Overview
Sheath compound is a polymer-based material engineered for cable and wire insulation. Composed primarily of polyolefins (e.g., polyethylene or PVC) with additives like plasticizers, stabilizers, and flame retardants, it balances mechanical protection with electrical insulation. The material is available in granular form for extrusion processes. Industrial demand focuses on durability under environmental stress (moisture, temperature, abrasion). Custom formulations address sector-specific needs, such as halogen-free compounds for construction or LSZH (Low Smoke Zero Halogen) variants for public spaces.
Physical and Chemical Properties
Typical sheath compounds exhibit tensile strengths of 10–20 MPa and elongation at break exceeding 300%, ensuring flexibility during installation. Additives enhance properties: carbon black for UV resistance or antimony trioxide for flame retardancy. Chemically inert, these materials resist oils, acids, and alkalis but may degrade under prolonged UV exposure without stabilizers. Density and melt flow index (MFI) vary by base polymer—LDPE formulations are lighter (0.92 g/cm³) versus rigid PVC (1.4 g/cm³).
Main Applications
Over 70% of sheath compounds serve the cable industry, including power transmission (up to 1kV), telecommunications, and automotive wiring. Specific uses include underground coaxial cables (requiring moisture resistance) and mining cables (needing abrasion resistance). Non-cable applications include protective tubing for sensors and hydraulic systems. Niche markets use colored compounds for identification or anti-rodent additives in agricultural settings.
Safety and Storage
While generally safe, processing at high temperatures (>200°C) may release fumes—adequate ventilation is crucial. Storage lifespan is typically 12–24 months; moisture-sensitive formulations require sealed containers. Disposal follows local polymer waste regulations. Incineration of halogenated compounds requires scrubbers to neutralize acidic gases. Suppliers provide Material Safety Data Sheets (MSDS) with handling specifics.
B2B Procurement Guide
Key procurement criteria include: certification compliance (e.g., UL 94 for flammability, RoHS for heavy metals), MFI matching extrusion equipment (2–10 g/10min is common), and color consistency for branding. Bulk orders (20+ metric tons) often secure 8–15% discounts. Verify supplier testing capabilities—smoke density tests for tunnels or cold bend tests (-40°C) for Arctic applications. Sample testing under project conditions is recommended.
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