Polyethylene terephthalate (PET) is a type of semi-aromatic Polyester. PET plastic is a thermoplastic commonly known under the brand name Ertalyte®. It is a naturally colourless and semi-cristalline material.

+ values referring to dry material ++ values referring to material in equilibrium with the standard atmosphere 23°C / 50% RH (mostly derived from literature)

PET is also known as polyester or polyethylene terephthalate. It is a thermoplastic commonly known under the brand name Ertalyte®. It is a naturally colourless and semi-cristalline material and has very good machinability.

Typical Components & Applications: Base plates | Structural | Gears | Distribution valves | Friction strips | Dynamic seals | Bushes | Packaging machinery parts | Bearing | Rollers | Manifolds | Cases & covers | Switches | Insulation panes | Handles | Housings for appliances

Here are the properties for TECADUR PET natural and Ertalyte® which are unfilled and unmodified PET polyester brands. Reinforced and modified grades will have different properties.

Thermal Properties (The figures gien for these properties are for the most part derived from raw material supplier data and other publications)

It is a tough, dimensionally stable plastic that offers excellent wear resistance and mechanical strength. It is often reinforced with glass fibers or compounded with silicates or graphite in engineering applications to improve strength and rigidity.

Services CNC Machining CNC Milling CNC Turning Design For Manufacture Aluminium Machining Plastic Machining Stainless Steel Machining

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Considering the very low water absorption of Ertalyte, the values for the mechanical and electrical properties of this material can be considered as being practically the same for dry (+) and moisture conditioned (++) test specimens.

Here are some indicative stock sizes/colours for PET in the UK. Please note we do not supply stock material, the information provided is purely for design and research purposes.

Because of the complex nature of our customers’ products, Kaysun typically deals with applications that fall within Classes 101 and 102 for long-life production. Yet, our broad-based experience in custom injection molding makes us the preferred choice for consulting on all projects for which high-quality and high-volume tools are required.

The Plastics Industry Association (formerly known as the Society of Plastics Industry or SPI mold classifications) has mold standards categorized into five classifications to guide quotes and orders into uniform mold class types:

Simply reviewing an injection mold classification chart isn't enough, however, since each mold classification has unique parameters. It’s essential that you partner with a molder that is knowledgeable on these mold standards and the classification spectrum. The molder's guidance can determine the best type of mold that meets your production life, cost and quality objectives.

Find out how tooling design plays an essential role in achieving desired injection molding outcomes – from the different stages of the tooling process to the key components of tooling design – in our whitepaper, Tooling Design for Injection Molding. Click the button below to download your free copy.

* The figures given for the properties of dry material (+) are for the most part average values of tests run on test specimens machined out of rods Ø 40 - 60mm. Except for the hardness tests, the test speciments were then taken from an area mid between centre and outside diameter, with their length in longitudinal direction of the rod (parallel to the extrusion direction).

Experienced injection molders ask questions to better understand your project needs from multiple perspectives: design, purpose and objectives. First to determine overall moldability, and then to confirm the best type of mold. Mold classification helps determine the correct mold type and is crucial to achieving quality, production and cost objectives.

If you are interested in PET machined parts, please scroll to the bottom of the page for more information about our service and to request a quote.

The first step when you approach a custom injection molder to produce complex plastic parts or components is determining if the product is suitable for a streamlined injection molding process

Industry Examples: Instrumentation | Electrical/Electronics | Food technology | Aerospace | Medical | Pharmaceutical | Automotive | Telecommunications

This guide will take you through the main attributes, common applications, notes for designers and suitable finishing and treatments, as well as UK stock sizes and property tables. Don't forget to bookmark the page so you can refer back later.