Which plastic should I choose?
There are literally thousands of different plastics and plastic alloys, with more being added to the list monthly. 
Below are a selection of the plastics you will encounter in products you use every day.
Generalised qualities of some plastics?
Acrylonitrile butadiene styrene (ABS)
A polymer of styrene (providing a shiny, impervious surface), polybutadiene (for rubbery toughness), and nitrile monomers (which bind the chains together for additional strength), ABS is commonly used for lightweight injection mouldings such as remote controls, automotive trim, and toys.
* Poor UV-resistance
* Poor stress cracking resistance
* Low water absorption
* Good resistance for diluted acids and bases
* Good oil resistance
* Good scratch resistance
* High surface hardness
* Good impact strength
Polyethylene (PE)
A semi-crystalline thermoplastic with a high degree of toughness and very good chemical resistance. When compared to other plastics, it exhibits low mechanical strength and temperature resistance, however this can be improved by using grades with higher molecular weights. Primarily used in packaging, it is also used in varying grades for piping, chopping boards and even knee replacements.
* Low density compared to other materials
* High impact resistance, even at low temperatures
* Good resistance to wear
* Minimal moisture absorption
* Excellent chemical resistance
* High corrosion resistance
* Non-stick
Polypropylene (PP)
Another semi-crystalline thermoplastic, which resembles HDPE, but exhibits higher strength, rigidity and hardness. PP is, however, sensitive to impact at temperatures below freezing point. The chemical resistance is comparable to PE. PP is widely used in applications from flip-top bottle caps, furniture, rebar supports, and alternatives to laboratory glassware.
* Low density compared to other materials
* Minimal moisture absorption
* Excellent chemical resistance, even to solvents (but this means labels may not adhere to it)
* Highly corrosion resistant
* Relatively high superficial hardness
Nylon 6
Although Nylon was originally developed as an alternative to silk, modern grades of nylon are extremely versatile and can be used in engineering applications such as gears, engine fittings, and even toothbrush bristles. Other grades of Nylon (Nylon 12) are used in cosmetics and sports apparel.
* Balanced toughness and rigidity
* Capacity for hardness level adjustment
* Extremely high impact strength, also down to -40°C
* Good abrasion and wear resistance
* High energy and shock absorption
* No brittle fractures under pressure or impact loads
* Extreme wall thickness variations can be realized in the moulded component
* Ready integration of inserts and reinforcement materials and fillers
For help in readying your design for manufacture, and ensuring that your materials selections are optimal, contact Sated Design and discuss your project with us.
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