(1) Benchmark Your Current Grade
Collect a single-page baseline: resin grade (e.g., SG5/SG7), current stabilizer & dosage, internal/external lubricant system, typical melt temperature, screw/line speed, torque curve, and problem spots (die-lip build-up, kick-off yellowing, odor). Tip: Run a Congo-red and torque test to set numerical targets.
(2) Pick the Right Ca-Zn Family
Not all Ca-Zn packs behave the same. For rigid pipe/profile, choose variants designed for smooth torque and low plate-out; for sheet/film, prioritize clarity and low haze.
→ Explore: [Ca-Zn PVC Stabilizers]([INTERNAL LINK to your Stabilizers category]).
(3) Start with Equivalent Heat Stability
Match the lab heat-stability window first, then fine-tune lubricants. Initial dosage is typically close to the lead system (e.g., 0.8–1.5 phr for rigid applications), but confirm with your supplier.
(4) Tune the Lubrication Balance
Early plate-out is often a lubrication mismatch. Adjust internal/external lubricants in small steps while watching torque and surface appearance. Aim for a flat torque curve over the steady-state segment.
(5) Control Start-Up & Kick-Off
Most yellowing happens during start-up. Use a kick-off stabilizer pack or pre-heat protocol; avoid temperature overshoot at the die.
(6) Validate On Line
Lock settings with a short DOE (design of experiments): vary melt temperature ±5–10 °C and screw speed ±10% to map robustness. Record die-clean interval and any visible build-up as a quality KPI.
(7) Compliance & Documentation
Request REACH/RoHS and food-contact paperwork for the selected grade. Keep them with batch records.
Key Takeaways
· Match heat stability first, then refine lubricants.
· Watch torque shape, not only the end-point.
· Plan for start-up—most plate-out begins there.
Internal Links
Mini-FAQ
Q: Will I need new hardware?
A: Usually no; we tune the processing window and dosage.
Q: Can I get food-contact options?
A: Yes—documentation pack available on request.
