Engineered for Reliability – IOTA HTV 327 for Cable Accessory Insulation
When performance under high voltage and mechanical stress is non‑negotiable, material selection defines the outcome. The IOTA HTV 327 series, a platinum‑catalyzed silicone rubber, is formulated specifically for cable accessories such as cold‑shrink tubing and insulating sleeves.
This 43 Shore A hardness grade offers a balanced profile: soft enough for easy extrusion and installation, yet firm enough to maintain dimensional stability in service. Its William plasticity value of 150 supports smooth, continuous processing, reducing scrap rates during high‑speed production lines.
Electrical integrity is the cornerstone of this material. With a dielectric constant of 3.03 at 100 Hz and a dissipation factor of 0.0029, it minimizes signal attenuation and energy loss. The volume resistivity reaches 1.0×10¹⁵ Ω·cm, while the breakdown strength stands at 23 kV/mm – figures that support stable operation in medium‑voltage applications.
Mechanically, the compound delivers a tensile strength of 10.0 MPa and an elongation of 900%, allowing it to accommodate thermal expansion and contraction without cracking. Tear strength of 45 kN/m further resists propagation of defects during installation or under vibration.
The platinum‑cure system ensures clean, by‑product‑free crosslinking, with low volatile content – advantageous for sensitive conductor interfaces. Recommended curing conditions (130°C, 10 minutes under pressure, plus post‑cure at 200°C for 4 hours) yield consistent properties across batches.
Supplied in 20‑kg cartons, the material remains stable for 6 months when stored below 50°C in unopened containers. For users seeking a proven, field‑tested silicone for extruded cable accessories, IOTA HTV 327 offers a reliable technical foundation.