PBT (Polybutylene Terepthalate)

General Moulding Notes

PBT requires a hot gate area - excessive gate cooling may cause gate freeze-off.
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	No
XS	Extended Sprue	No
NS	Nylon Sprue	Good
NX	Nylon extended sprue	Good
Pin Gate Tips For Gating On Parts
PP	Pinpoint	Good	Gate area must be kept hot.
PX	Pinpoint Extended	No	Gate will freeze-off.
PT	Pinpoint thru' flow	No	Prone to gate freeze-off.
EXT	Extended Hot Pinpoint	Fair	Gives minimal gate pip, no witness ring, high pressure drop.
RG	Ring Gate	Good	Leaves witness ring on part.
RT	Ring Gate thru' flow	No	Prone to gate freeze-off.
CG	Collar Gate	Fair	Prone to gate freeze-off. Gate area must be kept hot.
CT	Collar gate thru' flow	No	Gate will freeze-off.
Valve Gate Tips For Gating On Parts
VP	Valve pinpoint gate	Fair	Gate area must be kept hot. No witness ring on part.
VR	Valve ring gate	Good	Leaves witness ring on part.
VC	Valve collar gate	Poor	Gate area must be kept hot. 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	O	O