanol and acetone products, and its drum labels indicated in words and pictorially that the drum contents were flammable.

The defendants had ample reason to believe that Gotham was a knowledgeable purchaser of their products, able to understand the product warnings and to pass appropriate safety warnings on to their employees. As an ink manufacturer for the industrial market, Gotham annually purchased thousands of gallons of flammable chemicals. In compliance with Occupational Safety and Health Administration (OSHA) regulations, the company had grounding devices in its receiving and production areas designed to dissipate any static charge accumulated in the transfer of chemical solvents from one container to another.

Gotham also had an independent obligation under OSHA regulations to train employees about workplace safety. The evidence established that, although the company was not in full compliance with an OSHA-mandated hazard communication program for training and providing safety information to employees, [Note 7] Gotham periodically conducted safety meetings with its employees. Additionally, its supervisors and laboratory personnel often reminded employees of the importance of bonding and grounding when transferring solvents. For Portuguese-speaking workers, such as the plaintiffs' decedents Hoffman and Sobrinho, whose knowledge of English was limited, the warnings were given in Portuguese by a bilingual foreman and his son.

The evidence established that, prior to the explosion, Gotham had on hand a small library of books and other materials by the defendants, other suppliers, and noted authorities concerning the safe transfer of flammable solvents. In December, 1987, Gotham issued its own MSDS to its customers of "press wash," a cleaning

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solvent composed of equal parts of acetone, methanol, and toluene. [Note 8] The Gotham MSDS correctly advised that press wash was an OSHA 1B flammable liquid that was 100% volatile and that required special precautions in handling, including avoiding exposure to sparks and grounding all vessels when pouring from one container to another.

The jury reasonably could have found that Gotham, although aware of its obligations to provide a safe workplace and able to carry out those obligations, was lax in its safety procedures. Of relevance here, the company allowed workers to use unreconditioned drums to transfer chemical solvents and to place containers of flammable solvents on dollies with nonconductive wheels. There was no evidence that the defendants were aware that Gotham had not enforced the safety precautions as advised by Houghton and Unocal.

On the day in question, the decedent Remolindo Hoffman, who had been instructed to prepare a batch of press wash, was transferring toluene from a grounded pump in the production area to a rusty, unreconditioned drum containing residue from a previous batch of press wash. A jury reasonably could have found that Hoffman used an ungrounded dolly to place the "empty" drum on the grounded weighing scale, and that he dispensed the toluene without attaching back-up grounding clips to the drum. The ungrounded solvent transfer created a static spark that ignited vapors in and around the drum, causing the blast.

II

A

At the close of the evidence, the trial judge, over the plaintiffs' objection, instructed the jury on the so-called "bulk transfer doctrine" set out in the margin. [Note 9] To evaluate this challenged

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instruction for error, we must inquire whether the instruction should have been given, and, if so, whether the instruction as given was proper. To both we answer in the affirmative.

B

Because the plaintiffs claim that the judge instructed the jury on the "bulk transfer/sophisticated user" doctrine, we resolve first some thorny issues of terminology. There is confusion, including by the plaintiffs, between the "bulk supplier doctrine" and the "sophisticated user defense." These are separate, conceptually discrete affirmative defenses available to defendants in certain products liability actions. See Donahue v. Phillips Petroleum Co., 866 F.2d 1008, 1012 (8th Cir.1989). [Note 10]

The bulk supplier doctrine allows a manufacturer-supplier (supplier) of bulk products, in certain circumstances, to discharge its duty to warn end users of a product's hazards by reasonable reliance on an intermediary. See Forest v. E.I. DuPont de Nemours & Co., 791 F.Supp. 1460, 1463 (D.Nev.1992);

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Jones v. Hittle Serv., Inc., 219 Kan. 627, 637 (1976). In contrast, the sophisticated user defense protects a supplier from liability for failure to warn when the end user knows or reasonably should know of a product's dangers. Donahue v. Phillips Petroleum Co., supra at 1012 (applying Missouri law). For the bulk supplier doctrine to apply, a product must be delivered in bulk to an intermediary vendee. The relevant inquiry turns on the intermediary's knowledge of a product's hazard and its ability to pass on appropriate warnings to end users. See, e.g., Sara Lee Corp. v. Homasote Co., 719 F.Supp. 417, 424 (D.Md.1989). The sophisticated user defense, on the other hand, requires no intermediating relationship and need not involve bulk transactions; the relevant inquiry turns on the end user's level of sophistication. See Hall v. Ashland Oil Co., 625 F.Supp. 1515, 1520 (D.Conn.1986).

Both doctrines seek to advance the goal of products liability law to prevent accidents. The bulk supplier doctrine applies where a warning is necessary to apprise end users of product hazards. See, e.g., Adams v. Union Carbide Corp., 737 F.2d 1453, 1457 (6th Cir.) cert. denied, 469 U.S. 1062, (1984). The sophisticated user doctrine applies where a warning will have little deterrent effect. Cf. Bavuso v. Caterpillar Indus., Inc., 408 Mass. 694, 699, (1990), quoting Colter v. Barber-Greene Co., 403 Mass. 50, 59, (1988) ("where the danger presented by a given product is obvious, no duty to warn [exists] because a warning will not reduce the likelihood of injury"). Put another way, the bulk supplier doctrine allows a fact finder to find that the duty to warn has been satisfied; the sophisticated user doctrine allows the fact finder to determine that no such duty was owed. [Note 11]

Manifestly, the jury instruction at issue here concerned only

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the bulk supplier doctrine. The instruction directed the jury to determine whether the products were delivered in bulk; to assess whether the defendants gave "adequate and sufficient" warning about the products to the "immediate purchaser" (that is, to Gotham); and to determine whether the defendants' reliance on Gotham to warn the ultimate users of the products was reasonable in light of the latter's sophistication and ability to pass on its knowledge of product hazards. See Forest v. E.I. DuPont de Nemours & Co., supra. The instruction did not permit the jury to find that the defendants had no duty to warn the plaintiffs of the products' dangers, nor did it require the jury to assess the degree of the plaintiffs' sophistication about the products' dangers. We therefore consider only whether a "bulk supplier" jury instruction is consistent with our law.

C

The bulk supplier doctrine originates in the Restatement (Second) of Torts § 388 comment n (1965). [Note 12] See generally Cheney, Not Just for Doctors: Applying the Learned Intermediary Doctrine to the Relationship Between Chemical Manufacturers, Industrial Employers, and Employees, 85 Nw. U. L. Rev. 562 (1991). Comment n addresses the duty to warn in that wide array of commercial contexts in which products are supplied to an intermediary, who in turn supplies the products, often repackaged or reformulated, to others. In such circumstances, the supplier's duty to warn may be discharged by informing the intermediary of the product's character and the care required to use the product safely. Restatement (Second) of Torts, supra. To avoid liability for failure to warn, however, the supplier must

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have "reasonable assurance that the information will reach those whose safety depends upon their having it." Id.

The reasonableness inquiry is fact intensive; no bright-line rule can "automatically determine" when reliance on the intermediary is reasonable. Id. See Ditto v. Monsanto Co., 867 F.Supp. 585, 592 (N.D.Ohio 1993), aff'd, 36 F.3d 1097 (6th Cir.1994), quoting Adkins v. GAF Corp., 923 F.2d 1225, 1230 (6th Cir.1991). Among the factors that may determine reasonable reliance are "(1) the dangerous condition of the product; (2) the purpose for which the product is used; (3) the form of any warnings given; (4) the reliability of the third party as a conduit of necessary information about the product; (5) the magnitude of the risk involved; and (6) the burden imposed on the supplier by requiring that he directly warn all users." Sara Lee Corp. v. Homasote Co., supra at 421, quoting Goodbar v. Whitehead Bros., 591 F.Supp. 552, 557 (W.D.Va.1984), aff'd. sub nom. Beale v. Hardy, 769 F.2d 213 (4th Cir.1985).

Our previous decisions concerning a product liability defendant's duty to warn have been guided by the Restatement (Second) of Torts § 388 generally, and by comment n specifically. See, e.g., Bavuso v. Caterpillar Indus., Inc., supra at 700; Slate v. Bethlehem Steel Corp., 400 Mass. 378, 381-382 (1987); MacDonald v. Ortho Pharmaceutical Corp., 394 Mass. 131, 135-136, cert. denied, 474 U.S. 920 (1985); Schaeffer v. General Motors Corp., 372 Mass. 171, 174 (1977).

In MacDonald v. Ortho Pharmaceutical Corp., supra, we held that a supplier of a potentially dangerous product has a duty to warn all foreseeable users of known or reasonably foreseeable hazards of the product's use, but that, in certain limited circumstances, "a manufacturer may be absolved from blame [for failure to warn] because of a justified reliance upon ... a middleman," so long as such reliance is reasonable. Id., quoting Carter v. Yardley & Co., 319 Mass. 92, 99 (1946), and citing Restatement (Second) of Torts, supra. We explained that, in such circumstances:

"[T]he manufacturer's immunity from liability if the consumer does not receive the warning is explicable on the grounds that the intermediary's failure to warn is a

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superseding cause of the consumer's injury, or, alternatively, that, because it is unreasonable in such circumstances to expect the manufacturer to communicate with the consumer, the manufacturer has no duty to warn the consumer."

Id. at 136.

We can imagine few more appropriate circumstances in which to apply these principles than in the context of bulk sales. First, as a practical matter, the nature and function of bulk products are different from those of many other consumer and industrial goods and thus require separate consideration. Bulk products often are delivered in tank trucks, box cars, or large industrial drums, and stored in bulk by the intermediary, who generally repackages or reformulates the bulk product. Even if the product could be labeled by the supplier, any label warnings provided to the intermediary would be unlikely to reach the end user. Often, too, the bulk product has multitudinous commercial uses. Toluene, for instance, is used in gasoline, as well as printing ink; acetone is an ingredient of both nail polish remover and press wash; methanol, another press wash component, commonly known as "wood alcohol," is used in antifreeze. To impose on bulk suppliers a duty to warn all foreseeable end users directly where the product cannot readily be labeled for such users (if it can be labeled at all); where the intermediary is often in a different industry from that of the supplier, with different means of production; and where the end users themselves are a remote and varied lot would be unduly, indeed crushingly, burdensome. See, e.g., Ditto v. Monsanto Co., supra at 592, citing Cohen v. Steve's Ice Cream, 737 F.Supp. 8 (D.Mass.1990); Fisher v. Monsanto Co., 863 F.Supp. 285, 289 (W.D. Va.1994); Forest v. E.I. DuPont de Nemours & Co., supra at 1465; Jones v. Hittle Serv., Inc., supra at 637-638.

Second, the intermediary vendee, particularly the large industrial company, has its own independent obligation to provide adequate safety measures for its end users, an obligation on which bulk suppliers should be entitled to rely. The bulk supplier rarely has any control over the intermediary's personnel policies or day-to-day safety operations. See Forest v. E.I. DuPont de Nemours & Co., supra; Sara Lee Corp. v. Homasote Co., supra at 424;

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Reed v. Pennwalt Corp., 22 Wash.App.Ct. 718, 723-724, aff'd, 93 Wash. 2d 5 (1979). Thus, the bulk supplier simply is "not in a position to constantly monitor the turnover of an employer's workforce" or "to provide the good housekeeping measures, training and warnings to [the intermediary's] workers on a continuous and systemic basis." Fisher v. Monsanto Co., supra at 289, quoting Goodbar v. Whitehead Bros., supra at 566. [Note 13] In the oft-quoted words of the authors of comment n: "Modern life would be intolerable unless one were permitted to rely to a certain extent on others' doing what they normally do, particularly if it is their duty to do so." Restatement (Second) of Torts, supra.

The goal of products liability law is to "induce conduct that is capable of being performed." Vassallo v. Baxter Healthcare Corp., 428 Mass. 1, 21 (1998). The bulk supplier doctrine advances that goal by permitting a bulk supplier to satisfy its duty to warn by reasonable reliance on an intermediary who understands the product's risks and is able to pass on to end users warnings about the product's hazards. [Note 14] Under the bulk supplier doctrine, the bulk supplier is by no means absolved of its duty either to supply adequate warnings to the intermediary or to ensure that its reliance on the intermediary is reasonable, but is permitted to discharge its duty to warn in a responsible and practical way that equitably balances the realities of its business with the need for consumer safety. We adopt the bulk supplier doctrine as an affirmative defense to products liability negligence claims. See Part II E, infra (breach of warranty claims).

D

We now turn to the issue whether the bulk supplier instruction

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given by the judge was proper in this case. We conclude that, in all respects but one, the instruction clearly, adequately, and correctly [751 N.E.2d 858] explained the applicable law to the jury. See Torre v. Harris-Seybold Co., 9 Mass. App. Ct. 660, 678-679, 404 N.E.2d 96 (1980). See also Back v. Wickes Corp., 375 Mass. 633, 638, 378 N.E.2d 964 (1978) (correctness of jury charge "determined not in the abstract, but by reference to the state of the evidence in the case"). The instruction properly required that the jury consider whether the defendants supplied their products in bulk; whether they gave "adequate and sufficient" warning; whether they had no reason "to anticipate any negligence or other fault" on the part of Gotham; and whether the defendants "had no indication" that Gotham "was inadequately trained, or unfamiliar with the product, or incapable of passing on its knowledge about the product to the ultimate users of the product." The jury were further instructed that the "application of this doctrine turns on the reasonableness of the defendants' reliance on Gotham to provide adequate warnings." See Part II A, supra. All these instructions were proper. [Note 15]

However, the judge also instructed the jury to consider whether Gotham, as an employer, "was in the best position to monitor the provision of warnings to its individual employees or users, and train its individuals and employees." We recognize that such "best position" language is found in other bulk supplier decisions, generally to explain why the bulk supplier doctrine is sound public policy. See, e.g., Forest v. E.I. DuPont de Nemours & Co., supra at 1465 ("far better position"); Sara Lee Corp. v. Homasote Co., supra at 422 ("better position"). [Note 16] However, we think that requiring a jury to assess in hindsight whether the bulk supplier or the immediate purchaser was in the "best position" to convey adequate warnings of a product's dangers injects a measure of uncertainty, of arbitrariness that

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undercuts the very raison d'etre of the doctrine, and may mislead a jury about the applicable law. All that is required to determine whether the bulk supplier has discharged its duty to warn is for the jury to evaluate the reasonableness of the bulk supplier's reliance on the intermediary. This is an objective standard. Sara Lee Corp. v. Homasote Co., supra at 424. To overlay this inquiry with a second, subjective "weighing" requirement is unlikely to advance consumer safety, but is highly likely to create the kind of uncertainty that increases production costs and spurs on litigation.

The "best position" language of the judge's bulk supplier doctrine instruction, then, was given in error. However, as the faulty instruction increased the defendants' burden, not that of the plaintiffs, there was no reversible error. See Galvin v. Welsh Mfg. Co., 382 Mass. 340, 343 (1981) (no reversible error unless claimed error affects party's substantial rights).

E

The plaintiffs claim that the bulk supplier instruction allowed the jury to confuse the defendants' duty to warn under the plaintiffs' negligence theory with the defendants' duty to warn under the plaintiffs' breach of implied warranty theory. The argument is unavailing.

The record makes clear that the judge's bulk supplier instruction was given under the negligence charge and that she was careful expressly to separate her negligence from her strict liability instructions. [Note 17] The judge also allowed jurors to have copies of her instructions during deliberations, further obviating any possibility that her clearly delineated instructions would be confused. When jurors, during deliberations, posed a question to the judge about the scope of the bulk supplier doctrine, she

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conferred at length with counsel and returned a response to which the plaintiffs, but not the defendants, agreed. There is, quite simply, no evidence that the negligence charge somehow migrated to and infected the jury's deliberations on the breach of implied warranty claim.

We do note that the jury reached their determination on the breach of implied warranty claim prior to our deciding Vassallo v. Baxter Healthcare Corp., supra. In that case, we rejected the much-maligned "hindsight" analysis of the duty to warn in implied warranty failure to warn cases. That analysis required a manufacturer or supplier to warn foreseeable users of all risks associated with a product, regardless of whether such risks were or reasonably could have been known at the time the warning was given. Id. at 20-23. Joining the majority of jurisdictions and the authors of the Restatement (Third) of Torts: Products Liability § 2(c) (1998), we expressly incorporated a reasonableness analysis into an implied warranty failure to warn claim, holding that "a defendant will not be held liable under an implied warranty of merchantability for failure to warn or provide instructions about risks that were not reasonably foreseeable at the time of sale or could not have been discovered by way of reasonable testing prior to marketing the product." Id. at 23. [Note 18]

In Vassallo v. Baxter Healthcare Corp., supra, we implicitly recognized that negligent failure to warn and failure to warn under breach of warranty are to be judged by the same standard: the reasonableness of the defendant's actions in the circumstances. [Note 19] We expressly recognize that convergence now. Under our holding in Vassallo, then, an instruction on the bulk supplier doctrine may apply to both a claim of negligent failure

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to warn and a claim of breach of warranty failure to warn in products liability actions. [Note 20]

F

Finally, we reject the plaintiffs' contention that, even if it were proper to give an instruction on the bulk supplier doctrine, the judge's instruction was clearly erroneous because it failed to specify the "factors to be weighed" in assessing reasonable reliance. Once again, the focus of the bulk supplier doctrine "is not on the knowledge of the raw material suppliers but rather on the knowledge of the industrial purchaser." Sara Lee Corp. v. Homasote Co., supra at 424. In focusing the jury's deliberations on whether the defendants had reason to anticipate fault on Gotham's part, and on Gotham's ability to understand and to pass along warnings about the products' dangerousness, the judge fairly, completely, and accurately apprised the jury of the elements of reasonable reliance. See Torre v. Harris-Seybold Co., 9 Mass. App. Ct. 660, 678-679 (1980). No more was required.

III

The plaintiffs raise three other issues on appeal, none novel or complex. They contend that the judge's instructions on the duty to warn were inadequate, that the judge erred in admitting certain OSHA standards in evidence, and that the judge made erroneous rulings regarding an alleged absent witness. We are unpersuaded by the plaintiffs' arguments on these issues, which we discuss briefly.

The plaintiffs claim that the judge's failure to give certain of their proposed instructions left the jury with insufficient guidance

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to determine the adequacy of the warnings given. There was no error. The plaintiffs have failed to identify with specificity any alleged defect in the actual wording of the jury instructions that substantially would have affected their rights. See Galvin v. Welsh Mfg. Co., supra. All that is left of their argument, therefore, is simply that they would have preferred that the jury hear their version of instructions rather than the instructions actually given by the judge. However, a "judge is under no obligation to charge the jury in the specific language requested by a party." Corsetti v. Stone Co., 396 Mass. 1, 14-15 (1985), quoting Cooke v. Walter Kidde & Co., 8 Mass. App. Ct. 902, 904 (1979). See Jacobs v. Pine Manor College, 399 Mass. 411, 414 (1987). We will not determine reversible error absent instructions that, taken as a whole, are incomplete, inaccurate, or otherwise improper. See Torre v. Harris-Seybold Co., supra. Such was not the case here.

Unavailing, too, is the plaintiffs' contention that OSHA regulations were improperly admitted in evidence. [Note 21] The plaintiffs' appeal is grounded in the judge's denial of their motion in limine to preclude the OSHA regulations. However, the plaintiffs cannot rest on a motion in limine to preserve their appellate rights. See Vassallo v. Baxter Healthcare Corp., supra at 12, citing Commonwealth v. Gabbidon, 398 Mass. 1, 7 (1986). The consequence of the failure properly to object at trial is to waive the issue on appeal. See Adoption of Carla, 416 Mass. 510, 515 (1993).

In any event, there was nothing amiss in admitting the regulations. The OSHA regulations were relevant to, although not dispositive of, the standard of care Gotham owed to its workers to protect them from workplace hazards. See Herson v. New Boston Garden Corp., 40 Mass. App. Ct. 779, 793 (1996). See generally Torre v. Harris-Seybold Co., supra at 671-673.

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Such evidence buttressed the defendants' defense that Gotham's actions were the sole proximate cause of the plaintiffs' injuries. It is "elemental" that the defendants had the right to assert such a defense and to support it with relevant evidence. See Correia v. Firestone Tire & Rubber Co., 388 Mass. 342, 352 (1983). The judge did not err in admitting the OSHA standards.

We also see no merit in the plaintiffs' argument that the judge erred by failing to give an absent witness instruction, and by ordering the plaintiffs' counsel not to refer to the witness's absence in closing arguments. The principles governing absent witnesses are well established: an instruction and comment by counsel on an absent witness are proper only when, without reasonable explanation, a party fails to call a person of whom the party is aware, can bring to trial, and who "is friendly to, or at least not hostilely disposed toward the party, and who can be expected to give testimony of distinct importance to the case." Commonwealth v. Zagranski, 408 Mass. 278, 287 (1990), quoting Commonwealth v. Schatvet, 23 Mass. App. Ct. 130, 134 (1986). Because absent witness instructions and comments might unfairly prejudice a jury, they must be used with caution. Commonwealth v. Zagranski, supra. In cases where it appears that the witness is likely to be favorable to each side, no inference should be drawn from the witness's failure to take the stand. Commonwealth v. Schatvet, supra at 134 n. 8. Further, a decision not to call a witness for tactical reasons does not necessarily lead to the inference that the witness's testimony would have been adverse to the nonproducing party. Cf. Evans v. Multicon Constr. Corp., 6 Mass. App. Ct. 291, 294 (1978).

Here, for at least four reasons, the "missing" witness, Houghton's vice-president and safety manager, Joseph Lima, was not "absent" in any way that would have justified absent witness rulings favorable to the plaintiffs. First, the plaintiffs themselves could have called him. Lima was listed on their pretrial witness list, and several witnesses called by the plaintiffs testified to postaccident contacts with Lima during which a "red light-green light system" for preventing ungrounded solvent transfers purportedly was discussed.

Second, Lima's absence on surrebuttal was attributable not to

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improper conduct but to Houghton's reasoned, tactical decision in the wake of the judge's limitation of testimony. The plaintiffs argue that Houghton had an obligation to call Lima on surrebuttal in response to testimony from the plaintiffs' rebuttal witness, Gotham's plant manager, Thomas Malloy. On rebuttal, Malloy, who did not testify during the plaintiffs' case-in-chief, attempted to refute the testimony of two Houghton witnesses that, prior to the date of the explosion, he had attended at least one "open house" at Houghton during which Lima demonstrated the "red light-green light" system. Houghton did request permission to call Lima and others to refute Malloy's testimony, but the judge limited Houghton to one surrebuttal witness only. That Houghton chose to call as this witness a former client, a person whom it deemed less vulnerable to cross-examination, was a tactical decision for which no sanction was appropriate.

Third, even if he had taken the stand, Lima's testimony on the red light-green light issue would have been cumulative. See Commonwealth v. Schatvet, supra at 134. Once Houghton's witnesses testified that Lima gave a tour that Malloy attended and Malloy denied it, the issue was one of credibility for the jury to decide. [Note 22] Uloth v. City Tank Corp., 376 Mass. 874, 882 (1978). Fourth, despite the judge's admonition to the contrary, in his closing argument the plaintiffs' counsel did refer to Lima's absence.

In these circumstances, the judge properly declined to permit the plaintiffs to capitalize on the fact that Lima did not testify. See United States v. Ariza-Ibarra, 651 F.2d 2, 12-13 (1st Cir.1981). There was no error.

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IV

For all of the foregoing reasons, we affirm the judgments for the defendants.

So ordered.