Nitrile 4G Gaskets are high-performance gaskets for concrete pipe which combine watertight sealing performance with the ability to resist common underground contaminants.
The Type 4G Nitrile gaskets were developed to specifically meet the needs of contemporary concrete pipe joint designs, while providing the ability to resist common underground contaminants.
Nitrile pipe gaskets are non-stock items and take 4-8 weeks lead time for production.
In addition to resistance to common hydrocarbons, Nitrile 4G also offers improved resistance to mixed contaminated chemistries. This is especially important where contaminants and their concentrations cannot be accurately predicted or determined. This can result in interactions among the contaminants which are difficult to anticipate and define.
|TEST REQUIREMENTS and RESULTS for NITRILE 4G GASKETS as in
ASTM C1619 Class D, and ASTM C 443-04 and CSA 257.3-03 for Oil-Resistant Gaskets
|Test||ASTM Test Method||Test Requirements||Typical Result|
|TENSILE STRENGTH||D 412||1200 PSI, MIN.||1403 PSI|
|D 412||350%, MIN.||563%
|HARDNESS||D 2240 (SHORE A|
|±5 FROM THE|
|D 573, 70± 1ºC|
FOR 7 DAYS
|DECREASE OF 15%,|
MAX. OF ORIGINAL TENSILE
OF 20%, MAX.
|COMPRESSION TEST||D 395, METHOD|
B, AT 70ºC FOR 22
|DECREASE OF 25%,|
MAX. OF ORIGINAL DEFLECTION
|WATER ABSORPTION||D 471 IMMERSE|
0.75 BY 2-IN.
AT 70ºC FOR 48 hrs
|INCREASE OF 10%,|
MAX. OR ORIGINAL BY
|OZONE RESISTANCE||D 1171||RATING 0||PASS|
|D 746||NO FRACTURE AT -40ºC||PASS|
D 471; ASTM IRM
|D 471; ASTM IRM|
903 AT 100ºC FOR
|80% MAX VOL. CHANGE||-1.9%|
An oil-resistant watertight rubber gasket shall be employed in the connections of concrete pipe for sanitary, stormwater, drainage, or other applications where contaminants are known or suspected.
The gasket shall be NITRILE 4G as manufactured by Press-Seal Corporation, Fort Wayne, Indiana, or approved equal.
The gasket shall be the sole element relied on to assure a flexible watertight seal between pipe connections. The gasket shall consist of a single wedge-shaped rubber element. The rubber compound used shall consist of synthetic nitrile butadiene rubber polymer and shall conform with the sealing and oil resistance requirements of ASTM C1619, Class D, ASTM C 443-04 for Oil-Resistant Gaskets, and CSA 257.3-03 for Oil-Resistant Gaskets.
Each gasket shall be individually identified with continuous blue or green stripe toward the leading edge of the gasket. This stripe shall be used to positively identify that the gasket is NITRILE 4G and to confirm its proper orientation on the spigot of the pipe.
Selection of the proper size gasket for the pipe requirement, and installation thereof, shall be in strict conformance with the recommendations of the gasket manufacturer. Any testing also shall be conducted in strict conformance with the requirements of the gasket manufacturer.
Due to inherent properties of Nitrile gaskets, special considerations are noted:
|158-4G||0.326 (8.3 mm)|
|210-4G||0.446 (11.3 mm)|
|288-4G||0.500 (12.7 mm)|