Silicone Rubber Tires Standard Dimensions Range
This tire drawing shows the inside diameter (i.d.) and outside diameter (o.d.)
| 8 to 250 |
5 to 650 |
6 to 200 |
5% to 15% bigger than bore diameter |
Bore size relative to shaft size is dependent on the tire wall thickness and the tire width.
Silicone Rubber Tires Standard Physical Properties
| Material |
S18 |
S46 |
S15 |
S1 |
S22 |
| Hardness° Shore A |
40 |
55 |
60 |
65 |
80 |
| Tensile Strength MPA |
8 |
7 |
5 |
7 |
9 |
| Specific Gravity |
1.1 |
1.18 |
1.16 |
1.22 |
1.4 |
| Elongation @ Break % |
500 |
500 |
180 |
300 |
200 |
| Hardness° Shore A |
5 |
20 |
30 |
40 |
50 |
60 |
70 |
| Tensile Strength MPA |
2 |
5 |
8 |
9 |
10 |
10 |
10 |
| Specific Gravity |
1.05 |
1.09 |
1.13 |
1.13 |
1.14 |
1.14 |
1.14 |
| Tear Strength KN/ml |
7.5 |
28 |
20 |
33 |
45 |
49 |
49 |
| Elongation @ Break % |
675 |
900 |
850 |
770 |
630 |
460 |
470 |
All the above materials are available with a 27° Shore A S47 silicone high coefficient of friction coating.
Silicone Properties
Hardness Range
Fenner Precision's Winthane silicones can be formulated in hardness ranges from 10 shore A to 75 shore A durometer.
Temperature Resistance
Winthane silicone maintains its elasticity and physical properties over a wide range of temperatures from 230° C (446° F) to -60° C (-75° F).
Chemical Resistance
Winthane silicone elastomers offer good chemical resistance to oils and greases.
Weather Ability
Winthane silicones withstand environments which break down conventional elastomers over extended periods. Silicones offer good ozone and UV light resistance.
Electrical Performance
Winthane silicones are naturally electrically isolative. Specially engineered silicones can be produced to offer semi-electrical conductivity used in electrostatic imaging applications.
Low Compression Set
Winthane silicones have excellent elastic memory and low compression set properties make them ideal candidates for tire applications.
Bondable to Metal
Winthane silicone bonds reliably to clean, porous surfaces. High strength bonds, stronger than the elastomer itself, can also be achieved on nonporous surfaces such as metals through the use of surface treatments and primers.
Engineered Silicone Elastomers
High-temperature resistant, Solvent resistant, Thermally conductive, Electrically conductive.
Engineered Properties
- Thermal Conductivity
Winthane silicones can be formulated to obtain various levels of thermal conductivity by the addition of iron oxide, aluminum oxide and other materials.
- Electrical Conductivity
Winthane silicones can be formulated to semi-conductive ranges with the use of carbon fillers in the formulation.
- Self-Lubricating
Winthane silicones are self-lubricating with the addition of phenyl silicone fluids.
Fenner Precision custom formulates hundreds of silicone compounds. Properties vary greatly depending on the application the silicone is designed for. The follow chart shows a small sample of our compounds used to help describe the vast range of properties available.
| Hardness (ASTM D2240) A Scale |
30A |
43A |
50A |
55A |
60A |
70A |
| Tensile (ASTM D412)
100% Modulus psi
Break
|
170 505 |
450 700 |
520 755 |
610 800 |
775 880 |
700 930 |
| Elongation (ASTM D412)
% at Break
|
255 |
200 |
185 |
180 |
110 |
170 |
| Resilience (ASTM D2632)
% Rebound
|
35 |
40 |
35 |
40 |
40 |
40 |
| Tear Strength (ASTM D624)
Die C pli
|
28 |
50 |
35 |
45 |
75 |
90 |
| Compression Set (ASTM D395, Method B, 22 Hours
@ 70°C)
Die C pli
|
5 |
3 |
3 |
2 |
2 |
2 |
