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NEOSORB® (AASHTO Grade Polychloroprene) Bearing Pads
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NEOSORB® plain elastomeric (polychloroprene / neoprene) bearing pads are molded or cut to size from larger slabs to provide a low-cost, single element structural bearing. Plain elastomeric bearings are a cost effective option for applications with moderate load transfer and movement requirements. NEOSORB® pads accommodate surface irregularities, vertical load, and rotation through vertical deflection, while longitudinal movement is accommodated through shear deformation. These pads are suitable for use in pre-cast concrete, cast in place concrete, and steel framed structures.
NEOSORB® is available in all 3 standard AASHTO durometers: 50, 60, and 70, widths up to 48", and lengths up to 49 feet (+/- 1 ft). NEOSORB® is typically available from stock in the following thickness: 1/8", 1/4", 1/2", 3/4", and 1".
For pad sizing and selection in the absence of project specifications or owner design criteria, Voss Engineering, Inc. recommends following AASHTO Section 14 Design Specifications for plain elastomeric bearings (PEP).
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| Material Property |
ASTM Standard |
Test Requirement |
Polychloroprene |
Units |
| 50 Duro |
60 Duro |
70 Duro |
| Physical Properties |
D 2240 |
Hardness |
50 ± 5 |
60 ± 5 |
70 ± 5 |
Shore A |
| D 412 |
Min tensile strength |
2250 (15.5) |
2250 (15.5) |
2250 (15.5) |
psi (Mpa) |
| Min ultimate elongation |
400 |
350 |
300 |
% |
| Heat Resistance |
D 573 |
Specified temp. of the test |
212 (100) |
212 (100) |
212 (100) |
°F (°C) |
| Aging time |
70 |
70 |
70 |
Hours |
| Max change in durometer hardness |
15 |
15 |
15 |
Shore A |
| Max change in tensile strength |
-15 |
-15 |
-15 |
% |
| Max change in ultimate elongation |
-40 |
-40 |
-40 |
% |
| Compressive Set |
D 395 Method B |
Specified temp. of the test |
212 (100) |
212 (100) |
212 (100) |
°F (°C) |
| Max Permissible test (after 22 hrs) |
35 |
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| Ozone Resistance |
D 1149 |
100 pphm ozone in air by volume 20% strain at 100 °F, ± 2 °F (37.7 °C ± 1 °C) 100 hours, mounting procedure D 518, method A |
No cracks |
No cracks |
No cracks |
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| Tear Resistance |
D 624 Die C |
Minimum pounds per inch |
180 |
180 |
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Lbs/in |
| Brittleness |
D 746 |
Low temperature brittleness at -40° |
No Failure |
No Failure |
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