XPS screw barrel tuned for B1-class flame-retardant XPS compound duty. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
B1 flame-retardant packages are corrosive and abrasive at once — they attack a nitrided bore from both directions. Our B1-duty sets use corrosion-resistant barrel linings and a screw profile that keeps the retardant dispersed without overheating it.
Built for producers moving to B1-classified board for export and code compliance. Tell us the retardant system and line and we quote the matched set.
Quote within one business day. We reply with a matching proposal, delivery date and price — no generic catalogue PDF.
Standard range shown. Every dimension below can be changed to your machine, resin and output — custom manufacturing is our daily business.
| Screw diameter | Ø90–250 mm typical |
|---|---|
| Compound | B1 flame-retardant XPS |
| Barrel | Corrosion-resistant lining (standard for B1) |
| Design | Dispersive profile, temperature-safe metering |
| Certification | Board B1 classification per your lab |
| Lead time | 40–55 days |
The honest answer depends on your resin, not on price. Here is how we advise customers.
| Gas Nitrided (38CrMoAlA) | Bimetallic Alloy Lining | |
|---|---|---|
| Best for | Unfilled PE, PP, PS, ABS, virgin PVC | Glass-filled, mineral-filled, recycled, corrosive |
| Surface hardness | HV 900–1020, depth 0.45–0.7 mm | Alloy layer 2–5 mm, metallurgically bonded |
| Typical service life | Baseline | 3–5× baseline on abrasive resin |
| Cost | Lower | Higher, recovered through fewer stoppages |
| Certification | MTC with heat number | MTC + hardness records, third-party on request |
Halogenated retardants release corrosive species at temperature, and the additive package is abrasive — a double attack that nitrided steel loses. A corrosion-resistant lining is the standard answer.
It needs gentler, longer mixing — the profile differs from standard XPS duty to keep cells fine and classification stable.
Yes with the right screw; we will ask about your changeover practice when sizing.
Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
