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What Material Is Best For You?
Please see below a list of materials that we work with below. With our experience and expertise, we will help you pick out whats best for you.
Machining of plastics can be advantageous for applications requiring low volume production, close tolerance dimensions and/or difficult to mould configurations.
There is an array of plastics to choose from; highly engineered, high performance products to low cost, low performance. Determining which is appropriate for a particular application can be challenging.
Typically, our engineers will require 3 or less characteristics that are critical to the functionality of the component. We will priorities these and look for a material that can supply all three. The below list presents only the most common machined plastics.
- Clear Plastics
- Loading Strength (psi)
- Temperature Resistance
- Limiting PV
- Dimensional Stability
- Chemical Resistance
- Toughness/Impact resistance
- UV Resistance
Stock shapes are typically clear but once machined they become translucent to opaque. Polishing is required to return the component to clear. Polishing methods are direct machine polish, flame polish, and buffing.
Good Choices: Acrylic, Polycarbonate and PETG,
Tensile strength (plastic in tension) and compression strength (plastic under compression) are important values for structural applications.
Good Choices: Peek, PPS, Nylon, Delrin
Poor Choices: Teflon, UHMW, LDPE, HDPE, Polypropylene
Consider either continuous service temperature in air or heat deflection temperature if under load.
Good Choices: PTFE, PEEK, Torlon, PPS
Poor Choices: Acrylic, UHMW, ABS, PVC
A combination of pressure and velocity that determines whether a plastic material has enough thermal and structural ability to withstand a bearing application in rotational wear.
Good Choices: Peek, Nylatron, Delrin AF, Torlon 4301
Poor Choices: UHMW, PBT, PETG Nylon
Machined plastics do not have the structural stability of metals. This is primarily caused by their tendency to absorb water and a high coefficient of thermal expansion. Stable materials have low water absorption with a low CTFE.
Good Choices:Peek, PPS, PETG
Poor Choices: Nylon, UHMW, HDPE, LDPE
Chemical resistance of plastics is variable. Some materials show an almost universal resistance to chemicals while others are very sensitive and stress crack when exposed. Best practice is to consult a reference guide for a specific chemical/plastic interaction.
Good Choices: Teflon, UHMW, CTFE, PEEK
Poor Choices: Acrylic, ABS, Noryl, Polysulfone
A measurement of a plastics ability to withstand a sudden shock or a blow. Do not confuse this with resistance to steady state stress where failure can occur from chemical attack or configuration stress risers. Polycarbonate can tolerate high impact but stress cracks from steady loading.
Good Choices: Nylon, Polycarbonate, UHMW, Peek
Poor Choices: PETG, Acrylic, Polyphenylene
General measure of cost of the material. Higher performance engineered plastics are more expensive.
Inexpensive Choices: Delrin, UHMW, Polypropylene, HDPE
Expensive Choices: Peek, Vespel, PPS, Radel HDPE
Suitability for use in medical device applications. Plastics carry the USP class VI designation.
Good Choices: Polycarbonate, Peek, UHMW, Radel
The Food and Drug administrations’ classification for plastics which contact food.
Good Choices: Delrin, PETG, Polycarbonate (some grades, S&D are one of the few comapnies that stock food grade polycarbonate), Peek.
Resistance to UV typically seen in outdoor use. Plastics without resistance will age and become brittle. Because of the coloring, most black plastics have at least a small amount of resistance.
Good Choices: Ultem, Polycarbonate (UV stabilized grade only, non FDA), PBT
Poor Choices: Polycarbonate (FDA), Nylon, Acetal
Answers to Your Questions.
What are your opening times?
Our opening times are:
Monday : 8:30 am – 4:45 pm
Tuesday : 8:30 am – 4:45 pm
Wednesday : 8:30 am – 4:45 pm
Thursday : 8:30 am – 4:45 pm
Friday : 8:30 am – 12:30 pm