Lengthy research with field testing has enabled Busak+Shamban tosuccessfully bond seals to metal - offering major performanceadvantages for users in the chemical and processing industries(CPI).
Sealing devices incorporating a rubber lip, pad or membrane,bonded to a metal component, have traditionally posed designproblems when FFKM perfluoroelastomer is required. The material ischosen for its high-temperature and chemical resistance and isfrequently used in conjunction with static edge-bonded gaskets ordynamic piston and valve devices in critical applications. However,due to the chemical resistance of perfluoroelastomer materials, useof conventional glue-bonding does not provide certainty of sealingintegrity, essential in critical CPI applications.
The new development uses Busak+Shamban Isolast® FFKM materialsand enables successful bonding to a wide range of surfaces,including stainless and mild steel, aluminium, brass and variousplastics.
The bonding action achieved with the Isolast® materials does notcompromise the physical performance properties nor the generalchemical resistance of the perfluorelastomer. Both laboratory andfield testing show bond integrity to be greater than the tensilestrength of the perfluoroelastomer itself. In addition, immersiontests in a range of chemicals, including acetic acid, Methyl EtherKetone (MEK) and sulphuric acid at elevated temperatures, show thebond to be resistant to chemical attack. In fact, bond strength isproven to be equally as high, following immersion, as it was beforethe soak tests began.
Medical, pharmaceutical, food and beverage industries haveadopted this advanced sealing technology from Busak+Shamban withseals now manufactured from the Isolast® FDA approved grade J9515material, bonded to stainless steel to eliminate the problemsassociated with groove voids. Bacterial build up and subsequentcontamination has been eliminated and the severe cleaning fluidsrequired within CIP/SIP processes may be used with completeconfidence.
In cases where space is at a premium, the bonded seal is oftenthe preferred option, and the Isolast development now makes itpossible to use FFKM materials. Further benefits derived frombonding to metal components using Isolast® perfluoroelastomerinclude less parts to be handled and stored, a smaller overallcomponent and resultant increased speed in sub-system assembly.Recent application examples have shown the use of Isolast®perfluoroelastomer bonded seals to offer a full 50% cost savingwhen replacing conventional sealing arrangements. Furthermore,although the seal is smaller, the design can achieve improvedsealing performance.