Similar International Standards
ASTM D312-15(2021)ASTM International (US)
HighCurrent
Standard Specification for Asphalt Used in Roofing
Specifies several types of oxidized asphalt for use in built-up roofing, very similar to IS 702's industrial applications.
EN 13304:2009CEN (European Committee for Standardization)
HighCurrent
Bitumen and bituminous binders - Framework for specifying oxidized bitumens
Provides a framework for classifying and specifying oxidized bitumens based on softening point and penetration, directly parallel to the IS 702 approach.
ASTM D449-03(2022)ASTM International (US)
HighCurrent
Standard Specification for Asphalt Used in Dampproofing and Waterproofing
Covers oxidized asphalt specifically for dampproofing and waterproofing, a primary end-use for industrial bitumen under IS 702.
Key Differences
≠Grading Nomenclature: IS 702 uses a dual-number system based on softening point and penetration (e.g., 85/25). ASTM D312 and D449 use 'Types' (e.g., Type I, II, III) which are defined by property ranges and intended application, not by the property values themselves in the grade name.
≠Ductility Test Temperature: IS 702 specifies the ductility test to be conducted at 27°C (as per IS 1208). In contrast, ASTM standards (like D312) typically specify the ductility test at 25°C. This difference in test temperature can affect the results and comparability.
≠Specific Property Limits: While the parameters tested are similar, the acceptable limits can vary. For example, for a comparable grade, the maximum Loss on Heating is 0.5% in IS 702 (Grade 85/25), whereas it is 1.0% in ASTM D312 (Type III).
≠Number and Range of Grades: IS 702:2017 defines 5 primary grades with specific property windows. ASTM D312 specifies 4 Types, and ASTM D449 specifies 3 Types, which may not directly map to all the grades available in the Indian standard.
Key Similarities
≈Basis of Classification: Both IS 702 and its international equivalents (ASTM D312, EN 13304) fundamentally classify oxidized bitumen based on its key rheological properties: Softening Point and Penetration.
≈Core Test Parameters: All standards mandate testing for a common set of critical properties, including Softening Point, Penetration, Ductility, Loss on Heating, and Solubility, indicating a global consensus on quality assessment.
≈Material Scope: The standards are all intended to cover industrial-grade bitumen produced through the process of blowing air through petroleum residuum at elevated temperatures (i.e., oxidized or blown bitumen).
≈Inclusion of Safety Parameter: IS 702 and its counterparts consistently specify a minimum Flash Point (determined by Cleveland Open Cup), which is a crucial safety requirement for handling and application at high temperatures.