Characteristics of Bonded Washer Seals
Ideal Pressure Gasket
Reliable sealing at high & low pressure
High & low temperature capability
Reduced bolt torque with no loss of tightening loads
Metal ring prevents over compression of the rubber seal
Properties and Description
Our bonded washers consist of a metal rectangular outer washer with a trapezoid shaped rubber ring bonded to the inner of the ring creating a 1-piece washer with an internal seal. Bonded washers hold a large amount of burst pressure whilst retaining the inner seal shape and limiting deformation resulting in brilliant sealing under high pressures.
EMI Seals & Gaskets Ltd can supply either the Standard style or a Self-Centering style that eliminates the potential of the being slightly seal offset during installation thus simplifying the process. These seals are readily available in Imperial sizes from 1/8 inch to 3 inches. French and German Metric form part of our extensive stock. Imperial and metric size charts can be found at the top of our data sheets below. The inner bonded rubber seal can be manufactured to suit the end user’s application from the following:EMI Material ReferenceElastomer NameStandard Elastomer Hardness Shore A 301Silicone (VMQ)75°±5 SHORE HARDNESS 302Fluorosilicone (FVMQ)75°±5 SHORE HARDNESS 309Nitrile (NBR)85°±5 SHORE HARDNESS 309-2Hydrogenated Nitrile (HNBR)80°±3 SHORE HARDNESS 303Fluorocarbon (FKM)75°±5 SHORE HARDNESS 306EPDM (EPDM)85°±5 SHORE HARDNESS Other custom shore hardness’s are available depending on order quantity
Bonded Washer Thermal Properties
The thermal properties of the bonded washer seals will depend on the specific grade of compound used, please consult compound data sheets or contact a member of our Technical or Relationship Management Teams to discuss a potential project or application in greater detail.
Metal washer can be manufactured to suit the end user’s application from the following:METALTENSILE STRENGTH MN/m2 (MINIMUM)SPECIFICATION Mild Steel Pressings540BS 1449 Part 1 CS4 BRH5 Mild Steel Turned540BS 970 Part 1 EN8 Stainless Steel Pressings540BS 1449 Part 2 T316 Stainless Steel Turned540BS 970 Part 1 T303 Stainless Steel Turned540BS 970 Part 1 T316 Stainless Steel Turned540BS 970 Part 1 T304
Our Bonded Washer Seals are available with a variety of surface finishes:SURFACE FINISHSPECIFICATION Zinc platingDef. STAN. 03-20 Gold PassivateDef. STAN. 03-33 Cadmium PlatingDef. STAN. 03-19 Chromic AnodiseDef. STAN. 03-24/2 Sulphuric AnodiseDef. STAN. 03-25/2 Clear PassivateFe/Zn-5CIA Zinc/Cobalt and Colour PassivateZnCb-921/ST140 Mechanical Zinc PlateSTD.5735,114 Fe/Zn 8 C1 Zinc/Iron and Black ChromateFe/Zn - Fe 5 C4 Sherardize 2000SHS 1091