Food Grade 25 Shore A Platinum Cure Liquid Silicone Rubber with 1:1 Mix Ratio for 3D Wall Panel and Concrete Molds

Food Grade 25 Shore A Platinum Cure Liquid Silicone Rubber 1:1 for 3D Wall Panel & Concrete Molds

This 25 Shore A food grade platinum cure (addition-cure) 1:1 liquid silicone rubber is a two-component mold-making silicone supplied as HN-E625 in the HN-E6XX series by a direct China manufacturer, Shenzhen Hanast New Materials Co., Ltd. Mixed at a simple 1:1 ratio by weight and cured at room temperature or by gentle heating, it delivers a tough, high-precision elastomer with excellent physiological inertness, no low-molecule release and ultra-low shrinkage — ideal for 3D decorative wall panels, cement and concrete molds, cultured stone, gypsum and general high-detail RTV-2 mold making, and safe for food-contact molds.

Key Features

• FDA & LFGB food grade — complies with FDA 21 CFR 177.2600 and LFGB; MSDS and RoHS certified
• Shore A 25±2 hardness (HN-E625) — soft-medium grade for construction molds, delicate crafts and high-detail reproduction
• Two-component addition-cure (platinum) RTV-2 system; foolproof 1:1 mix ratio by weight
• Ultra-low linear shrinkage (≤0.1%) for excellent dimensional accuracy on complex geometries
• High tensile strength (6.0 MPa), high tear strength (24 kN/m) and clean demolding for long mold life
• Room-temperature cure (3-4 h at 25°C); heat-accelerated to ≤20 min at 80-100°C for production lines
• Non-toxic, odourless, non-corrosive; no low-molecule release during cure; 30-40 min pot life
• Wide operating temperature range −50°C to 200°C; 12-month shelf life; non-dangerous goods

Typical Applications

• 3D decorative wall panels, wall cladding and architectural mouldings
• Cement and concrete decorative molds; precast concrete and wall tile molds
• GRC / GFRC architectural concrete and cast stone production
• Artificial stone, cultured stone, cultured marble and terrazzo molds
• Gypsum, plaster and cultural stone craft molds; brick carving and sculpture
• Architectural restoration and reproduction; large-format mold making
• Resin, epoxy and polyester casting molds; jewellery and figurine molds
• Food-contact molds (chocolate, candy and baking) — food-grade certified
• Rapid prototyping and precision model reproduction
• Any RTV-2 mold application requiring high precision and easy demolding

Technical Data (HN-E625, 25 Shore A)

Mixing & Application

1. Pre-mix: stir Components A and B thoroughly before use to ensure homogeneity.
2. Weigh A and B at exactly 1:1 by weight using a precision scale.
3. Mix thoroughly for 2-3 minutes, scraping the container walls and bottom.
4. Degas under vacuum to remove entrapped air for bubble-free molds.
5. Pour into the clean, dry mold frame within the 30-40 min pot life.
6. Cure at room temperature for 3-4 h, or heat at 80-100°C for ≤20 min; demold after full cure.

Why Choose Us

• China factory-direct manufacturer (Shenzhen Hanast New Materials Co., Ltd.) with 10+ years of silicone experience
• OEM / ODM custom formulation, private label, custom hardness (Shore A 0-60), colour, viscosity and packing
• FDA & LFGB food-grade certified, with MSDS and RoHS documentation for export compliance
• Bulk wholesale supply and exporter capacity with stable batch-to-batch quality for mass production
• Complete TDS / hardness / viscosity selection guide and technical support
• Free 1 kg samples for evaluation; fast lead time and export packing

About This Supplier

Shenzhen Hanast New Materials Co., Ltd. is a professional manufacturer specialising in the research, development, 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 mix ratio and cure time of this silicone rubber?

A: Mix Component A and Component B at a 1:1 ratio by weight. Pot life is 30-40 minutes at 25°C. It cures in 3-4 hours at room temperature, or in 20 minutes or less at 80-100°C for fast production.

2. Q: Is this silicone suitable for 3D wall panel and concrete molds?

A: Yes. The 25 Shore A (HN-E625) grade has high tear strength (24 kN/m) and ultra-low shrinkage (≤0.1%), making it ideal for 3D decorative wall panels, cement, concrete, GRC/GFRC, cultured stone and gypsum molds with excellent dimensional accuracy and long mold life.

3. Q: Which molds is the 25 Shore A grade best for?

A: The 25 Shore A (HN-E625) soft-medium grade is ideal for 3D wall panels, concrete, cultured stone, gypsum and high-detail craft molds, and is also food-grade for chocolate and candy molds. Softer grades (5-15 Shore A) suit delicate work, while harder grades (35-50 Shore A) suit rigid molds and high-wear parts.

4. Q: What must I avoid to prevent platinum catalyst poisoning?

A: Platinum-cure silicone may fail to cure in contact with organotin compounds, sulfur / polysulfide, amines, polyurethane, phosphorus compounds, organic acids and solder flux. Keep all substrates, tools and containers clean, and never mix with tin-cure silicone residues.

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 3-5 days lead time for samples and 10-15 days for bulk orders. Components A and B are packed in 10/20/25 kg iron or plastic drums, or as 20/40/50 kg kit sets.