Blue-Gard® 3700 Gaskets
Blue-Gard® 3700 Gaskets.
An asbestos-free aramid fibre gasket sheet with an EPDM binder, rated to 205°C continuous and 83 bar for water and mild chemical service.
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Material |
Aramid fibres with EPDM binder, asbestos-free |
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Colour |
Grey-black |
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Fluid services |
Water, mild chemicals and saturated steam (see steam note above) |
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Temperature range |
-73°C to +205°C continuous, +371°C absolute maximum |
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Maximum pressure |
83 bar |
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P × T (max.) |
12,000 bar × °C (1/32″ and 1/16″) / 8,600 bar × °C (1/8″) |
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Compressibility (ASTM F36) |
10% average |
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Recovery (ASTM F36) |
40% |
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Creep relaxation (ASTM F38) |
25% |
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Tensile strength, across grain (ASTM D1708) |
15 N/mm² |
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Density (ASTM F1315) |
1.6 g/cm³ |
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Thermal conductivity (ASTM F433) |
0.29 to 0.38 W/m·K |
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Leakage, Fuel A (ASTM F37B) |
0.3 ml/hr at 3.5 N/mm² gasket load |
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Leakage, nitrogen (ASTM F37B) |
0.7 ml/hr at 20.7 N/mm² gasket load |
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Leakage, nitrogen (DIN 3535) |
0.04 cc/min at 32 N/mm² gasket load and 40 bar |
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Preferred assembly stress |
41 to 69 N/mm² |
Every gasket is cut to order, from single prototypes through to full production runs. Send us your drawing or dimensions and we will come back with a quotation.
Why choose Blue-Gard® 3700 for water and mild chemical sealing?
Blue-Gard 3700 is built from aramid fibres in an EPDM binder, which gives a strong sheet with a tensile strength across the grain of 15 N/mm². EPDM suits water-based media, and the data sheet lists water and mild chemicals as the main fluid services. The continuous maximum temperature is 205°C, with an absolute maximum of 371°C, and the pressure limit is 83 bar. The minimum temperature rating is -73°C, which the data sheet describes as conservative.
Compressibility averages 10% with 40% recovery, and creep relaxation is 25%. That last figure means the joint can lose some bolt load over time, so re-torquing before the system is pressurised matters. Thermal conductivity is low, at 0.29 to 0.38 W/m·K.
Thickness affects the working limits. The maximum pressure × temperature rating is 12,000 bar × °C for 1/32″ and 1/16″ sheet and 8,600 bar × °C for 1/8″ sheet, and 1/16″ is strongly preferred. The sheet also performed well in leakage testing, at 0.3 ml/hr with Fuel A under a 3.5 N/mm² gasket load.
For further information on our services or to discuss your requirements, contact us today.
