PC/ABS Molding Defects: How to Prevent Silver Streaks, Warpage and Poor Surface Finish
Solve common PC/ABS injection molding defects, including silver streaks, warpage and poor surface finish. Use this practical resin and process checklist.
1. Silver Streaks and Splay Marks
- Resin moisture condition before processing
- Drying method and dryer performance
- Hopper exposure time
- Regrind control
- Contamination in the feed system
- Excessive shear or unsuitable barrel-temperature settings
2. Warpage and Dimensional Instability
- Wall-thickness variation
- Gate position and flow direction
- Mold-temperature consistency
- Cooling time
- Packing pressure and holding time
- Fibre, filler or regrind content where applicable
- Grade-specific shrinkage information
3. Poor Surface Gloss or Flow Marks
- Mold-surface condition
- Melt temperature outside the recommended window
- Mold temperature that is too low or inconsistent
- Incomplete venting
- Long flow paths
- Moisture or contamination
- A grade mismatch between the material and the appearance requirement
4. Brittle Parts or Low Impact Performance
- Excessive residence time
- Material degradation caused by unsuitable processing conditions
- Incorrect use of regrind
- Storage or handling issues
- Grade selection that does not match the impact requirement
- Test-method differences between supplier data and your own test
5. Colour Variation Between Batches
- Approved colour standard or master sample
- Batch traceability
- Inspection method
- Acceptable colour tolerance
- Packaging and storage requirements
- Whether a colour-matching approval is needed before bulk production
A Pre-Order Checklist for PC/ABS Buyers
- Current TDS, COA and SDS
- Exact grade name and manufacturer identification
- Processing guidance for the proposed grade
- Colour and appearance specification
- Flame-retardancy documentation where required
- Packaging details and batch traceability
- A sample for production testing