Elastomer seal: >1 x 10-8 mbar - High vacuumMetal seal: >1 x 10-11mbar- UHV
Viton: -20ºC to 200ºCBuna: -30ºC to 110ºCMetal seal: -270˚C to 150˚C
Nominal OD sizes:
ISO-63 to ISO-500
All dimensions are in inches (mm) & weights are in pounds (kg), unless otherwise noted.
ISO flanges and hardware
Nor-Cal ISO flanges and hardware are manufactured to the International Standards Organisation specification so they can be mated to other manufacturers’ ISO flanges. ISO flanges are made from Argon Oxygen Decarburisation (AOD) 304 stainless steel. This material is certified to meet ASTM-240 and has less than 0.01% sulfur in order to prevent sulfur stringers. Grain size is 3 to 6 per ASTME-112.
Maximum inclusion size is 2.5 per ASTM E-45. Normally our standard material is in the low carbon range for 304 stainless steel. For increased corrosion resistance, some sizes are available from stock in 316L stainless steel.
Optional fastener and non rotatable ISO flanges are available from stock for 21/2 to 20 inch (63.5-508mm) tube sizes.
Both use a Viton O-ring, held in place by a centering ring, to effect a seal with a vacuum range of 10-8 mbar. ISO components can be baked to 204ºC.
ISO flanges can also be used with standard clamps and alluminum seals to obtain a UHV seal bakeable to 150ºC. Seals are described in detail in Section 2.1 of our catalogue.
ISO Flange Assembly Instructions
Optional fastener flanges are joined around the periphery with clamps. Double claw clamps are used when a pair of OF flanges are joined (See diagram A.), or single claw clamps are used to join an OF flange to a tapped nonrotatable on a pump or gate valve. (See diagram B.) This fastening method allows the OF flange to be rotated for ease of component alignment. Additionally, a rotatable bolt ring can be used to fasten an OF flange to a nonrotatable flange using bolts. (See diagram C.) A retainer ring prevents the OF flange from slipping through the bolt ring. Nonrotatable ISO flanges are assembled with bolts. (See diagram D.) They do not allow rotation of bolt holes on mating flanges to align components.