Calcium carbonate is one of the lowest price fillers, non-toxic, non-irritating, odorless; white, refractive index and many plasticizers, resins are similar, the coloring interference of PP materials is minimal; dry, does not contain crystalline water, stable in a wide temperature range, decomposed at about 800 ~ 900% C; low hardness, a large number of fillings on the wear strength of the equipment is also small; can improve the plating performance of PP plastic products, printing performance; can neutralize chloride ions, is the ACID receptor in the secondary stabilization of PVC ;PP material can block the generation of smoke when it is burned by heat; when filling PP material, the effect of increasing strength, bending modulus and heat deformation temperature is not as good as talc and asbestos, but it will make the filled PP material have better impact resistance.
This white PP granule
Calcium carbonate filled PP materials are also insufficient, such as the action of acids to release carbon dioxide, and the formation of soluble salts, so that the acid resistance of filled PP materials is affected. If the resin can fully wet the calcium carbonate particles, the filled PP plastic will also have good acid resistance; due to the moisture content, it needs to be dried in advance for the modification of plastics that are sensitive to moisture and heat.
Is PP material toxic?
Pp material itself is non-toxic, generally with its direct blowing products are also non-toxic, but its injection, extrusion, molding plastic products, such as pots, boxes, shelves contain a large number of fillers, pigments, plasticizers, anti-aging agents and other chemical components, so some of the claimed pp material products are toxic. However, the regular tableware products we usually use have national inspection standards and norms, so they are non-toxic. So try to buy regular products.
pp Material Selection Guide
1. Raw materials. PP material products are generally pp materials, but many of the declared PP materials are not pure PP, so it is necessary to pay attention to when purchasing, and food-grade PP materials that are harmless to the human body are the best.
2. Appearance. Good pp materials are generally transparent or translucent materials, the appearance is shiny, the design is beautiful, there is no burr, which can be seen through the appearance.
3. Durability. Heat resistance is the high-quality characteristics of pp materials, good pp material heat resistance is very high-quality, in high-temperature water will not be deformed, can even be placed in boiling water disinfection. In addition, the impact resistance of pp material is also very high-quality, and it is not easy to break when pressed or impacted, and it will not leave scratches.
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