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What is mainly formulation components for UPVC pipe?

UPVC pipe, also known as rigid PVC pipe, isan amorphous thermoplastic vinyl chloride resin by 

adding certain additives(such as stabilizers, lubricants, fillers, modifiers, etc.) through extruder 

processing get to plasic pipe

Formulation components

1.PVC resin

In order to obtain rapid and uniformplasticization, should use suspension method loosen pvc resin.

K value of theresin is 66-68.

2.PVC stabilizer

Commonly used lead-based one pack stabilizers,calcium-zinc stabilizers, tin stabilizers

Lead stabilizer have good heatstability,price very cheap, calcium zinc stabilizer is environmentally 

friendlyand non-toxic, tin stabilizer is the best heat stabilizer, environmentallyfriendly and less dosage

3.lubricants

Calcium stearate, stearic acid, paraffinand polyethylene wax are commonly used as internal and

external lubricants.

4.Filler

The filler can improve the performance andreduce the cost. Calcium carbonate can play a skeleton

role in plasticproducts, which has a great effect on the dimensional stability of plasticproducts, can

improve the hardness of products, and can also improve thesurface gloss and smoothness of products.

Usually use GCC,Sometime also mixwith PCC together

5 Modified System

Modification systems often includeprocessing  aid and impact modifier.

The main function of processing aid is topromote the melting of resin and improve the rheological

properties of melt.Because of the entanglement of molecular chains, the elasticity, strength and 

elongation of PVC were improved.

Impact modifier

Because UPVC is a brittle material, theproduct is easy to be damaged under external force, so it is 

necessary to addimpact modifier to improve the impact strength of the product.

6.Coloring system:

Commonly used pigments:

Carbon black, titanium dioxide, ultramarineblue, optical brightener

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