Straub Coupling Sealing Sleeve Materials
Straub Couplings can be supplied with a number of different sealing sleeve materials. The temperature range and fluids for which each material is suitable is given in the table below. See the individual tables below for the sealing sleeves available with each coupling type.
Material Temperature Range Fluids
| EPDM |
-30°C to +100°C all qualities of water, waste water, air, solids and chemical products |
| NBR |
-20°C to +80°C water, gas, oil, fuel and other hydrocarbons |
| H-NBR |
-20°C to +125°C water, gas, oil and fuel and other hydrocarbons |
| FPM/FKM |
-20°C to +180°C ozone, oxygen, acids, gas, oil & fuel (only with strip insert) |
Straub Coupling Material Grades
| W1 |
Hot Dipped Galvanised Casing Bolts and Bars |
| W2 |
Stainless Steel Casing, Mild Steel Bolts and Bars |
| W4 |
304 Grade Stainless Steel casing, 316 Grade Bolts and Bars |
| W5 |
316 Grade Casing, Bolts and Bars |
| W5 LDX |
Duplex Stainless Steel Casing, 316 Grade Bolts and Bars (Only available on Flex, Step-Flex & Open-Flex LV Versions) |
