Hydroxy Terminated PDMS 100000 cst CAS 70131-67-8 for Two Component RTV Rubber
Hydroxy Terminated PDMS 100000 cst is hydroxyl‑terminated polydimethylsiloxane, CAS 70131‑67‑8. This high‑viscosity 107 silicone base is developed for two‑component condensation‑cure RTV‑2 rubber. It shows outstanding wetting performance for silica reinforcing fillers. After mixing with cross‑linker and organotin catalyst, cured rubber exhibits high elasticity, low linear shrinkage and good tear strength. It is widely applied in craft molds, industrial duplication moulds and custom flexible RTV
Product Overview
Hydroxy Terminated PDMS 100000 cst belongs to hydroxyl‑terminated polydimethylsiloxane family, CAS 70131‑67‑8. This high‑viscosity condensation‑cure base polymer is specially engineered for two‑component RTV‑2 silicone rubber. Viscosity and hydroxyl value are strictly controlled batch‑by‑batch. Combined with reinforcing fillers and matched curing system, it forms flexible cross‑linked silicone rubber. Rigorous quality inspection ensures stable performance for mass production of two‑part RTV rubber products.
Key Features
- 100000 cst high viscosity designed for two‑component condensation cure RTV rubber
- Uniform hydroxy terminal groups for adjustable and stable cross‑linking reaction
- Excellent wetting and dispersing capacity for reinforcing silica fillers
- Cured silicone rubber features high elasticity and good tear resistance
- Low linear shrinkage after full curing for high‑precision reproduction
- Fine detail replication for complex pattern mould application
- Good compatibility with silane cross‑linkers and organotin catalysts
- Low volatile content, reliable batch‑to‑batch consistency
Main Applications
- Two‑component condensation‑cure RTV‑2 silicone rubber
- Craft, sculpture and decorative article reproduction molds
- Molds for resin, gypsum, wax and low‑melting‑point material casting
- Industrial prototype duplication and flexible tooling rubber
- Custom flexible silicone parts requiring high elasticity
- Various high‑performance mold‑making silicone compound formulations
Processing Suggestions
Complete feeding, kneading and mixing operations under moisture‑free workshop environment. Blend with reinforcing silica fillers, silane cross‑linking agent and organotin catalyst. Adjust filler dosage according to target hardness, tear strength and shrinkage index. Avoid moisture contamination in whole production process, otherwise it will cause incomplete curing and surface tacky problems.
Storage & Packing
Packed in sealed 200kg iron drum. Store in cool, dry and ventilated warehouse. Keep drum tightly sealed. Keep away from humidity, high temperature and direct sunlight. Reseal drum immediately after partial material discharge. Proper storage maintains polymer reactivity and guarantees shelf‑life.
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