Gypsum Powder (Premium Iranian Casting Grade)

Gypsum Powder (Calcium Sulfate) - Technical Grade

Our technical grade gypsum powder is a fine, high-purity calcium sulfate hemihydrate widely used in industrial and construction applications. It is ideal for mold making, casting, filler use, and as a raw material in cement, plaster, and other building materials.

When to Choose Plaster of Paris Instead: While gypsum is ideal for wall coatings, sculpture bases, and bulk applications, some projects require more precision. Plaster of Paris is a refined form of gypsum that sets quickly and captures fine details, making it perfect for casting, moulding, and model making. If you need a smoother, faster-setting option, check out our Plaster of Paris (Fine Casting Grade).

Benefits & Advantages:

• High Purity: Provides consistent performance in demanding technical applications
• Fast Setting Time: Ideal for molds and casting projects requiring quicker turnaround
• Smooth Finish: Produces sharp details and minimal shrinkage after drying
• Versatile Usage: Suitable for both industrial and hobbyist applications
• Compatible with Additives: Can be mixed with strengthening fibers, pigments, or binders

Common Uses:

• Mold making for ceramics, concrete, soap, and candle projects
• Wall and ceiling plastering in construction work
• Used as a filler or setting agent in building materials and adhesives
• Making decorative architectural elements, such as cornices and trims
• Repairs and patching in drywall and masonry surfaces

Technical Details:

• Chemical Name: Calcium Sulfate Hemihydrate
• Purity: 90-98%
• Color: Off-White (once hardened, slight ivory color)
• Appearance: Fine white powder
• Mesh Size: 200-300 mesh (varies by batch)
• Setting Time: Approx. 20-30 minutes (can vary based on amount of water, temperature/humidity)
• pH (in water): Neutral to mildly acidic

Packaging: Packed in 500g & 1kg

Tips for Best Results

• Always measure by weight, not volume.
• To reduce lumps & bubbles, add gypsum into water.
• Mix gently to avoid trapping air.

Water-to-gypsum Ratio
Consistency Type, Water to : POP Ratio % (by weight)

1. Thick Paste 65g Water : 100g Gypsum (Stronger cast, sets faster)
2. Thin Slurry 75g (max) Water : 100g Gypsum (Easier to pour, weak cast & slow setting)

Store in a dry place away from moisture and humidity