What is PET FG natural?
PET FG natural is a polyethylene terephthalate in a food grade compound (FG). It offers high strength and stiffness, a low tendency to creep, very low moisture absorption and excellent sliding properties – for dimensionally stable, wear-resistant components with food contact.
Technical data
| Property | Value | Test method |
|---|---|---|
| General Properties | ||
| Density | 1.39 g/cm³ | DIN EN ISO 1183-1 |
| Water absorption | 0.25 % | DIN EN ISO 62 |
| Flammability (thickness 3 mm / 6 mm) | HB/HB | UL 94 |
| Mechanical Properties | ||
| Yield stress | 85 MPa | DIN EN ISO 527 |
| Elongation at break | 15 % | DIN EN ISO 527 |
| Tensile modulus | 3,200 MPa | DIN EN ISO 527 |
| Notched impact strength | 2.0 kJ/m² | DIN EN ISO 179 |
| Ball indentation hardness | 190 MPa | DIN EN ISO 2039-1 |
| Shore hardness | 83 scale D | DIN EN ISO 868 |
| Thermal Properties | ||
| Melting temperature | 255 °C | ISO 11357-3 |
| Thermal conductivity | 0.28 W/(m·K) | DIN 52612-1 |
| Coefficient of linear thermal expansion | 60 ·10⁻⁶/K | DIN 53752 |
| Service temperature, long-term | -20 to 115 °C | Average |
| Service temperature, short-term (max.) | 180 °C | Average |
| Heat deflection temperature | 80 °C | DIN EN ISO 75, Method A, HDT |
PET FG natural or PET (standard) in direct comparison
| Property | PET FG natural | PET (standard) |
|---|---|---|
| Density | 1.39 g/cm³ | 1.38 g/cm³ |
| Yield stress | 85 MPa | 85 MPa |
| Elongation at break | 15 % | 15 % |
| Tensile modulus | 3,200 MPa | 3,000 MPa |
| Notched impact strength | 2.0 kJ/m² | 2 kJ/m² |
| Shore hardness | 83 scale D | 84 scale D |
| Melting temperature | 255 °C | 248 °C |
| Heat deflection temperature | 80 °C | 80 °C |
| Service temperature, long-term | -20 to 115 °C | -20 to 115 °C |
PET FG natural in detail
1What is PET FG natural?+
PET FG natural is a polyethylene terephthalate in a food grade compound (FG). It offers high strength and stiffness, a low tendency to creep, very low moisture absorption and excellent sliding properties – for dimensionally stable, wear-resistant components with food contact. Compared to POM, it offers higher strength, lower creep and better resistance to acids. PET is sensitive to hydrolysis: cleaning with hot water above approx. 60 °C or steam is not recommended (risk of stress cracking).
2How does Liedtke machine PET FG natural?+
PET FG natural can be machined excellently using all conventional cutting methods; HSS or carbide tools are sufficient. Good cooling via chip removal avoids heat build-up; sharp edges and notches in the part should be avoided because of the low notched impact strength. For components with food contact, we use food-compatible cooling lubricants and supply with batch traceability on request.
3When should I choose PET FG natural?+
PET FG natural is used wherever dimensionally stable, wear-resistant sliding and functional parts come into contact with foodstuffs, for example in the food and packaging industry and in mechanical engineering for filling and conveyor systems:
- Sliding and guide elements in filling lines
- Format parts, star wheels and guide rails
- Precision parts with high dimensional stability
4What determines the price of a PET FG natural part?+
PET FG natural is calculated individually based on drawing or sample. The part price is mainly determined by the stock form and dimension, material utilisation (waste), machining effort and batch size. We are happy to quote binding prices on request.
5When is PET FG natural not the right choice?+
Just as important are the limits of the material:
- Not resistant to hot water above approx. 60 °C and steam (hydrolysis)
- Low notched impact strength
- Not resistant to strong alkalis and some solvents
6Advantages and disadvantages of PET FG natural+
An honest assessment:
- Advantage: Compound designed for food contact
- Advantage: High strength and stiffness, low tendency to creep
- Advantage: Very good sliding properties, high wear resistance
- Advantage: Very low moisture absorption, high dimensional stability
- Disadvantage: Not resistant to hot water above approx. 60 °C and steam (hydrolysis)
- Disadvantage: Low notched impact strength
- Disadvantage: Not resistant to strong alkalis and some solvents
Typical properties
- Compound suitable for food contact
- High strength and very good sliding properties
- High dimensional stability
Typical industries
- Food Industry
- Packaging Industry
- Mechanical Engineering
Downloads for PET FG natural
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A drawing or a sample is enough. We calculate concretely and advise openly whether PET FG natural is optimal for your application or an alternative makes more sense.
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