Custom OEM Food Grade Dual Cure Platinum Silicone Rubber 1:1 Mixing Ratio 40 Shore A for Architectural Concrete Molding

Food Grade Dual Cure Platinum Silicone Rubber for Architectural Concrete Molding

Hanast manufactures a food grade platinum silicone rubber with a dual curing mode, engineered for architectural concrete molding, GRC and concrete casting. With a simple 1:1 mixing ratio and both room-temperature and heat-accelerated curing, it delivers flexible production scheduling with accurate, durable and dimensionally stable molds. Supplied as model HN-E640 (40 Shore A) with full custom OEM/ODM and wholesale manufacturing support.

Key Features

• Dual Curing Mode – cures at room temperature (3-4 h) or accelerates to about 20 minutes at 80-100°C for fast turnaround and flexible scheduling.
• Food Grade & Safe – FDA compliant, odourless and non-toxic, suitable for food-contact molding.
• 1:1 Easy Mixing Ratio – equal-part A:B by weight greatly reduces operator error.
• RTV-2 Addition Cure (Platinum) – no by-products and very low shrinkage (≤0.1%) for faithful detail reproduction.
• Architectural Performance – good tear strength (14 kN/m) and high tensile strength for large concrete and GRC molds with long mold life.
• RoHS & REACH Compliant – with MSDS and TDS documentation, suitable for export markets.
• Custom OEM/ODM – customizable hardness (0-60 Shore A), viscosity and colour; private label available.

Technical Specifications (HN-E640, 40 Shore A)

Recommended Applications

• Architectural concrete and GRC molding
• Precast concrete panels and decorative facades
• Cultural stone, artificial stone and terrazzo molds
• 3D wall panels and wall cladding molds
• Concrete countertops, basins and sinks
• Decorative panels, cornices and casting molds
• Food-contact and general-purpose molding
• Plaster, gypsum and cement craft molds
• Resin, epoxy and polyester casting molds
• Architectural restoration, master models and prototypes

Mixing & Application

1. Pre-mix: stir Components A and B thoroughly before use.
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 for bubble-free molds.
5. Pour within the 30-40 min pot life; ensure full coverage of the pattern.
6. Choose cure mode: room temperature 3-4 h, or heat 80-100°C for ≤20 min; demold after full cure.

Wholesale Supply & Packaging

Factory-direct manufacturing from a 40,000 m² production base with 100 tons/month capacity, packed in 20 kg / 25 kg / 200 kg drums with full MSDS and TDS documentation. Custom formulations, private label and bulk wholesale pricing are available; MOQ from 20 kg.

About This Supplier

Shenzhen Hanast New Material Co., Ltd. is a premier high-tech enterprise and leading source manufacturer specialising 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 does "dual cure" mean for this platinum silicone rubber?
A: It supports two curing modes: room-temperature cure of 3-4 hours, or heat-accelerated cure of about 20 minutes at 80-100°C. This lets you schedule production flexibly — natural curing for large or on-site molds, and heat acceleration for fast demolding in high-throughput lines. Pot life is 30-40 minutes at 25°C in both cases.
2. Q: Is it suitable for architectural concrete and GRC molding?
A: Yes. The HN-E640 40 Shore A grade combines 6.0 MPa tensile strength, 14 kN/m tear strength and ultra-low shrinkage (≤0.1%), making it ideal for architectural concrete, GRC (glassfiber reinforced concrete), precast panels, cultural stone and decorative molding with accurate reproduction and long mold life.
3. Q: What hardness and viscosity options are available?
A: The HN-E6XX series covers 0-60 Shore A with a shared 1:1 ratio, 30-40 minute pot life and 3-4 hour room-temperature cure. This listing is HN-E640 (40 Shore A, viscosity 6000 ± 500 mPa·s). Custom hardness, viscosity and colour are available for OEM/ODM projects; softer grades suit food, jewellery and delicate crafts, harder grades suit rigid and high-wear molds.
4. Q: How do I prevent platinum catalyst poisoning?
A: Addition-cure (platinum) silicone can be inhibited by organotin compounds, sulfur/polysulfide, amines, polyurethane, phosphorus compounds, organic acids and solder-flux residues. Always use clean, dry substrates, tools and containers, avoid tin-cure silicone residue, and test any colourant or filler before production, as they may deactivate the platinum catalyst.
5. Q: What are the MOQ, packaging, certifications and delivery?
A: MOQ starts at 20 kg; supply ability is 100 tons per month. Standard packaging is 20 kg / 25 kg / 200 kg drums with MSDS and TDS included; shelf life 12 months when stored sealed below 25°C. Certifications: FDA, MSDS, RoHS, REACH. Lead time is about 3-5 days for samples and 10-15 days for bulk/OEM orders — contact us for factory-direct bulk pricing and free samples.