Precipitated Calcium Carbonate for Rubber Compounds

At EZ Chemical we supply precipitated calcium carbonate for the rubber industry in two grades, PCC-EZR01 and PCC-EZR02. The product page states that both grades use high-quality limestone and low-sulfur coal, together with advanced production technology and on-site management. The page lists high whiteness, few black spots, high brightness and a uniform particle size distribution as the main characteristics. In this article we describe the two grades, the specification table, the role of the product in rubber compounds and the points a buyer should confirm before an order.

Two Grades of Precipitated Calcium Carbonate

PCC-EZR01 is presented as a grade with high whiteness, few black spots, high brightness and a uniform particle size distribution. The page says it gives the finished rubber product an excellent appearance, good toughness and good aging performance. PCC-EZR02 is presented with high whiteness, fewer black spots, low oil absorption value and a uniform particle size distribution. The page says it can improve production and processing efficiency, reduce production cost and give the finished product a good appearance and performance. The two grades are therefore aimed at different balance points, and the choice should follow the rubber compound and the property that the buyer wants to adjust.

Specification Table on the Page

The page gives a detailed table for both grades. PCC-EZR01 has a purity of at least 98.0 percent as CaCO3, acid insoluble matter of no more than 0.20 percent, a settlement bulk of 2.8 to 3.5, a loss on drying of no more than 1.5 percent, a pH of 9.0 to 10.0 in a 10 percent suspension, a whiteness of at least 94.0, heavy metal of no more than 0.002 percent, Fe of no more than 0.05 percent, a DOP absorption of no more than 65 g per 100 g, black spots of no more than 5 per gram, a sieve residue of no more than 0.005 percent on 125 micrometers and no more than 0.4 percent on 45 micrometers. PCC-EZR02 has a purity of at least 97.0 percent, a settlement bulk of 2.4 to 2.8, a loss on drying of no more than 1.0 percent, a pH of 9.0 to 10.5, a whiteness of at least 92.0 and a DOP absorption of no more than 55 g per 100 g, with the other limits the same as the first grade.

Function in Rubber Compounds

In rubber, a mineral filler affects the appearance, the hardness, the processing behavior and the cost of the compound. The page presents this precipitated calcium carbonate as a product that can give the finished rubber a good appearance, good toughness and good aging performance, and it presents the second grade as a way to improve processing efficiency and reduce cost. The buyer should confirm the loading level, the mixing sequence and the compatibility with the other fillers and the curing system. A small trial batch is the practical way to check dispersion, surface appearance and mechanical properties before a bulk order, because the page gives the product specification but not a compound recipe.

Quality Control and Buyer Checklist

The page lists the controlled items as purity, acid insoluble matter, settlement bulk, loss on drying, pH, whiteness, heavy metal, Fe, DOP absorption, black spots and sieve residue. These are the points to repeat in the incoming inspection. Before an order, the buyer should confirm the grade, the packing, the quantity, the whiteness requirement, the oil absorption limit, the sieve specification and the delivery destination. The page does not list a price, a minimum order quantity or a delivery lead time, so those points should be requested with a quotation. A certificate of analysis for the actual production batch should be requested with the shipment, and the sample should be kept for comparison with the next lot.

Contact and Order Confirmation

The contact details shown on the page are email kevin_song@ezchemical.cn, telephone 86-0571-6471 0226 and mobile +86-13858035754. The company address is Room 2008, Building 8, Jinse Yangguang, Xin'an East Road, Xin'anjiang Street, Jiande City, Zhejiang Province, China. EZ Chemical presents itself as a supplier of calcium carbonate series products, including precipitated calcium carbonate, ground calcium carbonate, nano calcium carbonate, calcium oxide, calcium hydroxide and plastic masterbatch. A buyer can review the full range and confirm the grade and the packing for a mixed order.

The two grades described above are both intended for rubber applications, and the final selection should be based on the rubber type, the required whiteness, the oil absorption limit and the processing method. The page facts give a clear specification table, and the buyer should use that table together with a sample test and a batch certificate before the order is placed.