Thе plaintiffs in these diversity cases brought products liability actions against E.I. du Pont de Nemours and Company (DuPont) claiming they were injured by medical prostheses manufactured with DuPont materials. The district court granted summary judgment in favor of DuPont, and the plaintiffs’ suits were consolidаted on appeal.
I.
After experiencing problems with their temporomandibular joints (TMJ) (the joint connecting the upper and lower jaw), the plaintiffs received a medical prosthesis known as the Proplast TMJ Interpositional Implant. After implantatiоn, plaintiffs allege that the Proplast TMJ Implants failed, abrading the surrounding bone and triggering immune system reactions. The plaintiffs were required to undergo further surgery to remove the implants and, in some cases, to reconstruct the facial bones.
The Proplast TMJ Implant was designed, manufactured and sold by Vitek, Inc., a now-bankrupt company founded by Dr. Charles Homsy, a former DuPont scientist. In the late 1960s, Homsy developed and patented the biomaterial “Proplast,” a spongy implant material designed to encourage tissue in-growth. Proplast is made by combining carbon and soluble ingredients with polytetra-fluorethylene (PTFE, better known by its tradename Teflon), a safe and inert plastic sold in resin, powder or fiber form. Although the physical and mechanical properties of Teflon changе during the multi-stage Proplast manufacturing process, its chemical composition remains the same. The Proplast TMJ Implant is a pre-formed Proplast device, and received FDA approval for sale in 1983.
DuPont supplied Vitek with the Teflon for the Proplаst TMJ Implants. Plaintiffs allege that DuPont knew that Vitek intended to use the Teflon to manufacture Proplast TMJ Implants, and at one point considered entering into a joint marketing agreement with Vitek. DuPont also knew that Teflon implants had met with mixed success. In particular, published studies in the 1960s had shown that Teflon tended to abrade when used in hip implants.
When Vitek first sought to purchase Teflon from DuPont, DuPont informed Vitek of these studies of hip implants. DuPont also advised Vitek that its Teflon was industrial grade and had not been manufactured for medical аpplications, and that DuPont had not studied its suitability for medical use. DuPont conditioned the sale of Teflon on Vitek’s acknowledgement of DuPont’s disclaimers and agreement to use its own medical judgment as to the safety of Teflon in the TMJ Implant. Upon passagе of the Medical Device Amendments of 1976 to the Federal Food, Drug and Cosmetic Act, 21 U.S.C. § 301 et seq., DuPont again wrote to Vitek, reiterating that Teflon was not manufactured for medical purposes and Vitek would be required to exercise its own judgment and comply with all FDA regulаtions.
The plaintiffs contend that DuPont knew that Teflon was not appropriate for use in the Proplast TMJ Implant. The plaintiffs alleged three theories of liability: that DuPont was strictly liable for selling an unreasonably dangerous product; that DuPont was strictly liable for fаiling to warn both Vitek and the plaintiffs that Teflon was unsuitable for use as a TMJ Implant; and that DuPont was negligent in supplying Teflon to Vitek and failing to warn plaintiffs when it knew that it was unsafe in human implants. DuPont responded that it owed no duty to the plaintiffs for injury caused by a specializеd end-use of its product; that the Teflon in *1106 Proplast was substantially altered; that DuPont satisfied any duties since Vitek was a sophisticated purchaser; and that any state claims were preempted by federal drug laws.
The district court granted summary judgment to DuPont, finding that it owed no duty of care to the plaintiffs since “it is simply not responsible for a product that it did not create.” We, of course, review the grant of summary judgment de novo.
II.
Whether DuPont owed a duty to the plaintiffs is a question of law.
Kirk v. Michael Reese Hospital and Medical Ctr.,
it left the manufacturer’s control.
Lamkin v. Towner,
A.
A design defect will render a product unreasonably dangerous when the product is “dangerous to an extent beyond that which would be contemplated by thе ordinary consumer who purchases it, with the ordinary knowledge common to the community as to its characteristics.”
Lamkin,
But the plaintiffs do not contend that Teflon is an inherently dangerous product with no safe applications. Clearly, Teflon is a raw material with many safe uses; it only became dangerous whеn Vitek incorporated it into a highly specialized medical device, the Pro-plast TMJ Implant. 1 The drafters of the Restatement took no position on whether § 402A applies in this context, but did offer some commentary:
If, for example, raw coffee bеans are sold to a buyer who roasts and packs them for sale to the ultimate consumer, it cannot be supposed that the seller will be relieved of all liability when the raw beans are contaminated with arsenic, or some other poi-son_ On the othеr hand, the manufacturer of pigiron, which is capable of a wide variety of uses, is not so likely to be held *1107 to strict liability when it turns out to be unsuitable for the child’s tricycle into which it is finally made by a remote buyer. The question is essentially one of whether the responsibility for discovery and prevention of the dangerous defect is shifted to the intermediate party who is to make the changes.
Restatement (2d), § 402A, comment p.
Illinois courts have largely followed the logic of the Restatement. While manufacturers of inherently dangerous raw materials will be held liablе for injury caused by their product,
Hammond,
The rule is particularly applicable when an inherently safe raw material is used in thе manufacture of a highly specialized finished product. Illinois adopted the doctrine of strict products liability to ensure that the loss caused by unsafe products is borne by those who created the harm, who derive economic benefits from them, and, impоrtantly, “who are in a position to eliminate the unsafe character of the product and prevent the loss.”
Hebel v. Sherman Equip.,
We believe that, in this case, the Illinois courts would not place that burden on DuPont. Teflon was a safe, raw material. DuPont informed Vitek that Teflon was not manufactured and had not been tested for use in mediсal devices. Although the plaintiffs allege that DuPont was intimately aware of Vitek’s plans for developing and marketing a Proplast TMJ Implant, they have not alleged that DuPont had any control over the design or composition of the Proplast TMJ Implants, or that there was a manufacturing defect in the Teflon. “[Tjhere is a marked difference between knowing the identity of the equipment into which a component part will be integrated and anticipating any hazardous operation by that equipment that might be facilitаted by the addition of the component part.”
Childress v. Gresen Mfg. Co.,
B.
A product that is not inherently dangerous may be considered defective if the manufacturer fails to warn of its non-obvious dangers. A manufacturer need warn only of dangers of which it knоws or should know.
*1108
Woodill v. Parke Davis & Co.,
We find that DuPont’s warnings to Vitek were sufficient as a matter of law. DuPont warned Vitek of everything that it knew; the plaintiffs have put forth no evidence from which a jury could find that DuPont should have known anything more. Indeed, when DuPont told Vitek about the studies on hip implants, Dr. Homsy replied that he was familiar with those studies, had been in contact with their author, but believed for numerous reasons that a Proplast TMJ Implant would function better than the pure Teflon hip implant. Moreover, a duty to warn arises only when there is unequаl knowledge with respect to the risk of harm,
Smith v. American Motors Sales Corp.,
DuPont’s duty to warn did not, however, require it to warn physicians and the plaintiffs. Were Teflon an inherently dangerous raw material, DuPont would have a duty to warn the plaintiffs, as well as Vitek, of its hazards.
Hammond,
C.
The plaintiffs also brought causes of action in negligence, alleging that DuPont was negligent in selling Teflon to Vitek, and negligent in failing to warn Vitek and the plaintiffs of Teflon’s unsuitability. But the elements of negligence and of strict liability do not differ in any sense relevant here. For the same reasons that DuPont is not strictly liable for the plaintiffs injuries, it was not negligent in either selling the product or failing to warn the plaintiffs of the risk of failure in a Proplast TMJ Implant.
The district court’s grant of summary judgment is therefore AFFIRMED.
Notes
. There is a factual dispute about whether Teflon was changed significantly in the Proplast manufacturing process. If the Teflon underwent significant changes that were not foreseeable to DuPont, DuPont would not be held liable to the plaintiffs.
Thomas v. Kaiser,
. DuPont argues in support of its judgment below that the Medical Device Amendments of 1976, 21 U.S.C. § 360
et seq.,
preempt state actions against manufacturers of bulk medical supplies. 21 U.S.C. § 360k(a).
See LaMontagne
v.
E.I. Du Pont de Nemours & Co.,
