PVC COMPOUND TYPE S-2 FR
about the product
ST‑2‑FR is a flame‑retardant, low‑smoke PVC compound designed as an outer sheath material for XLPE and PVC‑insulated power/telecom cables. It aligns with Indian Standard IS 5831 (ST‑2 FR/FRLS) used globally in wiring and cable industries
1. Flame Retardant / Low Smoke: Oxygen index ≥ 30%, low smoke emission—often halogen‑free variants available .
2. Thermal Stability: Maintains integrity at elevated temperatures; typical thermal stability ≥ 100 min @ 200 °C
3. High Dielectric & Mechanical Properties:
I. Tensile strength ≥ 12.5 N/mm²
II. Elongation ≥ 150% pre‑ and post‑aging
4. Aging Resistance: After 7 days at 100 °C, TS and EB variations capped at ±25% (sometimes ±20%)
5. Low Temperature Flexibility: No cracking down to −15 °C; retains ≥ 20% elongation
1. Cable Sheathing for medium to high voltage power and control cables up to ~90 °C operating temperature
2. Telecom, Robotic, Automotive, and Fiber Optic cable sheaths
3. Used widely in domestic, industrial, and outdoor wiring to comply with fire safety standards.
1. Supplied as uniform granules/ pellets in various colors per customer need .
2. Packaging:
I. 25 kg kraft paper bags
II. Jumbo bulk bags (800–1000 kg) for large orders
III. Typical container loads: ~18 t (20 ft), ~25 t (40 ft)
1. Elongation at break (unaged): ≥ 150%
2.Tensile strength (unaged) : ≥ 12.5 N/mm²
3. Density: 1.50–1.60 g/cm³
4. Thermal stability : (200 °C) ≥ 100 minutes
5. Oxygen index: ≥ 30%
6. Temperature index: ≥ 275 °C (indicative of safety rating)
1. Virgin resin base, often enhanced with aluminium trihydroxide (ATH) to boost flame retardancy
2. Additive package tuned for processing (extrusion), compatibility, colour stability, and mechanical consistency.