To determine surface finish requirements, consult the OEM repair manual. Surface Finish Requirements Cross-Section Through C#SC Assembly SPIRAL WOUND GASKET Gasket Description Gasket Cross Section Flange Surface Finish Microinch Ra Flange Surface Finish Micrometer Ra Spiral Wound Gasket 125 - 250 3.2 - 6.3 Kammprofile Gasket 125 - 250 3.2 -6.3 Metal Jacketed Gaskets 100 … The company’s story began in 1879, when it started trading in gaskets and other technical products. marks are practically impossible to seal regardless of the type of gasket used. The picture shows a serrated finish on a Raised Face. It is squeezed between the mating surfaces as they are clamped or bolted together. `A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. b) Spiral Wound Gasketing. to .0015?) Facing Material Max. Rescue Gasket, which ensure we are able to continually meet the ever more stringent requirements of our customers. Surface roughness can be measured using a profilometer. Most MLS gakets we came across when they first came out, called for a very fine finish. The surface finish that’s required will depend on the type of head gasket. MSS SP-6-2017 covers the types of contact faces, such as flat face or ring joint, as well as the contact face materials, including steel, ductile iron, gray iron, and bronze, of pipe flanges. Though Ra (Roughness Average) has traditionally been used to describe surface finish, most gasket engineers today say a more accurate perimeter is Rz, which is the average difference between the peak height and valley depth. • If the surface is too smooth, the gasket will have less “grip” and may leak. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. For many years, most aftermarket gasket manufacturers have recommended a head gasket surface finish of 55 to 110 micro-inches RA (roughness average), or 60 to 125 RMS (root mean square). Most of the world’s major automobile manufacturers put their trust in our exceptional quality and reliability. It also allows a defect in the flange surface finish of between 0.06 and 0.25 inches deep, with the same radial width. To determine surface finish requirements, consult the OEM repair manual. This “bite” aids the gasket in resisting the effects of internal pressure, creep and cold flow. For tongue and groove flange facings or for very thin gaskets (0.4mm or below), a surface finish of 1.6mm to 6.3mm Ra (63 to 200 in. It is intended for applications for which ASME B16 Standards do not contain complete facing finish requirements. The cutting tool empolyed has an approximate 0.06 in. A surface finish of 1.6mm to 6.3mm Ra (63 to 200 in. Surface finishes below 1.6mm are not recommended due to their negative effect on creep resistance of the gasket. Flat Ring Gaskets. Kistner: Cometic does not recommend the reuse of any head gasket as there is an issue with trying to define what a use is. The preferred range has traditionally been 80 to 100 RA. Fel-Pro gaskets are designed specifically to accommodate the surface finish requirements for each application. Surface finishes below 1.6mm are not recommended due to their negative effect on creep resistance of the gasket. or larger radius. Flexitallic® Safe Over the last century, our aggressive R&D efforts have helped customers become Flexitallic® Safe. The flat gasket is the oldest and most popular way to seal a flange or joint. Finish is a critical aspect of gasket performance with lowest leakage resistant to over compression crushing. The gasket will have a difficult time conforming to surface imperfections and may leak 80 to 100 Ra flanges! 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