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MRATs - Construction
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MRAT - Model Risk Assessment Introduction
MRATs
This edition (2016) is the sixth full version; it takes into account the reclassification of some substances and changes in nomenclature and values of exposure limits. These changes have not had much effect on the risk assessments because, in those cases where the revision was an increased hazard, the substance was already handled with maximum precautions.
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MRAT - 5.001 - Adhesives: Acrylics Cement and Pipe Sealants
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Spreading cement on joint surfaces; pouring from a large stock container to smaller ones. Sealing metal joints in plumbing.‘Liquid PTFE’ does not contain PTFE; it is a flexible setting sealant used in plumbing on metal threads as an alternative to PTFE tape. Formulations vary but some contain methacrylates, acrylic acid and organic peroxides.
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MRAT - 5.002 - Adhesives: Reactive Resins, Epoxy, Polyester
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This wide range of epoxy adhesives and polyester resins is produced mostly as two-component systems. Curing is effected by the reactions of a resin and a hardener. Epoxy resins are used for the bonding of metals, ceramics, glass, rubber, plastics, wood, etc. Polyester resin has useful applications where glass fibre is involved and for bonding ceramics, some metals and rubbers.In construction courses, epoxy adhesives are most likely to be used in small scale repair work.
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MRAT - 5.003 - Adhesives: Reactive Resins, Formaldehyde
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These adhesives are essentially a resin bonding agent (liquid or powder) which sets as a result of chemical action with a hardener. A catalyst may be added to accelerate setting at room temperature.In construction courses, reactive resin formaldehyde adhesives are most likely to be used in woodworking applications where a waterproof adhesive is required.
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