The Fastite joint sealing component – a molded synthetic rubber ring gasket of two hardnesses, shaped to fit the configuration of the gasket socket – is manufactured per all requirements of ANSI/AWWA C111/A21.11 and under AMERICAN’s own rigid specifications, assuring closely controlled dimensional and hardness properties. The smaller end of the gasket is of harder rubber, approximately 85 durometer hardness, which provides a strong shoulder for self-centering on the gasket buttress, a permanent seal against cold flow, and protection from deterioration. The larger end of the gasket is of softer rubber, approximately 65 durometer hardness, providing ease of assembly and positive sealing. The design assures effective sealing at low or high pressures and in straight or deflected joint alignment. It also eliminates any concerns of infiltration or root intrusion, and assures positive sealing against negative pressure, thus preventing gasket “pullout” should a vacuum be created in the line.
A taper on the inside of the gasket allows the entering pipe to locate and center on the hard section and reduces friction loads during subsequent assembly. The snug fit and the hard section of the gasket, in conjunction with the design of the buttress, act to restrain the gasket against dislodgment during assembly. Additional internal pressure results in increased tightness of the seal when pipe is either in straight alignment or deflected.
1.) When installing joints manufactured by AMERICAN Cast Iron Pipe Company, the use of gaskets not manufactured by AMERICAN or an authorized manufacturer of AMERICAN gaskets will invalidate joint warranties.
Gaskets made of SBR (Styrene Butadiene Rubber) are standard with all joint types. Consult AMERICAN for information or recommendations on gaskets made of special types of rubber, for applications involving air or liquid temperatures in excess of 150° F, or for chemical, hydrocarbon or other special service applications, and for installations in contaminated soils where permeation through gaskets might be a concern.
In the table below, temperature capability refers to conveyed fluid. Lubricating oil in air can adversely affect SBR and EPDM performance. SBR, Nitrile and Neoprene are not recommended for hot air exposure in wastewater treatment systems.
SBR rubber gaskets are ANSI/NSF Standard 61 certified for contact with potable water. All gaskets made from the materials as shown are suitable for use with water containing normal concentrations of chloramine. Where increased resistance to chloramine is desired, neoprene or fluoroelastomer materials should be considered. Consult AMERICAN.
Common Name | Chemical Name | Common Uses | Maximum Service Temperature 2 | |
|---|---|---|---|---|
Water & Sewer | Air | |||
Plain Rubber | Styrene Butadiene | Fresh Water, Salt Water | 150 | 150 |
Plain Rubber | Styrene Butadiene | Electrical continuity for thawing | 150 | 150 |
EPDM | Ethylene Propylene | Water, Sewage, Ketones, | 212 | 200 |
Neoprene | Polychloroprene(CR) | Fresh Water, Sewage | 200 | 180 |
Nitrile | Acrylonitrile | Non-Aromatic Hydrocarbons, | 150 | 150 |
Fluoroelastomer | FKM | Aromatic Hydrocarbons, Gasoline, | 212 | 300 |
1.) AMERICAN reserves the right to furnish any trade or brand rubber for the chemical formulation specified.
2.) Temperature is in reference to conveyed fluid. Lubricating oil in air can adversely affect SBR and EPDM performance. SBR, Nitrile and Neoprene are not recommended for hot air exposure in wastewater treatment systems.
3.) Viton® is a registered trademark of DuPont Dow Elastomers.
4.) This gasket rubber is chemically resistant in the non-potable water uses shown but is not as resistant to permeation in potable water applications as FKM.
