GRG Architectural Gypsum with Hardness of 8.5MPa, Whiteness of 96, Free of Impurities and Bubbles, High Hardness – Detailed Introduction

GRG (Glassfiber Reinforced Gypsum) is a composite material made from high-strength gypsum as the base and reinforced with glass fibers. Below is a detailed analysis of the characteristics you described: hardness of 8.5MPa, whiteness of 96, no impurities or bubbles, and high hardness.

1. Key Features

• High Hardness (8.5MPa)

• Flexural strength reaches 8.5MPa, far exceeding ordinary gypsum (typically 2-4MPa) and approaching low-grade cement strength. Suitable for load-bearing structures or high-traffic areas (e.g., walls, decorative components).

• The high hardness comes from the dense crystal structure of α-type high-strength gypsum (α-hemihydrate) or formula optimization (e.g., mineral admixtures, polymer modification).

• Ultra-High Whiteness (96%)

• A whiteness of 96 is top-tier (ordinary gypsum whiteness is around 80-90), making it ideal for high-end decoration (e.g., art reliefs, minimalist spaces) without requiring additional coatings.

• Key factors: Selection of high-purity gypsum ore (CaSO₄·2H₂O) and strict control of calcination to avoid carbonization-induced yellowing.

• No Impurities or Bubbles

• Raw materials undergo fine filtration and iron removal to eliminate black spots and mineral impurities. Production uses vacuum mixing or defoaming processes to prevent pores, ensuring a smooth surface suitable for fine processing (e.g., spraying, plating).

2. Typical Applications

• High-End Decoration

• Museum/hotel feature walls, European-style carved capitals, translucent stone lamps—leveraging its high whiteness and moldability for intricate designs.

• Functional Structures

• Fireproof partitions (GB/T 9775-2008 Class A fire rating), acoustic diffusers (high density reduces sound dissipation), with 8.5MPa hardness ensuring durability.

• Custom Products

• 3D-printed architectural components (requires good fluidity and fast curing), medical cleanroom panels (bubble-free surfaces inhibit bacterial adhesion).

3. Manufacturing & Quality Control

• Raw Materials

• Gypsum powder: ≥95% α-hemihydrate content, concentrated particle size distribution (D50 ~30μm).

• Glass fiber: Alkali-resistant chopped strands (6-12mm length, 1.5-3% dosage) to enhance crack resistance.

• Production Process

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• Critical controls: Stirring vacuum ≥ -0.08MPa, curing at 50±2°C (prevents β-crystal formation, which reduces strength).

4. Comparison with Other Materials

Advantages: Lighter and more moldable than cement; 20%+ stronger than standard GRG with superior visual purity.

5. Key Considerations

• Installation:

• Use gypsum-based adhesives (e.g., quick-setting powder + glue) to prevent electrochemical corrosion from direct metal framework contact.

• Joints should be filled with micro-expansion joint gypsum to avoid drying cracks.

• Maintenance:

• Clean with pH-neutral detergents (6-8); strong acids/alkalis may cause surface deterioration.