PET (Polyester) Plastic Machining

PET UK Stock Sizes

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.

Example PET Stock Sizes

Stock sizes will vary depending on supplier. Please get in contact to discuss further.

PET is typically available in rod and plate form in lengths of 1000mm and 3000mm. 

PET Rod

• From 10mm to 30mm
• Natural / White / Black / Grey

PET Plate

• From 8x500mm to 60x1000mm
• Natural / White / Black / Grey

Please note: some sizes may be non-stocked items and subject to minimum order quantities.

PET Technical Properties

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.

 

TECADUR PET Properties

 

Mechanical Properties	Value	Parameter	Norm	Notes
Modulus of Elasticity (tensile test)	3300 MPa	1mm/min	DIN EN ISO 527-2	For tensile test: specimen type 1b
Tensile Strength	91 MPa	50mm/min	DIN EN ISO 527-2
Tensile Strength at Yield	91 MPa	50mm/min	DIN EN ISO 527-2
Elongation at Yield	4%	50mm/min	DIN EN ISO 527-2
Elongation at Break	14%	50mm/min	DIN EN ISO 527-2
Flexural Strength	134 MPa	2mm/min, 10 N	DIN EN ISO 178	For flexural test: support span 64mm, norm specimen
Modulus of Elasticity (flexural test)	3400 MPa	2mm/min, 10 N	DIN EN ISO 178
Compression Strength	21/38/89 MPa	1% / 2% / 5% 5mm/min, 10 N	EN ISO 604	Specimen 10x10x10mm
Compression Modulus	2800 MPa	5mm/min, 10 N	EN ISO 604	Specimen 10x10x50mm
Impact Strength (Charpy)	150 kJ/m2	max. 7.5J	DIN EN ISO 179-1eU	For Charpy test: support span 64mm, norm specimen
Ball Indentation Hardness	194 MPa		ISO 2039-1	Specimen in 4mm thickness

 

Thermal Properties	Value	Parameter	Norm	Notes
Glass Transition Temperature	81°C		DIN EN ISO 11357	Found in public sources
Melting Temperature	244°C		DIN EN ISO 11357
Service Temperature	170°C	short term		Found in public sources. Individual testing regarding application conditions is mandatory
Service Temperature	110°C	long term
Thermal Expansion (CLTE)	8 10-5 K-1	23-60°C, long	DIN EN ISO 11359-1;2
Thermal Expansion (CLTE)	10 10-5 K-1	23-100°C, long	DIN EN ISO 11359-1;2

 

Electrical Properties	Value	Norm
Specific Surface Resistance	1014 Ω	DIN IEC 60093
Specific Volume Resistance	1014 Ω*cm	DIN IEC 60093

 

Other Properties	Value	Parameter	Norm	Notes
Water Absorption	0.02 / 0.03%	24h / 96h (23°C)	DIN EN ISO 62	Ø ca. 50mm, h=13mm
Resistance to hot water/bases	-		-	Poor resistance
Flammability (UL94)	HB	Corresponding to	DIN IEC 60695-11-10	Corresponding means no listing at UL (yellow card). The information might be taken from resin, stock shape or estimation. Individual testing regarding application conditions is mandatory.
Density	1.39 g/cm3

 

Ertalyte Properties

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

 

General Properties	Value	Test Methods	Notes
Density	1.39 g/cm3	ISO 1183-1
Water absorption after 24/96h of immersion in water of 23°C	6 / 13 mg 0.07 / 0.16%	ISO62	According to method 1 of ISO 62 and done on discs Ø 50mm x 3mm
Water absorptioin at saturaion in air of 23°C / 50 % RH	0.25%
Water absorption at saturation in water of 23°C	0.50%

 

Thermal Properties (The figures gien for these properties are for the most part derived from raw material supplier data and other publications)	Value	Test Methods	Notes
Melting Temperature (DSC, 10°C/min)	245°C	ISO 11357-1/-3
Glass Transition Temperature (DSC, 20°C/min)	-	ISO 11357-1/-2	Values for this property are only given here for amorphous materials and not for semi-crystalline ones
Thermal Conductivity at 23°C	0.29 W/(K.m)	-
Coefficient of linear thermal expansion - average value between 23 and 60°C	60 x 10-6 m/(m.K)	-
Coefficient of linear thermal expansion - average value between 23 and 100°C	80 x 10-6 m/(m.K)	-	+
Temperature of deflection under load: method A: 1.8 MPa	80°C	ISO 75-1/-2
Maximum allowable service temperature in air: for short periods	160°C	-	Only for short time exposure (a few hours) in applications where no ro only a very low load is applied to the material
Maximum allowable service temperature in air: continuiously for 5,000/20,000h	115/100°C	-	Temperature resistance over a period of 5000/2000 hours. After these periods of time, there is a decrease in tensile strength - measured at 23°C - of about 50% as compared with the original value. The temperature values given here are thus based on the thermal-oxidative degredation which takes place and causes a reduction in properties. Note, hwoever, that the maximum allowable service temperature depends in many cases essentially on the duration and the magniture of the mechanical stresses to which the material is subjected.
Minimum service temperature	-20°C	-	Impact strength decreasing with decreasing temperature, the minimum allowable service temperature is practically mainly determined by the extent to which the material is subjected to impact.The value given here is based on unfavourable impact conditions and may consequently not be considered as being the absolute practical limit.
Flammability: Oxygen Index	25%	-
Flammability: according to UL 94 (3/6mm thickness)	HB/HB	ISO 4589-1/-2

 

Mechanical Properties at 23°C*	Value	Test Methods	Notes
Tensile Stress at yield / Tensile Stress at Break	90 / - MPa	ISO 527-1/-2	+/++ Test speed:50mm/min [chosen acc. to ISO 10350-1 as a function of the ductile behaviour of the material (tough or brittle)]
Tensile Strength	90 MPa	ISO 527-1/-2	+ Test speed:50mm/min [chosen acc. to ISO 10350-1 as a function of the ductile behaviour of the material (tough or brittle)]
Tensile Strain at Yield	4%	ISO 527-1/-2	+ Test speed:50mm/min [chosen acc. to ISO 10350-1 as a function of the ductile behaviour of the material (tough or brittle)]
Tensile Strain at Break	15%	ISO 527-1/-2	+/++ Test speed:50mm/min [chosen acc. to ISO 10350-1 as a function of the ductile behaviour of the material (tough or brittle)]
Tensile Modulus of Elasticity	3500 MPa	ISO 527-1/-2	+/++ Test speed: 1mm/min
Compression test: compressive stress at 1 / 2 / 5% nominal strain	33/64/107 MPa	ISO 604	+ Test speed: 1mm/min Test specimens: cylinders Ø 8mm x 16mm
Charpy impact strength - Unnotched	50 kJ/m2	ISO 179-1/1eU	+ Pendulum used: 4 J
Charpy impact strength - Notched	2 kJ/m2	ISO 179-1/1eA	+
Ball indentation hardness	170 N/mm2	ISO 2039-1	+ Measured on 10mm thick test specimens (discs), mid between centre and outside diameter
Rockwell hardness	M 96	ISO 2039-2	+ Measured on 10mm thick test specimens (discs), mid between centre and outside diameter

 

* 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). 

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.

Typical PET Chemical Composition

The chemical formula of PET is (C10H8O4)n