ASTM D6383-99(R2021) pdf free download

ASTM D6383-99(R2021) pdf free download.Standard Practice for Time-to-Failure (Creep-Rupture) of Adhesive Joints Fabricated from EPDM Roof Membrane Material
1. Scope
1.1 This practice covers sample preparation temperatures, test parameters, and specimen exposure conditions that are applicable when Test Method D5405/D5405M is used for conducting time-to-failure (creep-rupture) tests of adhesive joints fabricated from ethylene-propylene-diene terpolymer (EPDM) roof membrane material. 1.2 This practice is applicable to joints fabricated in the laboratory from EPDM roof membrane materials and adhe- sives received from suppliers, and to joints prepared from EPDM seams sampled from field installations. 1.3 The joints are bonded using preformed tape or liquid- based adhesives, and EPDM roof membrane materials that are non-reinforced, fabric- or scrim-reinforced, and fabric backed. Primers are also used as recommended for the specific adhe- sive. 1.4 This practice contains notes that are explanatory and are not part of the mandatory requirements of this practice. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions—For definitions of terms used in this practice, refer to Terminologies D907 and D1079. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 creep-rupture test—a test that measures the time-to- failure of a specimen subjected to a constant load; progressive specimen deformation may also be measured. 3.2.2 failure—rupture of the bond resulting in complete separation of its adherents under the test conditions; or, alternatively, rupture of the membrane material away from the bonded section of the test specimen (that is, material rupture). 3.2.3 time-to-failure—the period of time beginning when a joint specimen is placed under load and ending when failure occurs.
4. Summary of Practice
4.1 Adhesive joints are prepared in the laboratory at ambi- ent and low temperatures using tape or liquid adhesives and EPDM roof membrane material. Creep-rupture tests are then conducted in accordance with Test Method D5405/D5405M before and after subjecting these joints to artificial exposure in the laboratory. The loads are applied in either peel or shear configurations at ambient and elevated temperatures. Table 1 summarizes the preparation temperatures, test parameters, and exposure conditions incorporated in this practice. Alternatively, adhesive joints are prepared from EPDM seams sampled from roofs in service, and then subjected directly to creep-rupture testing.
5. Significance and Use
5.1 An important factor affecting the performance of seams ofEPDM membranes is their ability to remain bonded over the membrane’s expected service life. Time-to-failure tests provide a means of characterizing the behavior of joints under constant load over time. N OTE 1—Table 1 is based on the results of an industry government consortium study on creep-rupture resistance (time-to-failure) of EPDM adhesive joints. 4,5 Referral to Footnotes 4 and 5 provides typical time-to- failure data, developed under the conditions in Table 1, for EPDM joints fabricated in the laboratory with non-reinforced EPDM roof membrane material, butyl-based tapes, and liquid adhesives. It is noted that the peel load specified in this practice is 9.8 N [2.2 lbf]. The peel load under which the tests described in Footnotes 4 and 5 were conducted was 9.3 N [2.1 lbf]. A load of 9.8 N [2.2 lbf] corresponds to 1 kgf [2.2 lbf], and dead weights of 1-kg [2.2-lbm] mass are available through laboratory equip- ment supply houses. Similarly, a load of 29.4 N [6.6 lbf] corresponds to a dead weight of 3-kg [6.6-lbm] mass. 5.2 Time-to-failure tests complement other mechanical tests such as strength for characterizing joints of EPDM roof membranes, and can be incorporated in specifications for adhesives for joining EPDM roof membrane material. 5.3 This practice, which is specific to EPDM joints, comple- ments Test Method D5405/D5405M that provides general requirements for the preparation and creep-rupture testing of joints fabricated from any nonbituminous organic roof mem- brane material.