|Density at 20°C||1,15gm/cm³|
|Melting point||217°C - 220°C|
|Yield Stress||80 Mpa|
|Tensile Modulus of Elasticity||3280 Mpa|
|Flexural Strength||140 Mpa|
|Flexural Modulus of Elasticity||3240 Mpa|
|Hardness||80 - 85 Shore D|
|Co-efficient of Friction||± 0.1|
Supamide machines easily with most sharp metal and wood working cutting tools. Although some metal lathe tools give a good finish, aluminium cutting tips are recommended. When drilling, the cutting edge should be ground a little flatter, preventing the drill, from biting into the material, this is especially relevant when widening a pre-drilled hole.
Allow a running clearance of 0.03 per mm of wall thickness, plus an additional fixed clearance of 0.1 mm. If the bush is running hot, the clearances must be increased depending on the wall thickness and temperature.
Press Fit of 0.1mm to 0.3mm are usually used depending on the shaft size and bush wall thickness. Do not forget a corresponding closure will take place and must be allowed for when machining.
Loads and Speeds (P.V. Limit)
The maximum design static loading is 300kg per cm2 or 30 MPa. Kg/cm2 is more practical unit for some when calculating the load. For a bush the load is calculated by using the projected area i.e. shaft diameter x length. The maximum surface speed is limited by a number of factors, some being load, lubrication, coefficient of friction and cooling. This will affect the P.V. limit.
The load speed limit is known as the P.V. limit which is the product of the load and surface contact speed expressed in various units.
P.V. = Kg/cm2 x m/min
It must be pointed out that in practice the equation is not linear and must only be used as a rough guide or estimate.
P.V. Limit of Supdamide (No Lubrication): Kg/cm2 x m/min = 40 – 60 or 4 – 6 Mpa
* Continuous lubrication greatly increases the P.V. limit as does under water operation.
Supamide does absorb some moisture but at normal relative humidity levels it is not a factor and no allowances have to be made. One of Supamide’s most successful applications to date is in very humid and wet conditions. Only a minimum allowance was made for these conditions.
For more information on this and details on design and clearances as well as technical advice on your specific application please contact us directly.