Consistency of U-shaped seals
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Pull-ring connections with U-shaped seals when compared with
pull-rings with sealant (mastic) are considerably tighter. In order to
withstand different chemical and thermal conditions, U-shaped seals are
delivered in different rubber qualities. The following consistencies are
standard qualities. To find further information about these qualities,
please refer to a detailed Elastomere-producer-data list.
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| NBR (Perbunan) | Food quality with FDA-Approval |
| Colour: | light grey |
| Temperature resistance: | -20 up to 100 degree C |
| Suitable for: | oil, fats, grease, petrol, petroleum, partially also against solvents |
| Less suitable for: | steam, chlorinated carbohydrogens |
| SI (Silicone) | Food quality due BGA Category IV |
| Colour: | beige |
| Temperature resistance: | -60 up to 250 degree C |
| Suitable for: | many organic oils and greases, saline solutions, ozone, cool water, partially also against solvents, resistant against ageing and weather |
| Less suitable for: | hot water, steam, acids, alkalies, mineral oil, fats and greases - diesel oil, benzol, petrol |
The standardized colour of silicone U-shaped seals for pipe flanges is beige. You will find the wall-thickness (1 or 2 mm) on the U-shaped seal. |
| EPDM (Keltan) | electrostatic conductivity (conductive at powder coated steel, galvanized mild steel and stainless steel) Food quality with FDA-Approval |
| Colour: | black |
| Temperature resistance: | -20 up to 120 degree C |
| Suitable for: | water, steam, acids, alkalies, ozone, partial also against solvents like aceton or MEK, resistant against ageing and weather |
| Less suitable for: | mineral oil, greases, fuels |
| FPM (Viton) | |
| Colour: | brown red |
| Temperature resistance: | -20 up to 120 degree C |
| Suitable for: | oil, grease, acids, alkalies, petrol, bencene, ozone, many solvents, very high resistance against chemicals, heat and ageing |
| Less suitable for: | steam, detergents like acetone and MEK, more expensive than the above mentioned materials |
U-shaped
seals made of CR (Neoprene) and Teflon (PTFE) on request. |