20 Shore A High Tear Strength Tin Cure Silicone Rubber for Plaster Gypsum Molding and RTV-2 Condensation Cure Silicone Rubber Applications

Vulcanizing RTV-2 Tin Cure Silicone Rubber Raw Material for Plaster Gypsum Molding

HN-625 A/B is a two-component room temperature vulcanizing RTV-2 tin cure silicone rubber raw material with high tear strength of 19.8-24.3 kN/m. Engineered for plaster and gypsum molding, it delivers precise reproduction of large-scale sculptures, cultural stones and architectural elements.

Key Features

• High Tear Strength - 19.8-24.3 kN/m for long service life and frequent mold turnover
• Room Temperature Vulcanizing - Cures at room temperature with 100:2 mixing ratio, no heating required
• Low Shrinkage ≤0.2% - Precise reproduction of the finest and most complex details
• High Elongation 600-720% - Excellent flexibility for complex segmented molds
• Good Fluidity & Easy Demolding - Self-leveling, easy foam release, finished product will not turn white
• High & Low Temperature Resistance - Acid, alkali and aging resistant for demanding environments
• Customizable - Color, hardness, viscosity and operating time adjustable per requirements

Technical Specifications

Typical Applications

• Plaster & Gypsum Molding
• Large-Scale Stone & Cement Molds
• Cultural Stone & Roman Columns
• Resin & Gypsum Handicrafts
• Segmented Molds & Tire Turning Molds

As a direct factory manufacturer, we offer custom formulations and free evaluation samples. Contact our sales team today for bulk wholesale pricing.

About this supplier

Shenzhen Hanast New Material Co., Ltd. is a premier high-tech enterprise and leading source manufacturer specializing in the R&D, manufacturing, and global supply of industrial silicone materials. As a strategic branch of the renowned Shenzhen Kanglibang Technology Co., Ltd., Hanast integrates over a decade of chemical adhesive expertise with a cutting-edge 40,000-square-meter modern production base (including our newly expanding Jiangmen facility) to deliver high-capacity, reliable material solutions worldwide.

We serve as a vital tier-one supplier and OEM/ODM partner for global factories, procurement managers, and engineering teams across diverse sectors, including electric vehicles (EV), battery energy storage systems (BESS), solar inverters, LED lighting, and industrial automation.

FAQ

1. Q: What is the difference between tin cure and platinum cure silicone rubber?

A: Tin cure (condensation-cure) RTV-2 silicone cures at room temperature with a 100:2 mix ratio and is cost-effective for mold making, especially on cement, gypsum, resin, polyester and concrete masters. Platinum cure (addition-cure) offers tighter shrinkage control but can be inhibited by sulfur, tin, amine or certain resins. This HN-620 product is a tin cure silicone.

2. Q: What is the mix ratio and curing time of this 20 Shore A tin cure silicone?

A: Mix Component A and Component B at 100:2 by weight. Pot life is 30-40 minutes at 25°C, with full cure in 12-24 hours at room temperature (no heating required). Leaving it 24 hours before first use gives the most stable performance.

3. Q: Which applications is this silicone suitable for?

A: It is widely used for cement wall tile molds, decorative wall panels, precast and decorative concrete, cultural stone, artificial stone, gypsum, plaster, epoxy and polyester resin molds, polyurethane and vacuum casting, prototyping and general mold making. Softer grades suit candles and soaps, while harder grades suit rigid cement and concrete molds.

4. Q: Can you customize hardness, color, viscosity or packaging, and do you offer OEM/ODM?

A: Yes. As a factory-direct manufacturer we offer custom formulations (Shore A 5-50), custom color, viscosity adjustment and OEM/ODM packaging, plus free samples for testing.

5. Q: What are the MOQ, supply ability and delivery time?

A: MOQ starts at 20 kg. Supply ability is 50 tons per month with about 5-7 days lead time for samples and 10-15 days for bulk orders. Component A is packed in 25/200 kg iron drums with Component B in a proportional plastic bottle.