Hydroxy PDMS is hydroxyl‑terminated polydimethylsiloxane, CAS 70131‑67‑8. This RTV‑2 base polymer is specially optimized for concrete and plaster casting molds. After compounding with reinforcing silica fillers, silane cross‑linker and organotin catalyst, it cures into tough flexible silicone rubber. The finished mold owns outstanding tear resistance, low linear shrinkage and good anti‑abrasion property, widely applied for decorative

Product Detail

Product Overview

Hydroxy PDMS is hydroxyl‑terminated polydimethylsiloxane base polymer, CAS 70131‑67‑8. This condensation‑cure PDMS is developed for heavy‑duty concrete and plaster mold‑making. Viscosity and hydroxyl value are strictly controlled for every batch. When combined with reinforcing fillers and curing system, it forms high‑strength elastic silicone rubber which resists abrasion from cement‑based materials. Stable raw‑material quality supports mass production of architectural decorative casting molds.

Key Features

Purpose‑built hydroxy terminated PDMS for concrete and plaster RTV‑2 molds
Stable hydroxyl terminal groups for steady condensation cross‑linking reaction
Superior wetting and dispersion for high‑loading reinforcing silica fillers
Cured silicone exhibits excellent high tear resistance
Low linear shrinkage to maintain dimensional stability of patterns
Good abrasion resistance against concrete and plaster medium
High fidelity reproduction of complex stone, brick and decorative textures
Suitable for repeated demoulding in heavy‑load casting scenarios
Compatible with conventional silane cross‑linkers and organotin catalysts
Low volatile content, reliable batch‑to‑batch consistency

Main Applications

RTV‑2 flexible molds for concrete and cement casting
Plaster, gypsum and architectural ornament reproduction molds
Decorative concrete stamp and paving moulds
Large‑size landscape and building decoration casting molds
Custom silicone compound for cement‑based material casting
Heavy‑duty molds requiring high tear strength

Processing Suggestions

Complete feeding, kneading and mixing operations under strictly moisture‑free environment. Incorporate reinforcing silica fillers, silane cross‑linking agent and organotin catalyst according to mold formulation. Adjust filler loading to achieve target hardness and tear strength. Avoid moisture contamination throughout full production process, moisture will lead to incomplete curing and surface tacky defects.

Storage & Packing

Packed in sealed 200kg iron drum. Store in cool, dry and ventilated warehouse. Keep drum tightly sealed. Protect from humidity, high temperature and direct sunlight. Reseal drum immediately after partial material discharge. Proper storage preserves polymer reactivity and ensures valid shelf‑life.

Previous : 107 Polymer for Candle Soap Mold CAS 70131-67-8 Food Contact Compatible Next : 107 Silicone for Gypsum Cornice Mold CAS 70131‑67‑8 Low Shrinkage RTV‑2 Condensation Cure PDMS

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Hydroxy PDMS for Concrete Plaster Mold CAS 70131-67-8 High Tear Resistance

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.