40 Shore A 1:1 Mix Ratio Platinum Cure Liquid Silicone Rubber for Architectural Restoration Grade Molds

Hanast HN-E640 belongs to the HN-E6XX series of two-component, food grade addition-cure (platinum-catalysed) liquid silicone rubbers. Components A and B are mixed 1:1 by weight and cure at room temperature or with heat acceleration. At 40 Shore A the cured rubber delivers 6.0 MPa tensile strength, 14 kN/m tear strength and 450% elongation, a firm mold surface that holds sharp edges on deep relief, undercuts and long narrow profiles. It is used for GRG and GRC panels, cornice and moulding runs, ceiling roses, capitals, balustrades, furniture appliques, heritage restoration work, sculpture, 3D wall panels, gypsum and culture stone masters.

• Architectural Restoration and Ornament Grade - 6.0 MPa tensile strength with 14 kN/m tear strength at 40 Shore A holds sharp arrises and fine leaf detail on cornice, capital, ceiling rose and balustrade molds over repeated demolding.
• GRG and GRC Panel Tooling - linear shrinkage of 0.1% or less keeps panel thickness, rebates and reveal lines consistent, which suits glass fibre reinforced gypsum and cement panel production.
• Heritage and Restoration Projects - the rubber reproduces existing profiles, carvings and ornamental detail from original components, so restorers can cast matching replacement sections in gypsum, plaster, resin or cement.
• Deep Relief and Undercut Release - 450% elongation lets the mold stretch over pronounced undercuts and complex moulding returns without tearing during demolding.
• 1:1 Mix Ratio by Weight - equal-part dosing reduces weighing error and suits both manual batching and meter-mix dispensing equipment.
• Dual Curing Mode - 3-4 h at 25 deg C for large architectural molds, or 20 minutes or less at 80-100 deg C for production lines, with a 30-40 minute pot life for mixing, degassing and pouring.
• Eleven Hardness Grades Shore A 0 to 50 - HN-E600 ultra-soft gel through HN-E650 firm elastomer share the same 1:1 mix ratio, so workshops can tune mold stiffness without changing process.
• Viscosity 6000 +/- 500 mPa.s - good flow into narrow moulding profiles and fine ornament, with easy vacuum degassing and fewer pinholes on the working face.
• Food Grade and Eco Friendly - FDA, MSDS and RoHS certified, odourless, non-toxic and non-corrosive, so the same grade also serves chocolate, candy and baking molds.
• Temperature Resistance -50 deg C to 200 deg C - stable during heat-accelerated cure, in hot workshops and in high-temperature transport.
• No Low-Molecule Release - volume stays unchanged during crosslinking, so master dimensions and mold fit are repeatable batch after batch.
• Platinum Catalyst Poisoning Control - the TDS documents incompatibility with organotin compounds, sulfur and polysulfide compounds, amines, polyurethane, phosphorus compounds, organic acids and solder flux residues, cutting cure failures on site.
• OEM and Private Label Customization - hardness, viscosity, colour, pot life and private label packing available for bulk and wholesale programs.
• Non-Dangerous Transport and Bulk Packing - components packed in 10/20/25 kg iron or plastic drums or 20/40/50 kg kits per set, 50 tons per month capacity, 12 months shelf life, classified as non-dangerous goods for export.

• Architectural ornament - GRG and GRC panels, cornice and moulding runs, ceiling roses, capitals, columns, balustrades, window surrounds, wall panels and 3D wall cladding.
• Heritage and restoration - reproduction of original plasterwork, carvings, statuary and ornamental detail for historic buildings and renovation projects.
• Furniture and interior decoration - appliques, carved components, decorative panels, picture frames and furniture restoration molds.
• Gypsum and cement products - gypsum molds, culture stone, wall tile, brick veneer, terrazzo, paving slab and cement component molds.
• Art, craft and food contact - sculpture, resin and polyester casting, jewelry, candle, soap, wax, life casting, chocolate, candy and baking molds in FDA certified grade.

1. Pre-mix - stir Component A and Component B thoroughly before use to ensure homogeneity.
2. Weighing - accurately weigh A and B in a 1:1 ratio by weight using a precision scale.
3. Mixing - mix for 2-3 minutes until uniform; scrape the container walls and bottom.
4. Degassing - for bubble-free molds, degas under vacuum to remove entrapped air.
5. Pouring - pour into the clean, dry mold frame within the 30-40 minute pot life and ensure full coverage.
6. Curing - cure at 25 deg C for 3-4 h, or heat at 80-100 deg C for 20 minutes or less; demold after full cure.

• For industrial and professional use only. Wear nitrile gloves, safety goggles and protective clothing; avoid skin and eye contact.
• Eye contact: rinse immediately with plenty of clean water for 10-15 minutes and seek medical attention. Skin contact: wipe off with a clean cloth, then wash with soap and water; do not use solvents.
• Ensure adequate ventilation in the work area. Do not ingest.
• Catalyst poisoning warning - this addition-cure platinum silicone may fail to cure in contact with organotin compounds, sulfur and polysulfide compounds, amines, polyurethane, phosphorus compounds, organic acids and solder flux residues. All substrates, tools and containers must be clean and free of these contaminants.
• Do not use with condensation-cure (tin-cure) silicone residues without thorough cleaning.
• Do not add colourants or fillers before testing, as these may disrupt catalyst activity and prevent cure.
• The mixed compound has a 30-40 minute pot life; use promptly and do not return unused mixed material to the original containers.
• Keep containers tightly sealed when not in use and store away from food, children, acids, alkalis and incompatible materials.

Shenzhen Hanast New Materials Co., Ltd. manufactures industrial silicone materials at a 40,000 square metre production base in Guangdong, China, supplying platinum cure liquid silicone rubber to gypsum and plaster factories, culture stone and cast stone producers, wall and floor tile manufacturers, cement component producers, craft mold makers and composite processors worldwide.