PVC COMPOUND ST-3
about the product
PVC Compound ST‑3 is a thermoplastic sheathing compound specifically formulated for flexible and flat cables. It provides excellent thermal, mechanical, and insulation properties for general-purpose cable jackets used in a wide range of environments.
1. Temperature Range: Designed for −15 °C to +70 °C operation, balancing flexibility with durability .
2. Sheathing Quality: Offers high flexibility (TM‑2 category under EN/BS standards) and excludes cavity formation around cable cores
3. Electrical Insulation: Maintains excellent dielectric strength consistent with PVC sheathing compounds (no adhesion to conductors)
4. Physical & Chemical Resistance: Combines flame resistance, chemical stability, and mechanical robustness typical of PVC formulations.
1. Flat Flexible Cables: Especially for interconnection and appliance wiring (voltage up to 450/750 V)
2. General-Purpose Sheathing: Ideal for industrial, domestic, and light outdoor cables where moderate environmental resilience is needed
1. Cable Thickness Guidelines: For flat cables with conductor sizes from 1.5 mm² to 25 mm² – typical sheath thickness (e₂) is around 1–1.5 mm, with sidewall clearance values (e₃) ranging 1.4–2.0 mm
2. Packaging Formats: Usually supplied as pellets or powder in industrial bags (25 kg/50 lb), though precise packaging can vary per manufacturer.
1. Indian Standard: Complies with IS‑5831 (PVC compounds) and IS‑694 (cable sheathing materials) for ST‑3
2. European/British Standards: Conforms to BS 7655/EN 50363‑4‑1 (TM‑2 classification)
3.IEC Standard: Aligned to IEC‑60502 cable sheathing requirements relevant to ST‑3 compounds
1. T‑3 Grade: Flexible compound (TM‑2) for low to moderate temp range (−15 °C to +70 °C) .
2. Other Comparables:
I. ST‑1 (TM‑1) – similar flexibility for same temp ratings.
II. ST‑2 (TM‑1 or TM‑2) – extended use up to 90 °C.
III. Higher grades: TM‑53 (up to 105 °C), ST‑2 FR/FRLS (low-smoke/flame retardant)