Fire-Resistant by Design, Reliable by Certification – IOTA-HTV 325 Series
In industries where fire safety is non‑negotiable, material selection makes all the difference. The IOTA‑HTV 325 Series – including models 32540 through 32580, and the white variant 32550W – delivers halogen‑free flame retardancy backed by UL94 V‑0 classification at 1 mm thickness. This is not a self‑declared rating; it is verified through the UL Yellow Card program, providing an extra layer of confidence for component manufacturers, cable compounders, and molded parts producers.
Beyond flame resistance, these silicone rubbers offer balanced mechanical performance. Hardness ranges from 40 to 80 Shore A, allowing you to match soft sealing applications or rigid structural inserts. Tensile strengths sit between 4.5 and 7.0 MPa, while elongation at break extends up to 400% – enough flexibility for complex profiles without sacrificing dimensional stability. Tear strength from 12 to 20 kN/m further supports durable part design under repeated stress or assembly handling.
All grades comply with RoHS and REACH requirements, simplifying global market access. The recommended cure system uses 0.5% dicumyl peroxide (double 2,5) at 175°C for 5 minutes under 15 MPa pressure, producing 2 mm test specimens that consistently meet the V‑0 standard. Whether you need black or white color, the 325 series maintains stable processability, with density ranging from 1.38 to 1.52 g/cm³ depending on formulation.
Packaged in 20 kg cartons, the material stores stably at room temperature for up to 12 months unopened; for optimum processing, we recommend using within 6 months from production. Extended storage is possible, though we advise re‑verifying key properties before production runs. For specification development, our technical team is available to discuss your exact requirements – because fire safety should never be an afterthought.