Overview
Two-component liquid silicone is a premium elastomer consisting of a base (Part A) and a curing agent (Part B) that polymerize upon mixing. Unlike single-component silicones, it cures without atmospheric moisture, enabling thicker applications. The material combines the flexibility of rubber with exceptional thermal and chemical resistance. First developed in the mid-20th century for aerospace applications, modern formulations meet stringent requirements in medical and food-contact industries. Its self-leveling properties make it ideal for precision applications like electronic potting or creating detailed molds for casting resins and low-melt metals.
Physical and Chemical Properties
After curing, two-component silicone exhibits a unique combination of properties: Shore A hardness typically ranges from 10 (gel-like) to 80 (firm rubber), with tensile strength of 4-12 MPa. It maintains elasticity across extreme temperatures (-50°C to 250°C intermittently) and resists ozone, UV light, and most chemicals except strong acids/bases. The liquid components have viscosities from 1,000 to 100,000 mPa·s, adjustable with thixotropic additives for vertical applications. Cure times vary from minutes (platinum-catalyzed) to hours (tin-catalyzed), with shrinkage below 0.1%. Dielectric strength exceeds 20 kV/mm, making it valuable for electrical insulation.
Main Applications
In healthcare, medical-grade silicones (ISO 10993 certified) form soft tubing, respiratory masks, and implantable devices due to biocompatibility. Electronics manufacturers use it for potting circuit boards and creating gaskets in LED lighting, where thermal conductivity additives dissipate heat. Automotive applications include ignition wire boots and sensor seals that withstand engine heat. Artisans and industrial molders rely on its release properties and fine detail reproduction for casting urethane or epoxy parts. Recent innovations include optical-grade silicones for lens prototypes and soft robotics components mimicking human tissue elasticity.
Safety and Storage
Uncured components may contain platinum or tin catalysts that can irritate skin—nitrile gloves are recommended. Mixing generates minimal VOCs, but ventilation is advised, especially with tin-based systems that emit trace alcohols. Store Part A and Part B separately in original containers; cross-contamination causes premature curing. Shelf life is typically 6-12 months; expired material may show viscosity changes or incomplete curing. Dispose of waste according to local regulations—cured silicone is inert but should not be landfilled in bulk. Fire hazards are low (autoignition >400°C), but burning silicone releases irritating silica fumes.
B2B Procurement Guide
For industrial buyers, key specifications include: cure system (platinum for medical/clear parts, tin for cost-sensitive uses), viscosity (low for thin coatings, high for 3D shapes), and post-cure requirements (some grades need oven baking). Request Technical Data Sheets (TDS) with elongation %, tear strength, and compression set data. Medical buyers should verify USP Class VI, FDA 21 CFR 177.2600, or EU 10/2011 compliance. Bulk orders (200kg+) often reduce costs by 15-30%. Consider premixed/frozen LSR cartridges for automated dispensing. Reliable Asian suppliers include Shin-Etsu and Wacker, while Momentive (US) and Elkem (EU) dominate Western markets.
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