This SAE Recommended Practice establishes uniform test procedures for the defrosting systems of enclosed cab trucks, buses, and multipurpose vehicles. It is limited to tests that can be conducted on uniform test equipment in commercially available laboratory facilities. Current engineering practice prescribes that for laboratory evaluation of defroster systems an ice coating of known thickness be applied to the windshield to provide more uniform and repeatable test results, even though under actual conditions such a coating would necessarily be scraped off before driving. The test condition, therefore, represents a more severe condition than the actual condition, where the defroster system must merely be capable of maintaining a cleared viewing area.
SAE J381-1974 history
2020SAE J381-2020 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE - TRUCKS@ BUSES@ AND MULTIPURPOSE VEHICLES
2009SAE J381-2009 Windshield Defrosting Systems Test Procedure and Performance Requirements Trucks, Buses, and Multipurpose Vehicles
2000SAE J381-2000 (R) Windshield Defrosting Systems Test Procedure and Performance Requirements - Trucks, Buses, and Multipurpose Vehicles
1994SAE J381-1994 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE—TRUCKS, BUSES, AND MULTIPURPOSE VEHICLES
1984SAE J381-1984 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE - TRUCKS@ BUSES@ AND MULTIPURPOSE VEHICLES
1974SAE J381-1974 WINDSHIELD DEFROSTING SYSTEMS TEST PROCEDURE—TRUCKS, BUSES, AND MULTIPURPOSE VEHICLES
1968SAE J381-1968 Windshield Defrosting Systems Test Procedure - Trucks@ Buses@ and Multipurpose Vehicles