PEI (Poly-ether-imide)

General Moulding Notes

PEI requires a warm gate area - excessive gate heat may cause stringing and part surface distortion.
Mid-range gate diameters are generally suitable.
Gate vestige is usually neat, typical height 1/3 - 1/2 of gate diameter.
Filled polymers may require special wear resistant tips - check with factory.

Code	Tip Style	Suitability	Comments
Sprue Tips For Gating On Runners
SS	Short Sprue	Good
XS	Extended Sprue	Good
NS	Nylon Sprue	Fair	May suffer from stringing.
NX	Nylon extended sprue	Fair	May suffer from stringing.
Pin Gate Tips For Gating On Parts
PP	Pinpoint	Good	Gives minimal gate pip, no witness ring.
PX	Pinpoint Extended	No	Gate may freeze.
PT	Pinpoint thru' flow	Fair	As above. Gate pip height may increase, gate may freeze
EXT	Extended Hot Pinpoint	Good	Gives minimal gate pip, no witness ring, high pressure drop.
RG	Ring Gate	Good	Leaves witness ring on part.
RT	Ring Gate thru' flow	Fair	As above. Gate pip height may increase, gate may freeze.
CG	Collar Gate	Good	Gives minimal gate pip, no witness ring.
CT	Collar gate thru' flow	Fair	As above. Gate pip height may increase, gate may freeze.
Valve Gate Tips For Gating On Parts
VP	Valve pinpoint gate	Fair	No witness ring on part.
VR	Valve ring gate	Fair	Leaves witness ring on part.
VC	Valve collar gate	Fair	No witness ring on part
Special Gate Tips For Gating On Parts
MT	Multi-Tip	No	Not Recommended
TG	Tunnel Gate	No	Not Recommended

Find the bush size that most closely matches your required shot weight with your choice of tip and click on the shot weight to be taken to the technical data for that range.
If approaching the maximum for a particular bush size, consider using the next larger size, especially if a long bush is required.
Polymer grade, viscosity, fillers and part dimensions also affect the choice of bush. If in doubt - ask.
O = This tip / bushing combination is not currently available.
X = This selection is not recommended.

Code	Multi-Tips		MT32D	MT45D
MT	Multi-tip Pinpoint		X	X

Code	Tunnel Gate Tips		DT18	DT25	DT32A	DT32C
TG	Tunnel Gate thru' flow		X	X	X	X