Handbook of Adhesives and Sealants

688 Chapter Seventeen Nature and type of environment Cyclic effects of stress and environment (rate and period) Time of exposureIn applications where possible degrading elements exist, candidate adhesivesmust be tested under simulated service conditions. Standardlap shear tests, such as ASTM D 1002, which use a single rate ofloading and a standard laboratory environment, do not yield optimalinformation on the service life of the joint. Important information suchas the maximum load that the adhesive joint will withstand for extendedperiods of time and the degrading effects of various environmentsare addressed by several test methods. Table 17.2 lists commonASTM environmental tests that are often reported in the literature.A more complete list of standard ASTM test methods may be foundin Appendix C.Time and economics generally allow only short term tests to verifythe selection of the adhesive system relative to the environment. It istempting to try to accelerate service life in the laboratory by increasingtemperature or humidity, for example, and then to extrapolate theresults to actual conditions. However, often too many interdependentvariables and modes of strength degradation are in operation, and aTABLE 17.2 ASTM Test Method for Determining Environmental Resistance ofAdhesives and SealantsTitleMethodAtmospheric Exposure of Adhesive Bonded Joints and Structures,Recommended Practice for ..................................... ASTM D 1828Exposure of Adhesive Specimens to High Energy Radiation,Recommended Practice......................................... ASTM D 1879Integrity of Glue Joint in Structural Laminated Wood Products forExterior Use, Test for .......................................... ASTM D 1101Resistance of Adhesives to Cyclic Laboratory Aging Conditions,Tests for ...................................................... ASTM D 1183Effect of Bacteria Contamination on Permanence of AdhesivePreparations and Adhesive Bonds............................... ASTM D 1174Effect of Moisture and Temperature on Adhesive Bonds, Tests for ASTM D 1151Effect of Mold Contamination on Permanence of AdhesivePreparations and Adhesive Bonds, Test for ...................... ASTM D 1286Resistance of Adhesive Bonds to Chemical Reagents, Test for ..... ASTM D 896Strength Properties of Adhesives in Shear by Tension Loading inthe Temperature Range of 450 to 57F,Testfor............... ASTM D 2557Strength Properties of Adhesives in Shear by Tension Loading atElevated Temperatures, Test for ................................ ASTM D 2295