Desiccant Masterbatch — Bubbles, Streaks, or Splay When Processing Regrind or Wet Resin

1. Problem

Regrind or hygroscopic-contaminated resin produces bubbles, silver streaks, or splay marks in the finished part, and drying is not practical or sufficient.

2. Symptoms

• Silver streaks or splay on injection-molded parts
• Bubbles or fisheyes in extruded film
• Surface defects on blow-molded parts running regrind
• Frothing at the die

3. Investigation (Before Prescribing an Additive)

Before recommending any Masterbatch, work through these checks:

• Confirm root cause is moisture — not shear degradation, contamination, or entrapped air.
• Check whether the resin should be dried instead — desiccant Masterbatch is a scavenger, not a substitute for proper drying of hygroscopic resins like PET, PA, PC.
• Determine regrind %, storage conditions, and ambient humidity.
• Confirm regulatory environment.

Not every symptom needs an additive — sometimes the correct answer is a resin change, a process change, or drying. Investigation prevents wasted spend on a Masterbatch that does not fix the true root cause.

4. Candidate Masterbatch Family

One family commonly evaluated is Desiccant Masterbatch — typically calcium-oxide-based scavengers that chemically bind residual moisture during processing. It is not a universal fix for wet plastic; it is appropriate for regrind and moderately damp non-engineering resins. Engineering resins (PET, PA, PC) still require proper drying.

This page does not prescribe a specific SKU. Grade selection depends on the RFQ Mini Technical Specification at the bottom.

5. Polymer Considerations

Compatible with polyolefins and styrenics. Not intended for hygroscopic engineering resins that require desiccant drying, not desiccant Masterbatch.

For polymer-specific carrier compatibility, see Wave 8 — Polymer × Masterbatch.

6. Application Examples

Common applications where this problem appears:

• Regrind streams in film and injection (Wave 10 Film / Injection)
• Recycled polyolefin blow molding (Wave 10 Blow / Bottle)
• Sheet extrusion running wet regrind (Wave 10 Sheet)

7. RFQ Mini Technical Specification (9 Fields)

Under Application-First Selling v1.0 and Problem-First Discovery v1.0, an RFQ from this page should include every field below so the supplier can respond without a clarifying round-trip:

1. Polymer — grade + MFI
2. Indoor / Outdoor service — service environment
3. UV exposure — region (kLy/year), hours/day, expected years
4. Processing method — film, injection, blow, pipe, sheet, raffia
5. Color target — color family + Pantone/RAL if applicable
6. Thickness / gauge / wall — µm or mm
7. Expected lifetime — months or years
8. Regulatory requirements — FDA, EU 10/2011, NSF-61, REACH, RoHS, UL, or industry-specific
9. Annual volume — kg or MT/year

Continue Your Path

• Understand the engineering → Wave 2 — Color Masterbatch Explained
• Match by polymer → Wave 8 — Polymer × Masterbatch
• Match by application → Wave 10 — Application × Masterbatch
• Prepare specifications → use the 9-field checklist above
• Submit RFQ → /quote

Allzone supplies industrial Masterbatch across North America. We do not publish inventory or lead-time claims on knowledge pages. Submit an RFQ with the 9 fields above for a technical response.