| Flashing | |
| Possible Cause | Suggested Remedy |
| Material too hot | a. Decrease melt temperature b. Decrease mould temperature c. Lengthen cycle time |
| Injection pressure too high | a. Decrease injection pressure b. Decrease boost time c. Decrease injection rate d. Increase transfer position (to lower injection peak pressure) |
| Excessive packing of material in cavities | Decrease packing pressure |
| Projected area too large for available clamping force | Use larger tonnage machine |
| Mould clamping pressure not properly adjusted | a. Increase clamping pressure b. Check mould parting line for obstruction c. Check platen parallelism |
| Uneven or poor parting line and mating surfaces | a. Remove mould, carefully inspect and repair parting lines, cavities and cores which do not have positive shut off b. Add support for mould cores and cavities |
| Non-uniform cavity pressure due to unbalanced filling | a. Balance/increase runner and gate sizes to obtain uniform filling b. Properly balance cavity layout for maintaining uniform cavity pressure |