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Calcium Carbonate for pvc Pipe

Calcium carbonate improves the base properties of polyvinyl chloride by adding stiffness to the polymer matrix and improving impact resistance as particle sizes become smaller. Calcium carbonate also improves compounding performance by helping disperse various ingredients into the PVC powder blend and improves processing by making polymer flow more homogenous.

The relationship between a calcium carbonate’s particle size and the impact strength of the finished rigid PVC part also applies to extruded pipe and injection-molded fittings. The object is to produce an acceptable part at the lowest possible cost. This is achieved by minimizing the level of ingredients that add cost to the PVC formulation, such as impact modifier.

PVC Pipe

In modern life, we take the long-term performance benefits of PVC pipe for granted. PVC pipe functions without corrosion or leaking and repairs are simple to perform compared to cast iron or copper piping. CMT’s calcium carbonates are certified for plastics piping.

Impact Strength Fundamentals: Particle Size Effect and Impact / Stiffness Balance

Particle Size and Impact Strength

The size of the filler used can have a dramatic effect on the impact strength of a PVC compound. The graph below shows the relationship between impact strength and filler particle size for calcium carbonate in rigid PVC.

The relationship is not linear. When the carbonate size is larger than 1 micron, the impact strength is relatively low. However, as the carbonate size is reduced into the submicron range, the impact strength of the compound increases dramatically.

The low impact strength imparted by particles larger than 1 micron is a function of points of weakness in the polymer matrix. Likewise, the submicron particles impart enhanced impact strength because they are points where stresses can be relieved in the polymer matrix.


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