HDRB high damping rubber bearings consist of alternate layers of elastomeric material and vulcanized reinforcement steel plates. They provide a high level of damping of up to 16% since they are made up of a chemically improved rubber compound providing better damping and displacement capacity. As the reinforcement steel plates are fully embedded in the elastomeric material they are sealed and thus protected against corrosion. The devices are manufactured with the rubber vulcanized to the top and bottom connection plates. The bearings can also be supplied with additional anchor plates, allowing easier replacement of the device in case of maintenance needs. BAOLI HDRB devices are made from natural rubber (NR) providing a high resistance against mechanical wear and corrosion.
Details(HDRB)
Rubber – the elastomer of the isolator will be natural rubber or neoprene rubber, all material testing shall be in accordance with EN , or cross reference EN standard; Shim Plates- Shim plates and top and bottom end plates will be made from rolled carbon steel conforming to ASTM or equivalent conforming to EN.
Physical and mechanical properities of elastomer
Characteristics | Requirements | Test methods | ||
G Modulus (MPa) | 0.7 | 0.9a | 1.15 | |
Tensile strength (MPa)
Moulded Test Piece Test Piece From Bearing Minimum Elongation at Break (%) Moulded Test Piece Test Piece from Bearing |
≥16 ≥14 |
≥16
≥14 |
≥16
≥14 |
ISO 37
type 2 |
450
400 |
425
375 |
300
250 |
||
Minimum Tear Resistance (kN/m )
CR NR |
≥7 ≥5 |
≥10 ≥8 |
≥12 ≥10 |
ISO 34-1
Touser (Method A) |
Compression Set (%)
24h; 70℃ |
CR≤15
NR≤30 |
ISO 815
φ29×12,5mm Spacer: 9,38-25% |
||
Accelerated Ageing
(Maximum change from unaged value) -Hardness (IRHD) NR 7d, 70℃ CR 3d, 100℃ -Tensile strength (%) NR 7d, 70℃ CR 3d, 100℃ -Elongation at break (%) NR 7d, 70℃ CR 3d, 100℃ |
-5+10 ±5
±15 ±15
±25 ±25 |
ISO 48
ISO188 |
||
Ozone Resistance
Elongation: 30%-96h 40℃±2℃ NR 25 pphm CR 100pphm |
No cracks | ISO 1431-1 |
BAOLI is able to perform full scale bearing size testing in house according to EN. BAOLI lab is fully equipped with full range of testing rig from 200kN to 1500kN vertical load and 100kN to 300 kN shear load, can meet the test requirements.