Overview
High viscosity silicone is a semi-solid elastomer derived from cross-linked polysiloxanes, combining rubber-like elasticity with exceptional durability. Unlike low-viscosity silicones, its thick consistency allows for gap-filling and structural applications without sagging. Developed in the mid-20th century, it revolutionized industries requiring materials that withstand temperature extremes and mechanical stress. This material is typically supplied as two-component systems (base + catalyst) or as ready-to-use compounds. Its non-reactive nature makes it suitable for food-grade and medical applications, though formulations must be carefully selected for compliance with industry standards like USP Class VI or FDA 21 CFR 177.2600.
Physical and Chemical Properties
With viscosities ranging from 100,000 to over 1,000,000 centipoise (cP), high viscosity silicone exhibits pseudoplastic flow—becoming less viscous under shear stress during application. Its backbone of alternating silicon and oxygen atoms provides inherent thermal stability, retaining flexibility from -60°C to 250°C without cracking or hardening. Chemically, it resists oxidation, UV radiation, and most acids/alkalis, though concentrated sulfuric acid and ketone solvents may cause swelling. Electrical properties include dielectric strength of 15–25 kV/mm and volume resistivity >10^14 Ω·cm, making it ideal for insulating high-voltage components. Shore A hardness typically ranges from 20 to 80, adjustable with fillers like silica.
Main Applications
In automotive manufacturing, high viscosity silicone seals engine gaskets and protects wire harnesses from heat and vibration. The aerospace industry uses it for vibration damping in avionics and thermal protection in rocket components due to its low outgassing properties. Medical device manufacturers employ medical-grade variants for prosthetics and surgical instrument coatings, leveraging its biocompatibility. In construction, it serves as expansion joint filler in bridges and high-rise buildings, accommodating structural movement while resisting weathering. Emerging applications include soft robotics and wearable electronics, where its flexibility and conductivity (when doped) are advantageous.
Safety and Storage
Uncured silicone components may contain platinum catalysts or organic peroxides, requiring handling with nitrile gloves and eye protection. Ensure adequate ventilation during curing to avoid inhalation of acetic acid (from acetoxy-cure types) or ethanol (from alkoxy-cure systems). Store components separately in original containers, avoiding contamination with sulfur-containing materials that can inhibit curing. Shelf life is typically 6–12 months; extendable to 24 months when refrigerated at 4°C. Dispose of uncured material as chemical waste—cured silicone is inert and may be landfilled per local regulations.
B2B Procurement Guide
For industrial buyers, key specifications include: cure time (from minutes to days), tear strength (≥30 kN/m for demanding applications), and compression set (<20% after 22h at 150°C). Request technical datasheets with ASTM D2000 or ISO 9001 certifications. Bulk purchasing (200+ kg drums) reduces costs by 15–30%, but consider minimum order quantities (MOQs) from manufacturers like Dow, Wacker, or Shin-Etsu. For custom formulations, lead times of 4–8 weeks are common. Container shipments require desiccants to prevent moisture absorption during transit. Sample testing under actual operating conditions is strongly recommended before large-scale procurement.
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