Quality Control

Repeated testing on various stages of every batch throughout the manufacturing process enables us to ensure quality and safety of our products. On average, a batch is tested six times. Every week our Technical staff in our full-scale quality control laboratory perform as many as 1,000 tests on raw materials, in-process product batches, and finished product.Arising in Industry :

• Lumps Too Fine :  Plasters will create lumps during paste preparation.
• Inconsistency :   Inconsistency of plaster setting time.
• Lower productivity and inconsistent quality of molds.
• Fragile Molds :   Low bending strength plasters will produce molds that do not resist tough handling by workers.
• Short Mold Life :   Low mechanical strength plasters yield too low mold surface hardness.
• Cracks :   Plaster that expands or shrinks too much will make cracks on surface.
• Fast Setting Time :   Too Fast Setting Time of Plaster : means not enough time to release bubbles, which results in lower strength, so risks of breakage during the handling of molds.
• Long Drying Time :   Plaster with bad porosity will bring too long drying time of molds after usage.
• Surface Problems :   Hard particles in plaster will destroy surface of your product.
• High Iron Content :  Plaster will create black spots on clay ware.
• Set Plaster Lumps :  Plaster badly protected from moisture will have lumps that will destroy surface of clay ware.

Quality Parameters that We Consider Are :

• Plaster water ratio
• Initial Setting Time
• Final Setting time
• % Rise in temperature
• M.O.R
• Acid Insoluble
• Porosity
• Silica Content
• Iron Content
• 1 hour kg/cm2
• Combined Water ratio