STORAGE AND HANDLING
• This compound must not be exposed to high temperatures or moisture but in a dry cool place.
• It has shelf life upto 3 months
• If it is exposed to high temperatures during transit it must be used as soon as possible.

PROCESSING METHOD
• COMPRESSION MOULDING – allows the obtention of excellent surface finish with very good
dimensional stability.
• TRANSFER MOULDING – is used for the manufacturer of items with complicated shape and
different wall thickness as well as for inserting sensitive metallic portions at times slightly orientated
items may appear.
Flash formation is lower in this method than in compression moulding.

TROUBLE-SHOOT GUIDE.
MOST COMMON MOULDING DEFECTS, CAUSES AND POSSIBLE SOLUTIONS.
COMPRESSION MOULDING
DEFECTS AND CAUSES POSSIBLE SOLUTIONS.

BLISTERING
1) Undercured moulding a) increase curing time. b) Increase mould temperature.
c) Increase preheating.

2) Overcured surface a) Decrease mould temperature

3) Gas traps within moulding a) Preheat material. b) Introduce a breathe during cycle.

SHORT MOULDINGS
1)Insufficient material quantity a) Increase material quantity.

2) Uneven material distribution a) Adjust material distribution in the mould

3) Press closing speed too slow a) Increase closing speed.

4) Insufficient moulding pressure a) Increase moulding pressure.

5) Material flow too stiff a) Preheat material. b) Use easier flowing material.

6) Mould temperature too high a) Decrease mould temperature.

POROSITY
1) Insufficient material quantity a) Increase material quantity.

2) Material flow too easy a) Use stiffer flower temperature

3) Mould temperature too high a) Reduce mould temperature.

4) Lack of venting on blind ribs a) Install vents or vented injected pins

5) Flash line too tight. a) Increase flash line.

DEFECTS AND CAUSES POSSIBLE SOLUTIONS

DULL FINISH
1) Under cured moulding a) Increase curing time.

2) Lack of moulding pressure due a) Increase material quantity.
to insufficient material quantity

3) Poor finish on mould a) Polish mould. b) Chromium plate mould.

ROUGH, UNEVEN PATCHES
1)Excessive material preheating a) Reduce preheating time.

2) Excessive mould opening on a) Adjust mould opening
breathing

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