FAQs
What is food grade plastic?
Food grade plastic has been specifically manufactured to be safe for contact with anything that could be consumed by humans or animals. This means that it doesn’t contain any dyes or similar ingredients which could be harmful to humans, and it hasn’t been in contact with any harmful chemicals during the raw plastic manufacturing process.
Which plastics are FDA approved?
Most grades of PE, Cast Nylon grade MC – FOOD (Comco-PA6C FOOD) and POM-C grade POM-C-NAT (Comco POM-C).
Which plastics have a low coefficient of friction?
A number of different plastics generally perform well in friction and wear applications and are often used in bearings, bushings, gears, and chain guides. These materials include:
PTFE
PE
Nylon
Acetal
PET (semicrystalline)
Which plastics offer high tensile strength?
Nylon has a tensile strength of 85 N/mm². This high tensile strength plastic can often be overlooked but it has a relatively high melting point (232ºC) and exhibits excellent abrasion resistance.
What’s the difference between crystalline and amorphous plastics?
Crystalline plastics are plastics that have a regular arrangement of macromolecules inside with a clear melting point. Regularly arranged regions are called crystal regions, and disorderly arranged regions are called amorphous regions. The percentage of crystal regions is called crystallinity. Generally, polymers with crystallinity above 80% are called crystalline plastics.
Common crystalline plastics are:
Polyethylene PE, polyamide PA6 (Nylon 6), polyamide PA66 (Nylon 66), polyethylene terephthalate PET, Polyoxymethylene POM, etc.
Common non-crystalline plastics are:
Polycarbonate PC, modified polyphenylene ether PPE, etc.
What is the difference between cast and extruded plastic?
Extrusion is the process where a plastic resin is forced through a shaped metal piece or die to produce a continuous rod, tube or sheet of the formed product. Extrusion enables materials to have very small diameters or thicknesses.
Casting is the manufacturing process where a mould is filled with liquid synthetic resin, which then hardens. Casting generally produces larger scale products to a higher standard.
What type of Nylon do I need?
While Nylon 6 & 66 are very similar materials, they have different characteristics due to their differences in chemical structure. Their main points of difference are on the grounds of mould shrinkage, water absorption rates and deflection temperatures. For example, Nylon 6 absorbs more water than Nylon 66 and holds lower heat deflection temperatures.
Can PSR make design drawings for me?
Yes, we can. You are also able to submit your own 2D and 3D CAD drawings.
Do PSR offer design advice?
Yes, we do. We’re always on hand to offer our support on design or material selection for your component or application.
How can I get a quote?
Simply use our convenient inquiry form. There you can simply upload the 3D data (.stp/.step) of your parts along with the technical drawings, materials and other relevant information.
How quickly can you quote for fabricated items?
With our computerised estimating/quoting system this can usually be provided within hours of your enquiry.
I don't have 3D data. Can I still get a quote?
Of course, you can also get a quote with technical drawings only.