(edited 6/25/14 CEB) The intent is to revise the scope of ASTM D1709 to allow dart weights above 2 Kg for both test methods A and B. Improvements in polymer performance and availability have resulted in plastic films with impact resistance greater than 2 Kg. A task group within subcommittee D20.19 was set up to discuss potential technical issues around the use a heavier darts and determine what weight limits, if any, should be included in this standard. Consensus was to move ahead with a weight increase to 6Kg. Modifications to the test apparatus to use a heavier dart are likely minimal, but may need to be defined in future revisions of the standard. This revision is also necessary to address a contradiction with the requirements of ASTM E1745-11 Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs. Performance class A as listed in Table 1 of that standard requires a minimum Impact Resistance of 2.2 Kg.
Keywordsdrop dart; impact; plastic film; Free-falling dart method; Impact resistance--plastics; Plastic sheet and film; Polyethylene (PE) sheet and film;
Draft Under Development