Raw Materials for PVC Pipe & Fittings
Stable extrusion and consistent impact between batches, for pipe and injection-molded fittings.
Common problems
- Impact varies between batches with the same resin and machine
- Surface defects: orange peel, streaking, dull surfaces
- Thermal degradation, black specks or yellowing
- Uneven wall thickness or fluctuating output
Typical formulation
A typical PVC pipe formulation uses K65 resin, a heat stabilizer (CaZn, lead or tin), a lubricant package, filler, TiO2 and, for pipe that needs more toughness, a CPE impact modifier. For injection fittings, K57 resin or a ready-to-process compound flows better in the mold. You can source every one of these components from AstraChem.
Recommended products
Vinora
Suspension PVC homopolymer in four K-value grades, for extrusion, injection, calendering and blow molding.
Calzora
Lead- and barium-free calcium zinc stabilizers, in powder and liquid form for rigid and soft PVC.
Plumbex
Lead-based stabilizers for pipe, roofing, ceiling, gutters, conduit and cable, in low-dust form.
Stannova
Liquid tin stabilizers for pipe, roofing, ceiling, gutters and clear rigid film.
Endura
Three impact modifier types for rigid PVC: ACR for outdoor use, CPE for pipe and conduit, MBS for clear film.
OX 316a
A high-density oxidized polyethylene (OPE) wax with a high melting point. Works as external lubricant and metal release agent, and helps control fusion.
TiO2
Titanium dioxide for opacity and whiteness, plus UV protection in outdoor applications.
Pigments & Optical Brightener
Optical brightener, ultramarine blue and mixed pigments for color matching. Color and whiteness stay on target for your product.
Snowbrite DB
A whitener based on TiO2, optical brightener and ultramarine blue. It offsets the yellow tone of the resin and gives high opacity to white PVC products.
Compora
PVC compound in pellet form for injection and extrusion, from fittings and electrical boxes to cable, jars, gaskets and shoe soles.
Related articles
How to choose the K-value of PVC resin for rigid and soft products
CPE or ACR: choosing an impact modifier for pipe, roofing and gutters
Tin or CaZn stabilizer for clear rigid PVC film
What causes orange peel on PVC pipes, and how to check for it
Lead or CaZn: what to consider before you switch
Uneven ceiling-panel whiteness: common causes and how to check
Seeing a similar problem on your line?
Tell our technical service team what is happening. We discuss it first, then prepare samples for a trial.