HONG YE SILICONE GRC Mould Making Silicone Rubber is an engineering-grade two-component RTV 2 Silicone Rubber, optimized for precast GRC (Glass Fiber Reinforced Concrete) production and rapid prototyping of architectural components. Available in Condensation Curing Silicone Mold Rubber and Platinum cured mold silicone, this Industrial mold silicone rubber features high tear resistance, concrete adhesion resistance, and extreme weather durability. With adjustable hardness for heavy-duty and fine-texture GRC molds, low shrinkage (<0.15%), and compatibility with precast production lines, it empowers GRC manufacturers to boost mold reuse rates, shorten project lead times, and ensure consistent quality for large-scale construction and landscape projects.
Product Overview
Engineered specifically for the rigorous demands of GRC mold making, this premium Mold Making Silicone solves critical engineering challenges—resistance to concrete’s alkaline properties, durability under repeated casting, and precision in replicating architectural textures. As a two-part flowable liquid (Part A: base silicone; Part B: curing agent), it supports two application methods (pouring for small molds, brushing for large/irregular components) to fit precast factories and on-site fabrication needs. The condensation cure version delivers cost efficiency for standard GRC parts, while the platinum cure variant offers superior chemical resistance and UV stability for outdoor GRC facades and heritage restoration projects, making it the go-to choice for professional GRC fabricators and construction contractors worldwide.
Technical Specifications
Product type: RTV 2 Silicone Rubber, industrial Mold Silicone rubber, Rapid prototyping silicone; Curing systems: Condensation curing (tin-cure), addition curing (platinum-cured); Mixing ratios: Condensation 100:2–3, platinum 1:1/10:1; Hardness range: 20–40 Shore A (20A for fine textures, 30A for standard components, 40A for heavy-duty GRC); Shrinkage rate: ≤0.15% (condensation), ≤0.1% (platinum); Temperature resistance: -50℃ to 300℃; Chemical resistance: Alkali-resistant , oil-resistant, UV-resistant; Curing time: 3–5hrs (demoldable), 24hrs (full cure) at 25℃; Shelf life: 12 months (sealed, dry/cool ≤25℃); Packaging: 1kg/jar, 25kg/drum, 200kg/drum (vacuum-sealed for bulk orders).
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Product Features & Advantages
Alkali-resistant formula withstands GRC concrete’s alkaline environment, preventing mold degradation and extending service life. High tear strength (≥12 N/mm²) handles the weight of wet GRC, avoiding mold tearing during demolding. Dual application methods (brushing/pouring) adapt to small precision molds and large architectural panels alike. Low shrinkage ensures GRC components match design blueprints with zero dimensional deviation. Platinum cured variants offer UV stability, ideal for outdoor GRC products that resist fading and cracking. Non-stick surface enables fast, damage-free demolding, accelerating precast production cycles. Cost-effective condensation cure option reduces mold costs for mass-produced GRC parts.
How to Use the Product
Method 1: Pouring (Small/Flat GRC Molds)
Prepare the prototype and mold frame; seal gaps to prevent leakage.
Mix Part A and curing agent at the recommended ratio; stir for 3 minutes.
Vacuum defoam for 2 minutes, then pour evenly into the frame.
Cure at 25℃ for 3–5hrs, demold, and fully cure for 24hrs before use.
Method 2: Brushing (Large/Irregular GRC Molds)
Apply a thin first coat of mixed silicone to the prototype (covers fine textures).
Sprinkle glass fiber cloth for reinforcement (critical for large molds).
Brush 2–3 more coats (each 1–2mm thick) until desired mold thickness is achieved.
Cure at 25℃ for 4–5hrs, demold, and cure fully for 24hrs before GRC casting.
Application Scenarios
Core applications include precast GRC components (facade panels, cornices, columns), landscape GRC (statues, planters, retaining walls), and heritage restoration (replicating historic stone carvings with GRC). It also suits rapid prototyping of GRC design samples and mass production of municipal GRC facilities. Ideal for precast GRC factories, architectural decoration companies, landscape engineering firms, and heritage restoration teams. This silicone helps buyers cut mold replacement costs by 40%, shorten precast production lead times by 25%, and deliver GRC products that meet strict architectural quality standards.
Certifications and Compliance
Complies with ISO 9001 quality management, CE industrial, and RoHS environmental standards. Platinum cured silicone meets international building material safety regulations for outdoor use. All formulas are alkaline-resistant and conform to global chemical transportation rules, ensuring smooth cross-border bulk procurement for construction projects worldwide.
Customization Options
Hardness customization (20–40 Shore A) for heavy-duty GRC beams or fine-texture carvings. Viscosity adjustment for fast brushing (on-site) or high-flow pouring (precast lines). Curing speed optimization (2–6hrs demoldable) to match project deadlines. Formula modification for extreme alkaline GRC mixes or ultra-large mold fabrication. Bulk packaging customization (200kg drums with pump systems) for precast factory assembly lines.
Production Process
Uses high-purity Silicone raw materials and alkaline-resistant additives; undergoes precise proportioning, closed vacuum mixing (to avoid air bubbles in thick coats), multi-index testing (alkali resistance, tear strength, shrinkage), and automatic sealed packaging. Each batch is tested with GRC concrete samples to ensure compatibility, guaranteeing consistent performance for engineering projects.
FAQ
Q1: Is this silicone compatible with glass fiber in GRC mixes?
A1: Yes, it is specially formulated to be non-reactive with GRC glass fibers, ensuring no mold contamination.
Q2: Can brushed molds be reused for outdoor projects?
A2: Absolutely—platinum cured brushed molds offer UV resistance and can be reused over 200 times for outdoor GRC.
Q3: How to repair a damaged GRC mold?
A3: Mix a small amount of the same silicone and brush it on the damaged area; cure for 24hrs to restore usability.
Q4: Does it work for high-strength GRC concrete?
A4: Yes, the 40 Shore A hardness variant is designed for high-strength GRC’s heavier weight.
Q5: Can it be used for on-site GRC fabrication?
A5: Yes, the low-viscosity brushing formula cures at room temperature, making it perfect for on-site mold making.
Shenzhen Hong Ye Jie Technology Co., Ltd
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