OH Terminated PDMS is hydroxyl‑terminated polydimethylsiloxane, CAS 70131‑67‑8. It is specially developed base polymer for resin casting RTV‑2 silicone molds. After compounding with silica fillers, silane cross‑linker and organotin catalyst, it cures into flexible silicone rubber. The finished mold shows good chemical resistance against epoxy, PU and polyester resin, low linear shrinkage and excellent detail replication, widely used for art crafts, ornaments and industrial resin casting producti

Product Detail

Product Overview

OH Terminated PDMS is hydroxyl‑terminated polydimethylsiloxane base polymer, CAS 70131‑67‑8. This condensation‑cure PDMS is optimized for RTV‑2 resin casting molds. Hydroxyl value and viscosity are strictly controlled batch‑by‑batch. When combined with reinforcing fillers and curing system, it forms elastic silicone rubber with good anti‑swelling performance for epoxy, PU and polyester resin. Stable raw material quality supports mass production of resin‑casting flexible molds.

Key Features

Purpose‑designed OH terminated PDMS base for resin casting RTV‑2 mold silicone
Stable hydroxyl end‑groups for steady condensation cross‑linking reaction
Excellent wetting and dispersion for reinforcing silica fillers
Good chemical resistance to epoxy, PU and polyester resin
Low linear shrinkage, keeps dimensional accuracy of complex patterns
High tear strength, suitable for repeated demoulding cycles
Superior fine‑detail reproduction for delicate handicraft textures
Compatible with conventional silane cross‑linkers and organotin catalysts
Low volatile components, reliable batch‑to‑batch consistency

Main Applications

Flexible molds for epoxy resin casting
Molds for PU resin and polyester resin handicraft production
Art craft, decoration and souvenir reproduction moulds
Small‑batch industrial parts casting and duplication molds
RTV‑2 condensation‑cure silicone compound for resin casting
Custom mold formulations contacting epoxy, PU and polyester resins

Processing Suggestions

Carry out feeding, kneading and mixing under fully moisture‑free workshop conditions. Incorporate reinforcing silica fillers, silane cross‑linking agent and organotin catalyst according to mold formula. Adjust filler loading to reach target hardness and tear strength. Prevent moisture ingress throughout production process to avoid incomplete curing and sticky surface defects.

Storage & Packing

Packed in sealed 200kg iron drum. Store in cool, dry and ventilated warehouse. Keep drum tightly sealed. Avoid 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 Silicone Rubber Base for Mold Making CAS 70131-67-8 RTV-2 Condensation Cure Next : 107 Polymer for Candle Soap Mold CAS 70131-67-8 Food Contact Compatible

Copy product links

Long by picture save/share

Add Successfully

Continue To Visit Inquiry Now

OH Terminated PDMS for Resin Casting Mold CAS 70131-67-8 for Epoxy PU Polyester

enquiry

Add Successfully

Continue To Visit Inquiry Now

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.