25 Shore A 1:1 Mix Ratio Artificial Stone Grade Platinum Cure Liquid Silicone Rubber for Washbasin and Bathtub Molds

Hanast HN-E625 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 25 Shore A the cured rubber delivers 6.0 MPa tensile strength, 24 kN/m tear strength, 520% elongation and linear shrinkage of 0.1% or less, a balance of softness and tear resistance for artificial marble, onyx, engineered stone, solid surface, countertop, washbasin, sink, bathtub and shower tray molds, as well as culture stone, terrazzo, paving, precast and 3D wall panel production.

• Artificial Marble and Solid Surface Grade - 24 kN/m tear strength with 520% elongation releases large cast shapes and undercut edges without tearing, and reproduces veining, gelcoat texture and moulded edges on artificial marble, onyx and solid surface parts.
• Countertop, Washbasin and Bathtub Tooling - low linear shrinkage of 0.1% or less keeps rim profiles, drain positions and panel thickness consistent, so molded sinks and countertops fit standard cabinets and plumbing.
• Engineered Stone and Quartz Look Casting - the rubber holds fine surface detail and sharp edges on engineered stone, quartz-look and terrazzo castings, with release that protects the decorative surface.
• Deep Undercut Release - 520% elongation lets the mold stretch over basin bowls, curved aprons and undercut edges 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 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 4500 +/- 500 mPa.s - good flow into deep bowls and narrow edges, 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.

• Artificial stone products - artificial marble, onyx, engineered stone, quartz-look stone, solid surface, artificial granite and decorative stone panels.
• Sanitary ware and surfaces - countertop, washbasin, sink, bathtub, shower tray, vanity top and integrated basin molds.
• Construction and paving - culture stone, terrazzo, paving slab, precast panel, tactile paving, skirting, wall tile, brick veneer and 3D wall panel molds.
• Furniture and decoration - cast furniture parts, decorative panels, furniture appliques and architectural ornament.
• Art, craft and food contact - sculpture, statue reproduction, 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.