Question 1: Both are platinum-cured medical silicones — what actually separates "solid" from "liquid"?

Answer: One sentence: same biocompatibility promise, completely different processing route — solid (HTV/gum) is milled, cut, and compression- or extrusion-molded; liquid (LSR) is pumped, metered 1:1, and liquid-injection-molded in seconds.

MY HTV 340 series is a medical-grade platinum-cured gum compound: Shore 36–80A, tensile up to 10 MPa, elongation up to 1050%, tear up to 35 kN/m, supplied as 20 kg cartons, processed by extrusion or compression molding after adding catalyst. MY LSR 3930/3950/3650 series are two-component addition LSRs at a fixed 1:1 ratio, 275–365 Pa·s mixed viscosity, delivered in 200 kg drums for automatic metering into LSR injection machines. Selection rule: tubing, sheeting, large or simple-profile parts → solid HTV; high-precision, thin-wall, high-volume parts → liquid LSR.

Question 2: Where do they diverge in real production and part performance? Can they substitute for each other?

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

Conclusion: They overlap in hardness and strength but not in manufacturing strategy — you can't economically compression-mold a 1:1 LSR drum, and you can't injection-mold a thin-wall laryngeal mask from gum stock at competitive cycle times. Practical guidance: ① for tubing at moderate volume, HTV 340 extrusion is still the lowest tooling-cost route; ② for Class II devices with complex geometry or million-piece volumes, LSR 3930/3950 pays back the higher tooling cost quickly; ③ if your design needs sub-Shore-10A softness, only the LSR 327L family gets there. Two compliance caveats: ① "medical grade" is a starting point, not an approval — confirm the specific ISO 10993 subset (cytotoxicity, sensitization, irritation) and USP Class VI reports your regulatory file requires, and note that HTV parts contacting food/body must be post-cured at 200 °C × 4 h; ② switching between the two routes requires re-validating extractables, bond strength, and sterilization compatibility, not just mechanical data. Verify with your own biocompatibility and process validation batches.

Antibacterial silicone rubber-Precipitated, plz check MY HTV 338 series