Vesconite Guide -
Vesconite Specifications Sheet -
Vesconite Chemical Resistance Sheet
Vesconite Hilube Specification Sheet -
Vesconite Hilube Chemical Resistance Sheet
LOAD (k /sq cm) x SPEED (metres/min) LIMITS (P.V LIMITS)
Temperature Limits
- Do not use Vesconite over 100c
- Do not use Vesconite in steam or boiling water
- Over 80c load limits reduce by half
Machining Information
Turning
- Clamp carefully to avoid cracking and distortion due to excessive pressure
- Allow the part to coom before final precision turning
- Use cutting speeds of about 400 metres/minute
- Rate of feed 0.1 to 0.2mm per revolution
- Use an end relief and rake angle of 5o
Sawing
- Use tooth pitch 2 to 3 mm
- Use speed 250 metres/minute
Drilling
Use pilot holes when drilling holes over 20mm diameter
Use cutting speeds of 15 metres/minute
Avoid excessive pressures, overheating or clogging of hole with cuttings
Thermal Expansion – Clearance Loss
When a bush is confined in a housing the clearance will decrease with a rise in temperature.
Loss of clearance (CL) is given by:
A simplified method of calculation being :
Where E = coefficient of expansion, and T = Temperature change above ambient, based on 10mm wall thickness
Material Coefficient of thermal expansion as follows:
| Vesconite | 5 x 10-5 mm/mm/oC (0.00005) |
| Standard Nylon | 9 x 10-5 mm/mm/oC (0.00009) |
| Vescolene PP | 18 x 10-5 mm/mm/oC (0.00018) |
| Vescolene PE | 20 x 10-5 mm/mm/oC (0.00020) |
| Vescolene Ultra | 20 x 10-5 mm/mm/oC (0.00020) |
Average PV Limits for Vesconite
LOAD (kg/sq cm) X SPEED (metres/min) limits. (P.V limits)
Average PV limits for Vesconite
| Unlubricated | 50 | Lubricated Continuously | 400 |
| Lubricated initially | 100 | Under Water operation | 2000 |
Example
Assume Total Load on Bush -
200kg
Assume Shaft -
100rpm
Average PV Limits for Vesconite
 |
PROJECTED BEARING AREA: ABCD
IS 2.5cm x 1.5cm = 3.75cm
SPEED = RPM x CIRCUMFERENCE (METRES)
= 100 x 0.015 (METRES) x 3.14 (PYE)
= 4.7 METRES/MIN
P.V = LOAD x SPEED = 53.3 x 4.7 = 250 |
From the P.V Table Vesconite would be suitable provided there is continuous lubrication.
Interference/Running Clearances
- For press fit use an interference ranging from 0.05 for thick walled bushes, increasing to 0.2mm for thin walled bushes.
- Note: If bore cannot be machined after bush is pressed into housing, add interference to running clearance when machining bore.
- Allow a basic running clearance 0.05mm to which must be added 0.015mm for every mm single wall thickness.
- High speeds and hot running clearances must be doubled.
Physical properties may be altered to some extent by processing conditions.
| Density |
1.38 g.ml |
| Melting point |
260 oC |
| Hardness (Shore D) |
84 |
| Tensile strength at yield (ASTM D-638) |
65 MPa |
| Tensile strength at break |
62 MPa |
| Elongation at break |
26% |
Tangent modulus of elasticity (ASTM D-790) |
3400 MPa |
| Flexural yield strength |
120 MPa |
| Deflection temperature at 1.85MPa |
93 °C |
| Modulus of elasticity under compression |
2290 MPa |
| Compression strength at yield |
98 MPa |
| Shear strength |
49 MPa |
| Notched impact strength charpy (ASTM D-256) |
33 J.m |
| Notched impact strength IZOD |
16 J.m |
| Heat conductivity |
0.3 W.K.m |
| Coefficient of linear thermal expansion |
6x10-5 oC |
| Maximum moisture absorption in water at 20°C |
0.5% |
| Equilibrium moisture absorption in air (50%
RH, 23°C) |
0.2% |
| Dynamic unlubricated friction coefficient on steel |
0.12-0.20 |
| Dielectric strength |
14 kV.mm |
| Gamma ray resistance 50% loss of properties |
100 Mrads |
The above data should be taken for indicative purposes. Physical properties maybe altered to some extent
by processing conditions.
Vesconite is unaffected for 1 week at 20°C by:
| 30% Sulphuric Acid |
Ethanol, Methanol |
| 40% Nitric Acid |
Freon 11 |
| Concentrated Hydrochloric Acid |
Butane and Heptane |
| 1% Sodium Hydroxide |
Mineral oils |
| 10% Sodium Chloride |
Transformer oil |
| 20% Sodium Carbonate |
Brake fluid |
| 10% Sodium Hypochlorite |
Paraffin |
| 30% Hydrogen Peroxide |
High octane petrol |
| Density |
1.38 g.ml |
| Melting point |
260 °C |
| Hardness (Shore D) |
82 |
| Tensile strength at yield (D638) |
66 MPa |
| Tensile strength at break |
65 MPa |
Elongation at break |
58% |
| Tangent modulus of elasticity (D790) |
3726 MPa |
| Flexural yield strength |
113 MPa |
| Deflection temperature at 1.85
MPa |
117 °C |
| Modulus of elasticity under compression |
2206 MPa |
| Compression strength at yield |
99 MPa |
| Shear strength |
49.4 MPa |
| Notched impact strength charpy (D256) |
26 J.m |
| Notched impact strength IZOD |
30 J.m |
| Heat conductivity |
0.3 W.K.m |
| Coefficient of linear thermal expansion |
6x10-5 oC |
| Maximum moisture absorption in water at
20 °C |
0.5% |
| Equilibrium moisture absorption in air (50% RH,
23 °C) |
0.2% |
| Dynamic unlubricated friction coefficient on steel. |
0.10 |
| (test at 8 MPa, 0.8 m.min,PV=6.4
MPa.m.min) |
|
| Static friction coefficient on polished steel (no
lubrication) |
0.09 |
| Dielectric strength |
14 kV.mm |
| Gamma ray resistance 50% loss of properties |
100 Mrads |
The above data should be taken for indicative purposes. Physical properties may be altered to some extent by
processing conditions.
| 30% Sulphuric Acid |
Ethanol, Methanol |
| 40% Nitric Acid |
Freon 11 |
| Concentrated Hydrochloric Acid |
Butane and Heptane |
| 1% Sodium Hydroxide |
Mineral oils |
| 10% Sodium Chloride |
Transformer oil |
| 20% Sodium Carbonate |
Brake fluid |
| 10% Sodium Hypochlorite |
Paraffin |
| 30% Hydrogen Peroxide |
High octane petrol |
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