When Clarity Meets Resistance – The Molding Compound That Stays Bright

In high-end keypads, seals, and precision molded parts, yellowing is the silent killer of perceived quality. Once discoloration sets in, even the best design loses its premium appeal. That is exactly why IOTA-HTV311 series was developed – not just as a silicone compound, but as a reliability partner for manufacturers who refuse to compromise on appearance and performance.

This high-anti-yellowing molding gum delivers exceptional transparency and process stability, making it an ideal choice for light‑colored or translucent components exposed to heat, light, or long‑term use. Whether you are producing automotive interior seals, medical device gaskets, or consumer electronics buttons, the IOTA-HTV311 series ensures your finished parts retain their original visual integrity far longer than standard materials.

The series covers a full hardness range from 30 to 80 Shore A (models 31130 through 31180), allowing you to match mechanical requirements precisely. Tensile strengths reach up to 8.5 MPa, while elongation at break varies from 200 % to 700 % – giving designers the flexibility to balance soft touch with durable resilience. Tear strength remains consistently above 15 kN/m across all grades, ensuring robust performance in assembly and service.

Processing is straightforward and reproducible. Using 1.0 % of a 50 % bis(2,4-dichlorobenzoyl) peroxide cure system, 2 mm test specimens are molded at 175 °C for 5 minutes under 15 MPa pressure. The resulting parts show excellent mold release, low compression set, and minimal post-cure shrinkage – all of which translate into higher production yields and lower scrap rates.

Importantly, the IOTA-HTV311 series complies with ROHS, REACH, and FDA requirements, giving you confidence for global markets, including food‑contact and sensitive electronic applications. Supplied in 20 kg cartons, the material maintains a shelf life of 18 months when stored unopened below 50 °C.

For engineers and purchasers alike, this product line represents a balanced solution: anti-yellowing without sacrificing transparency, processability without compromising strength, and compliance without complexity. When your application demands lasting aesthetics and reliable mechanics, IOTA-HTV311 is the grade you can trust from first trial to mass production.