Choosing a PVC profile additive package means matching stabilizer, processing aid, impact modifier, and lubricant to three variables: climate, color, and wall thickness. White indoor frames need a baseline calcium zinc system; outdoor and cold-climate frames need more impact modifier and weather additives; colored and thin-wall profiles need a tighter lubricant balance. This guide gives you a decision table and the Shitong products that fit each cell.
Start with the base: suspension PVC K-value 65–68 for profiles. Then layer four functions. Heat stability comes from the calcium zinc stabilizer. Fusion and melt strength come from the processing aid. Toughness comes from the acrylate impact modifier. Flow and release come from the lubricant pair. The art is balancing them so no single function is over- or under-served.
Most rejects trace to one of two mistakes: too little impact modifier on thin walls, or a lubricant ratio that fights the stabilizer. Raising impact modifier without more processing aid slows fusion and can swell the melt; over-lubricating hides as a dull surface and die buildup. The package must move as a unit when any input changes.
Your profile | Stabilizer | Processing aid | Impact modifier | Lubricant | Shitong links |
White indoor frame | Baseline CaZn | Standard | 5 phr | G60 + PE wax | |
Outdoor / sunny region | Weather CaZn + TiO2 | Standard+ | 6–8 phr | G60 balance | |
Cold-climate export | CaZn + extra impact | Standard+ | 7–9 phr | G60 balance | |
Colored / foil-coextruded | CaZn | Standard | 5–7 phr | Tight G60/PE | |
Thin-wall / multi-chamber | CaZn | More | 8+ phr | G60 balance | |
Recycled-content blend | Higher CaZn | More | 6–8 phr | Re-balance |
Shitong's application center documents the same package logic across rigid PVC families, and the impact modifier page explains the core-shell mechanism that protects thin walls. Compounders moving to recycled content reported that a higher stabilizer and re-balanced lubricant restored surface quality.
Buyers who adopted Shitong's scenario packages describe fewer seasonal claims — less cracking in winter exports, less chalking on southern-exposure frames. Several formulators said the starting recipe "got them 90% there" and only needed small local tweaks. Aggregate field feedback, not individual testimonials.
Fix the climate and color first, then wall thickness. Validate with a pendulum impact test on the actual chamber, not on a plaque. When you add recycled content, raise stabilizer and re-check the lubricant split before touching impact modifier. Keep batch records so a good run is reproducible.
Calcium Zinc Stabilizer — lead-free, reference 4–6 phr.
ACR Impact Modifier — reference 5–9 phr by scenario.
General Processing Aid — reference 1–2 phr.
Lubricant G60 — reference 0.5–1.5 phr.
Packaging typically 25 kg bags; request REACH/RoHS docs for EU export. Recipe support: cindy@stgaocai.com.
Which additive matters most for cold-climate frames? Impact modifier, followed by a weather-grade stabilizer with TiO2.
Can one package serve white and colored profiles? Not ideally; colored lines need a tighter lubricant balance.
How much recycled content can I add? Often 10–30% with higher stabilizer and re-balanced lubricant; validate impact.
Why re-balance lubricant when changing impact modifier? Different grades fuse differently and shift internal/external demand.
Do I need TiO2 if I use calcium zinc stabilizer? For outdoor frames yes; the stabilizer stops heat damage, TiO2 stops UV chalking.
Where do I get a starting recipe? Shitong supplies formulation support with every order — contact cindy@stgaocai.com.
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