Products
Details
Uses
As economical efficient bearing plates for pre-cast, pre-stressed concrete or steel beams in bridges and buildings.
Neoprene Pads permit a smooth and uniform transfer of load from the beam to the substructure and allow beam rotation at the bearing due to deflection of the beam under load.
They further allow lateral and longitudinal movement of the beam caused by thermal forces. Neoprene Pads have no moveable parts and thermal expansion and contraction are absorbed by the pad’s ability to give and take in shear. There is no sliding between pad and beam or between pad and abutment.
Williams AASHTO Grade 3 Neoprene Bearing Pads Specification M251-06
Bridge Bearing contain only virgin crystallization resistance Polychloroprene (Neoprene) raw polymer Grade 3
Typical Physical Properties
| Material Property | ASTM Standard | Test Requirements | 50 Duro | 60 Duro | 70 Duro | Units |
|---|---|---|---|---|---|---|
| Physical Properties | D2240 | Hardness Min Tensile Strength Min Ultimate Elongation |
50 ±5 2250* 400 |
60 ±5 2250* 350 |
70 ±5 2250* 300 |
ShoreA psi (Mpa) % |
| Heat Resistance | D573 at spec. temp | Specified Temp of Test Aging Time Max Change in Duro Hardness Max Change in Tensile Strength Max Change in Ultimate Elongation |
212 (100) 70 +15 -15 -40 |
212 (100) 70 +15 -15 -40 |
212 (100) 70 +15 -15 -40 |
°F (°C) Hours *Shore Pt % % |
| Compression Set | D395 Method B at Spec. Temp | Specified Temp of Test Degrees Max Permissible Test (after 22 Hours) |
212 (100) 35 |
212 (100) 35 |
212 (100) 35 |
°F (°C) % |
| Bar Resistance | D624 | Min Pounds Per Inch (Die C) | 180 | 180 | 180 | Pounds/I n |
| Brittleness Ozone Resistance | D2137 D1149 |
Low Temp Brittleness at -40°F (- 40°C) Partial Presser of Ozone During Test Duration of Test Tested at 20% Strain 100°F ±2°F (37.7°C ±1°C) Mounting Pressure |
Pass 50 100 No Cracks |
Pass 50 100 No Cracks |
Pass 50 100 No Cracks |
Mpa Hours |
| Shear Modulus | D4014 | At 73°F (23°C) | 0.60-0.77 85-110 |
0.85-1.10 120-155 |
1.13-1.84 160-260 |
Mpa PSI |
Note: Williams Bearing Pads conforms to grade 3 as follows:
LOW TEMPERATURE BRITTLENESS: D-746, procedure B, @ -40°F, resulting in no failures, 50, 60, and 70 ±5% Shore A
Durometer.
INSTANTANEOUS THERMAL STIFFENING: D-1043, grade 3, tested @ -40°F.
LOW TEMPERATURE CRYSTALLIZATION: Grade 3, 14 days, @ -15°F.
Stiffness at test temperature shall not exceed 4 times the stiffness measured at 73°F.
* Higher tensile strength available upon request