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Considerations of injection mould material changing

Considerations of injection mould material changing
Issue Time:2017-10-20
With any injection mould material change there is much to consider besides just the cost. 

Operating Environment: 
What is the average operating temperature? 
Material RTI value is critical for this 
What is the peak operating temperature? 
HDT is probably the most critical value 
Is it wet or extremely dry? 
Water Absorption rates can have an impact on mechanicals. Nylons have some of the highest rates. 
Is it exposed to chemicals? 
Chemical compatibility specifications must be considered 

Mechanical: 
Is it under any kind of constant external stress 
Creep values must be considered 
Does it have to sustain and kind of impact 
Impact strength is a critical value 
Filled materials generally have lower impact values than non-filled materials 
Manufacturing process 
Some processes naturally lend themselves to more mechanically robust plastic parts. Mostly due lower internal stress levels within the component itself. An example would be compression molding versus plastic  injection molding

Other: 
Flammability Requirements? 
5VA, 5VB, V0, V1, V2 or HB? 
Dielectric Strength 
I believe you are probably aware of this requirement as it is an electrical connector you are speaking about 

Environmental: 
Is your company under any kind of environmental restrictions with regards to the products you sell like RoHS, Blue Angle or any of the EU Environmental requirements? 
The flame packages in these injection mould materials may or may not be compliant with these and other environmental restrictions (Like Halogenated/Brominated flames packages). 
The environmental agencies vary in their restrictions and a thorough evaluation of each is required in order to insure you do not conflict with them in your material selection. 

This may seem like a lot to consider, and it is, but as an old mentor of mine use to tell me "It is better to make sure you cover all your bases than to be celebrating at home plate only to realize you just made an out."

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