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Fabric Bakelite
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Cotton- and phenolic resin-based laminates
Fabric bakelite sheets are manufactured in thickness ranges from 0.5 to 150 mm and are available in the following sizes: 1220x1220 mm, 1220x2200
mm, 1220x2440 mm, 1050x2050 mm. They come in insulation class E (120°C).
If compared to paper bakelite, fabric bakelite has definitely higher mechanical properties, although its dielectric
performances are not equally good.
Sheets are easy to cut at low thickness, i.e. up to 3 mm.
An additional quality of fabric bakelite is its satisfactory self-lubricating property.
Low thickness versions of the product may, for instance, be used for the manufacture of washers for small electric motors, wear washers for motor shafts, and highly flexure-stressed insulating flexible strips.
Higher thickness products are used for the production of vanes for centrifugal vacuum pumps, gaskets for metal pipe connection, sealing rings for pistons in hydraulic systems, clutch discs, bushings, sliding rails, and rolling mill tables.
The most prestigious application is for the production of resistant, self-lubricating and more importantly low noise gears.
Fabric bakelite can also be used to manufacture pipes and rods - the latter both milled from a sheet and rolled.
| Properties | Standard | Unit of measurement | Value |
| General | |||
| Corresponds to | CEI EN 60983 | PF CC 201 | |
| NEMA LI - 1 | C | ||
| DIN 7735 | HGW 2082 | ||
| CEI 15/10 | Type F | ||
| Physical | |||
| Colour | brown | ||
| Specific weight | ISO 1183 | g/cm3 | 1.35 (a) |
| Water absorption | ISO 62 | mm | 3 (b) |
| % | 3 (d) | ||
| Insulation class | IEC 60216 | °C | E (120 °C) |
| Self-extinguishing | UL94 | HB | |
| Thermal conductivity | ISO 8302 | W/mK | 0.2 |
| Expansion coefficient | VDE 0304/VSM | 10-6/K | 18 |
| Silicone resin content | IEC 371-2 | % | -- |
| Mica content | IEC 371-2 | % | -- |
| Mechanical | |||
| Flexural strength ⊥ | ISO 178 | MPa | 100 (a) |
| Charpy impact strength | ISO 179 | KJ/m2 | 9.7 (a) |
| Tensile strength | ISO 527 | MPa | 83 (a) |
| Compressive yield strength ⊥ | ISO 604 | MPa | 329 (a) |
| Layer detachment strength // | CEI | N | 7000 |
| Dielectric | |||
| Insulation resistance | ISO 60167 | MΩ | 1 |
| Dielectric strength // | IEC 60243-1 | KV | 2 (a) |
| Dielectric strength ⊥ | IEC 60243-1 | KV/mm | 0.6 (a) |
| Tracking resistance | IEC 60112 | V | -- |
| Arc resistance | ASTM D495 | S | -- |
Test conditions
a) 48h 15-35 °C 45/75% RH
b) 1h 105 °C
c) 24h 105 °C
d) 24h 23 °C in water
e) 48h 50 °C in water
f) 24h 120 °C in oil
g) 96h 45 °C 95% RH
These are indicative data as they represent the average values measured at the time of routine checks in production.
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