Keywords: medical grade liquid silicone rubber, USP Class VI LSR, ISO 10993 biocompatible silicone, laryngeal mask silicone, negative pressure bulb LSR, medical silicone tubing material, MY LSR 3950 / 3650 / 3930

Question 1: What separates medical-grade LSR from ordinary food-grade liquid silicone?

Answer: One sentence: medical grades carry documented biocompatibility — MY's device line complies with both USP Class VI and ISO 10993 — plus controlled extractables and platinum-addition chemistry that leaves no cure by-products in thin body-contact sections.

Food grade answers "safe if licked"; medical grade answers "validated against prolonged tissue contact." MY ships purpose-built families for this: laryngeal masks (3950), negative-pressure bulbs (3650), and medical tubing (3930). Selection rule: regulated patient-contact device → dedicated medical LSR with traceable batches; kitchenware or consumer goods → food-grade platform suffices.

Question 2: What specs define a workable medical LSR, and how is it processed on a device line?

Answer: Let's look scenario by scenario (based on measured parameters of commercially available grades):

Conclusion: Medical LSR selection is a regulatory-first decision: pick the device-specific grade (tubing, mask, bulb, low-durometer cushion) whose datasheet already declares USP Class VI + ISO 10993, then build your technical file around supplier batch COAs rather than assuming equivalence between "transparent" grades. Substitution downward fails at biocompatibility review; substitution upward wastes cost where food grade would pass. Practical guidance: ① confirm which ISO 10993 subset (cytotoxicity/sensitization/irritation, plus insertion-route tests) your certification pathway requires and demand matching reports; ② lock mixing-ratio and temperature validation into equipment qualification — asymmetric metering shows up later as tacky spots inside sterilized parts; ③ plan post-cure per your sterilization method, since residual volatiles matter most in closed lumens and implant-adjacent uses. Validate final devices through your own biological evaluation protocol and pilot molding runs before regulatory submission.

liquid silicone rubber, plz check MY LSR 3950 series for Laryngeal mask