Low Shrinkage ≤0.2% Tin Cure Silicone Rubber 25 Shore A with High Tear Strength for Sculpture Molds

Low Shrinkage Tin Cure Silicone Rubber 25 Shore A RTV-2 Liquid for Sculpture Molds

This low-shrinkage 25 Shore A tin cure (condensation-cure) RTV-2 liquid silicone rubber is a two-component mold-making silicone supplied as HN-625 in the HN-6XX series. Mixed at a simple 100:2 ratio by weight and cured at room temperature, it forms a flexible yet tough elastomer with no oil bleed, exceptional detail reproduction, high tear strength and low linear shrinkage (≤0.2%) — a factory-direct solution for sculpture molds, statue and art molds, cement and concrete molds, resin crafts and general RTV-2 mold making.

Key Features

• Low linear shrinkage (≤0.2%) — faithful, dimension-stable reproduction of sculpture and fine-art detail
• Shore A 25±2 hardness (HN-625) — flexible grade with high tear strength for detailed, undercut patterns
• Two-component tin-cure (condensation) RTV-2 system, also called tin catalyzed RTV silicone; 100:2 mix ratio by weight
• Room-temperature curing (no heating required); 30-40 min pot life at 25°C, full cure in 12-24 h
• No oil bleed (non-oily) and excellent pattern detail; easy demolding and multiple demolding cycles
• High tear strength (22.8-26.1 kN/m), tensile strength 3.6-3.9 MPa and elongation 560-630%
• Stable chemical, heat, corrosion and ageing resistance; 12-month shelf life, non-dangerous goods for transport

Typical Applications (Multi-Field Coverage)

• Sculpture molds, statue molds, fine-art and relief molds
• Museum reproduction, architectural ornament and craft figure molds
• Cement wall tile molds, cement wall cladding molds and interior wall tile molds
• Precast concrete molds, decorative concrete casting and construction molds
• 3D decorative wall panel molds and architectural decorative panels
• Cultural stone, artificial stone, terrazzo and cultured marble casting
• GRC / GFRC architectural molds, architectural restoration and brush-on molds
• Gypsum, plaster and handcraft mold making
• Epoxy casting molds and polyester resin molds
• Polyurethane casting, vacuum casting, prototyping and foundry patterns

Technical Data (HN-625, 25 Shore A)

Other hardness grades in the same HN-6XX series (Shore A 5, 10, 15, 20, 30, 35, 40, 45, 50) are available for selection: softer grades for candles, soaps and delicate crafts; medium grades for general crafts, resin and gypsum; harder grades for concrete, cement and rigid molds. All grades share the same 100:2 mix ratio, pot life and cure time.

Mixing & Application

1. Pre-mix Component B (curing agent) well and stir Component A if filler has settled.
2. Weigh Components A and B in a strict 100:2 ratio by weight. Do not under- or over-dose the curing agent.
3. Mix thoroughly, scraping the bottom and walls of the container for full dispersion.
4. Degas under vacuum; do not exceed 10 minutes so pot life is not shortened.
5. Pour or brush onto the master pattern within the 30-40 min pot life, avoiding trapped air.
6. Allow to cure at room temperature for 12-24 h; leave 24 h before demolding for best results. Do not heat to cure (temperature must not exceed 100°C if acceleration is unavoidable).

Why Choose Us

• Factory-direct supplier (Shenzhen Hanast New Materials Co., Ltd., Guangdong, China) with 10+ years of silicone experience
• RTV-2 liquid silicone manufacturer and condensation-cure (tin catalyzed) supplier serving global B2B buyers
• Industrial-grade two-component system with stable batch-to-batch quality for wholesale and mass production
• OEM / ODM custom formulation: custom hardness (Shore A 5-50), color, viscosity and packaging
• Bulk supply capacity of 50 tons per month, export packing and fast lead time
• Free samples for evaluation; full technical data sheet (TDS) and MSDS documentation on request

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: Why is low shrinkage important for sculpture molds?

A: Low linear shrinkage (≤0.2%) means the cured mold keeps the exact dimensions of the sculpture or master pattern, so castings stay true to the original and multiple molds remain consistent. This is essential for fine-art detail, reliefs and dimension-critical reproduction.

2. Q: What is the mix ratio and curing time of this 25 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 sculpture, statue and fine-art molds, museum reproduction, architectural ornaments, cement wall tile molds, precast and decorative concrete, cultural stone, artificial stone, GRC/GFRC molds, gypsum, plaster, epoxy and polyester resin molds, polyurethane/vacuum casting and prototyping. 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 supplier 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.