PETP - Polyethylene Terephthalate

Polyethylene Terephthalate (PETP) differs from other wear-resistant construction plastics due to its high tensile and bending strength and compressive strength. It is one of the hardest types of plastic, does not suffer from creep (cold flow) and it absorbs virtually no moisture. However, the relative brittleness of the material must be taken into account, which makes it less suitable for impact loads.

PETP has a very low coefficient of friction, is self-extinguishing and food-safe. Dimensionally stable precision work is the ideal area of ​​use for this plastic, also available in self-lubricating (TX) quality.

PETP in our webshop

Unique features

  • Good wear resistance
  • Rock hard, shape and dimension stable
  • Very low coefficient of friction
  • No stick-slip effect
  • Self-extinguishing

Applications

  • Food and drink storage
  • Retail stands and displays
  • Point of sale
  • Sign making
  • Packaging
  • Glazing
  • Protective screens

Machining options

  • Water jet cutting
  • Laser cutting
  • Gluing
  • Welding
  • Hot bending
  • Cold bending
  • Thermal forming
  • Yes
  • Not in all cases
  • No

How to identify PETG

To identify PETG, first drop a small sample in some water; it should float.  Then ignite the sample and it will burn quickly with a blue flame with yellow tip.  There will be a paraffin smelling odour and the sample will melt and drip.

Info per sector

PETG Advertising Plastics

PETG combines superior vacuum forming properties with excellent mechanical properties. With PETG it is possible to design and produce very complex transparent displays, shop fittings and high quality machines. PETG is food grade and very impact resistant. Fire properties: Many PETG versions comply with fire class B1 and can therefore be used in many places where high fire requirements are required. Think of trade fairs, indoor shopping centres and airports.

Applications

  • Displays
  • Shop fittings
  • Drink and vending machines
  • Shop interiors

Example

Vivak PET-G Schiphol

PETG Engineering Plastics

PETG polyester sheet is in between Acrylic (PMMA) and Polycarbonate (PC) in terms of technical properties and price.

The crystal clear material has excellent vacuum forming properties and good impact resistance. It can be welded with high frequency and ultrasonics and is suitable for direct contact with food, but has a lower maximum working temperature than Acrylic and PC.

PET-G is qualified for fire class B1, self-extinguishing.

ApplIcations

  • Protective covers for machines
  • Transparent machine cover
  • Cards

Example

PET-G Machinekap

What is the difference between PETG and Acrylic or Polycarbonate?

We often receive questions about the differences between the three most commonly used transparent plastics, PETG, Polycarbonate and Acrylate. To make the most important differences clear, we have created the table below. If you would like definitive advice on which material is suitable for your application, please contact us. 

 Property Acrylic Polyester (PETG) Polycarbonate
Transparency/clarity Excellent High High
Weight Low Low Low
Strength 30x stronger than glass 150x stronger than glass 250x stronger than glass
Weather resistance Excellent Good Good
Cold blend Low Average Good
Hot bend Good Good Good
Drilling, sawing, milling Good Good Good
Printability Good Good Good
Available thicknesses 2 to 100mm 0.5 to 12mm 1 to 12mm
Fire class* B2 B1 B1

 

*tested according to DIN 4102

If fire safety plays a role, we advise you to use a fire-retardant material. Both Polyester and Polycarbonate are fire retardant and have fire class B1. The German DIN 4102 has been drawn up by the Deutsches Institut für Normung. This institute deals with the most diverse standard topics. This classification is seen as the European standard when it comes to fire safety of products.

The following are the categories listed in order of degree of flammability:

Fire standard DIN 4102

Class Degree of flammability
A1 100% non-combustible
A2 98% non-combustible
B1 Flame-resistant
B2 Flammable
B3 Highly flammable

 


Technical information

  • General
    Description Norm Unit Value
    Density ISO 1183 g/cm³ 1.38
    Moisture absorption in normal climate - % 0.2
    Fire behaviour DIN 4102 - HB
    Specific heat capacity - kj/Kg°C 1.05
  • Mechanical
    Description Norm Unit Value
    Tensile strength DIN 53455 N/mm 90
    Stretch to break DIN 53455 % 20
    E-Modulus DIN 53457 (23 °C) N/mm²  3000
    Flexural strength DIN 53452 N/mm²  145
    Impact strength DIN 53453 (23 °C) Charpy 2
    Shore or ball pressure hardness - Shore °D 84
    Coefficient of friction - - 0.22
  • Electrical
    Description Norm Unit Value
    Relative electrical constant DIN 53485 (100Hz) 100Hz 3.4
    Dielectric loss factor DIN 53483 (100Hz) tan (..x10-³ 0.02
    Specific resistance DIN 53482 16 Ω cm 10
    Surface resistance DIN 53482 13 Ω 10
    Creep current resistance DIN 53480 KC 125
    Breakdown voltage DIN 53481 kV/mm 20
  • Thermal
    Description Norm Unit Value
    Crystalline melting point - °C 255
    Thermal conductivity DIN 52162 W/m°K 0.28
    Linear expansion coefficient DIN 53762 mm/m°C 0.06
    Long-term operating temperature without load - °C -20 / 115
    Maximum short-term use temperature - °C 160
    Heat shape resistance DIN 53461 °C 80
  • Temperature range
    Minimum temperature Maximum temperature
     -20°C  +115°C

Processing data

  • Circular sawing
    Clearance angle (α)15 - 30 [o]
    Chip angle  (λ)8 - 8 [o]
    Cutting speed 800 [m/min]
    Tooth spacing 3 [mm]
  • Band sawing
    Clearance angle (α) 15 - 30 [o]
    Rake angle (λ) 5 - 8 [o]
    Cutting speed 800 [m/min]
    Tooth spacing 2 - 3 [mm]
  • Drilling
    Clearance angle (α) 5 - 10 [o]
    Rake angle (λ) 10 - 20 [o]
    Top angle (φ) 90 [o]
    Cutting speed 50 - 100 [m/min]
    Start 0.2 - 0.3 [mm/rev]
  • Turning
    Clearance angle (α) 5 - 10 [o]
    Rake angle (λ) 0 - 5 [o]
    Setting angle (χ) 45 - 60 [o]
    Cutting speed 300 - 400 [m/min]
    Start 0.1 - 0.5 [mm]
  • Milling
    Clearance angle (α) 5 - 15 [o]
    Rake angle (λ) 5 - 15 [o]
    Cutting speed 200 - 500 [m/min]
    Start 0.1 - 0.5 [mm/rev]