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Filled PTFE grades
Brand: 
- PTFE+25% glass
- PTFE+60% bronze
- PTFE+25% carbon graphite
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AVAILABLE FILLERS:
PTFE+25% glass
PTFE+60% bronze
PTFE+25% carbon graphite
SPECIFICATIONS
The properties of PTFE mentioned above make this material an indispensable solution for a number of problems which would otherwise be extremely complex, where not unsolvable at all.
Some specific applications, however, require that the product properties be improved.
In these cases, substances known as “fillers” are used to change the aforementioned features of PTFE by adding the necessary powder additives in the polymer.
The fillers most commonly used include glass fibre, carbon, graphite, molybdenum disulphide, bronze, ceramic powders, and also mixtures of two or more fillers. The type and quality of these fillers may:
- increase the compressive yield strength;
- increase wear resistance;
- reduce the thermal expansion coefficient;
- modify volume resistivity and surface resistivity;
- enhance hardness.
Physical properties of standard fillers:
| Properties | Standard | Unit of measurement | Value | Value | Value |
| General properties | PTFE+25% glass | PTFE+60% bronze | PTFE+25% carbon graphite | ||
| Density (specific weight) | ASTM D792 | g/cm3 | 2.20-2.26 | 3.80-4.00 | 2.05-2.11 |
| Mechanical properties | |||||
| Tensile strain at break | ISO 527 | % | ≥ 230 | ≥100 | ≥90 |
| Tensile strength | ISO 527 | N/mm2 | ≥ 17 | ≥ 15 | ≥ 14 |
| Flexural modulus under stress at room temperature after 24 h at 13.7 N/mm2 | ASTM D621 | % | ≤ 10 | ≤ 5 | ≤ 7 |
| Flexural modulus as above after 24 h rest at room temperature | ASTM D621 | % | ≤ 6.5 | ≤ 2 | ≤ 5 |
| Hardness | ASTM D2240 | Shore D | ≥ 60 | ≥ 65 | ≥ 64 |
| Thermal properties | |||||
| Working temperature | -- | °C | -200/+260 | -200/+260 |
-200/+260 |
| Coefficient of linear thermal expansion | v. m. tra 25 °C e 100 °C | 10-5(mm/mm)/°C | 7.5-11 | 4-7 | 10-12 |
| Electric properties | |||||
| Volume resistivity | ASTM D257 | Ohm•cm | > 1015 | 10 7 |
10 3 |
| Surface resistivity | ASTM D257 | Ohm | > 1015 | 10 8 |
10 3 |
| Physiological properties | |||||
| Suitable for contact with foodstuffs | 21CFR (FDA) | -- | Yes | No | No |
Although the information provided in this product data sheet is confirmed by reliable research, POLITECNICA CETAI shall not take any responsibility for the application, processing or use of such information.
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