Overview
White silicone material is a high-performance elastomer derived from silicon, oxygen, carbon, and hydrogen. Unlike organic rubbers, it maintains flexibility across extreme temperatures (-60°C to 250°C) while resisting UV radiation and chemical degradation. The white coloration is achieved through non-toxic pigments, making it suitable for applications requiring aesthetic uniformity. Industrial-grade white silicone typically contains reinforcing fillers like silica to enhance tensile strength. Medical and food-contact variants undergo strict purification processes to eliminate contaminants. This material's versatility stems from its customizable hardness (Shore A 10-80) and formulation options including high-consistency rubber (HCR) and liquid silicone rubber (LSR).
Physical and Chemical Properties
White silicone exhibits exceptional thermal stability, retaining elasticity at both cryogenic temperatures and under prolonged heat exposure. Its dielectric strength (15-20 kV/mm) makes it valuable for electrical insulation. The material demonstrates low compression set (<10% after 22 hours at 175°C), ensuring long-term sealing performance. Chemically, silicone resists oxidation, ozone, and UV radiation better than organic rubbers. It shows moderate resistance to acids and alkalis but swells in hydrocarbon solvents. The surface energy (24 mN/m) contributes to non-stick properties and easy release characteristics. Typical tensile strength ranges from 4-12 MPa, with elongation at break exceeding 300% for most formulations.
Main Applications
In industrial settings, white silicone serves as gaskets in automotive engines, seals for photovoltaic panels, and vibration dampers in machinery. Its FDA-compliant versions dominate kitchenware production (baking molds, spatulas) and food processing equipment due to non-toxicity and easy cleaning. The medical sector utilizes implant-grade white silicone for prosthetics, tubing, and wound care products. Electronics manufacturers employ it for keyboard pads, touchscreen components, and potting compounds. Emerging applications include 3D printing filaments and wearable technology where flexibility and biocompatibility are paramount.
Safety and Storage
Uncured silicone raw materials may contain volatile siloxanes—proper ventilation is essential during processing. Cured white silicone presents minimal hazards, though dust from machining operations should be controlled. Medical applications require USP Class VI or ISO 10993 certification to confirm biocompatibility. Storage recommendations include maintaining products in original packaging at <30°C with <70% humidity. Bulk rolls should be stored horizontally to prevent deformation. Shelf life typically exceeds 12 months when protected from moisture and ozone exposure. Avoid contact with strong acids, bases, or sharp objects that could compromise material integrity.
B2B Procurement Guide
Industrial buyers should specify required certifications (UL, NSF, RoHS) and physical parameters (hardness, tensile strength) when sourcing white silicone. For molded components, provide detailed drawings including tolerances (±0.5mm is typical). Liquid silicone rubber (LSR) requires injection molding equipment, while HCR suits compression or transfer molding. Leading manufacturers include Dow Silicones, Wacker Chemie, and Shin-Etsu. MOQs for custom formulations often start at 500kg, with lead times of 4-8 weeks. Sample testing is recommended to verify colorfastness and performance under intended operating conditions. Consider working with distributors like Elkem Silicones or Momentive for smaller quantities and technical support.
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