Natural Rubber Spec - H3
HYDRAULIC GATE SEALS: DESIGN GUIDELINES
The rubber seal compound shall be one of the following: natural rubber/poly- isoprene or neoprene. The compound shall have no reclaimed polymers and include reinforcing carbon black, zinc oxide, accelerators, antioxidants, vulcanizing agents and plasticizers. The rubber seal profile shall be properly cured into a homogeneous form and kept free of oils, grease, or other materials which would deteriorate the rubber. Physical characterisics of the seals shall meet the following minimum requirements:
COMPOUND OPTIONS: SU13366 - Natural Rubber/Polyisoprene
PHYSICAL TEST | TEST METHOD TEST VALUE | SPECIFICATION |
| DUROMETER HARDNESS (SHORE A) | 60 - 70 | ASTM D2240 |
| TENSILE STRENGTH | 3000 PSI (MIN) | ASTM D412 |
| ELONGATION AT BREAK | 450%(MIN) | ASTM D412 |
| 300% MODULUS | 900 PSI (MIN) | ASTM D412 |
| COMPRESSION SET | 30% (MAX) | ASTM D395 METHOD B |
| WATER ABSORPTION | 5% BY WEIGHT (MAX) | ASTM D 471 |
| AGED THEN IMMERSED AT 70 C FOR 166 HRS - NATURAL RUBBER AND BLENDS AGED THEN IMMERSED AT 100 C FOR 166 HRS - NEOPRENE | ||
| AGING : TENSILE STRENGTH (48 HRS OF AGING) | 80% OF STRENGTH(MIN) | ASTM D 572 |
| LOW TEMPERATURE BRITTLENESS | NON BRITTLE 3' @ -40 C | ASTM D 2137 METHOD A |
