RonamFlon RG+PTFE+INOX bearings (Type D)
RonamFlon RG+PTFE+INOX bearings (Type D)
These bearings are made by vulcanizing a layer of rubber (or rubber reinforced with a sheet of steel), to a smooth or molded layer of PTFE, then an AISI 304 stainless steel is applied over the top of the bearing.
They are available in various shapes (circular, square or rectangular), and in thicknesses and dimensions that clients require.
| Rubber properties | M.U. | Requirements | Test methodology |
|---|---|---|---|
| Hardness | IRHD | 60 | ISO 4894 |
| Hardness range | IRHD | ± 3 | ISO 4894 |
| Resistance at break | MPa | ≥ 16,00 | ISO 37/94 |
| Elongation at break | % | ≥ 425 | ISO 37/94 |
| 25% Compression set 24h 70° | % | ≤ 30 | ISO 815/914 |
| Tear resistance | N/mm | ≥ 8 | ISO 34-1/04 |
| After 7 days at 70°C ageing in air thermostat | ISO 188/98 | ||
| Hardness variation | IRDN | -5/+10 | |
| Resistance at break variation | % | ± 15 | |
| Elongation at break variation | % | ± 25 | |
| Ozone resistance (25 p.p.c.m. 30% 96 h 40°C) | No cracks at sight | ISO 1431-1/04 | |
| Fragility limit variation | °C | ≤ 40 | ISO 812/91 |
| Rubber-metal attack | N/mm | ≥ 7 | ISO 813/97 |
| G modulus | MPa | 0,90 | E 1337-3/05 |
| PTFE G400 properties | M.U. | Requirements | ASTM test methodology |
| Specific weight | G/cm³ | 2,14 - 2,18 | D792 |
| Hardness | Shore D | 51 – 60 | D2240 |
| Tensile strenght | N/mm² | > 20 | D4745 |
| Elongation at break | % | > 200 | D4745 |
| Compression resistance with 1 % deformation | N/mm² | 4 - 5 | D695 |
| Under load deformation at ambient temperature after 24 hours at 13,7 N/mm² | % | 14 – 17 | D621 |
| Permanent deformation as above and after 24 hours of rest | % | 7 – 8 | D621 |
| Dynamic friction coefficient | 0,06 | D1894 | |
| Exercise temperature (min – max) | °C | -200 / +200 | |
| Expansion linear thermic coefficient 25 – 100 °C | 10 / °C | 12 – 13 | D696 |
| INOX STEEL AISI 304 L mechanics properties at 20°C | Requirements | ||
| Brinell Hardness | 130 ± 150 | ||
| Load at break | 500 ± 680 | ||
| Removal U load | 175 ± 300 | ||
| Minimum resistance | 160 |