IS 3698:1991 Part 1 is the Indian Standard (BIS) for bitumen mastic for roofing and waterproofing - part 1: general requirements. This standard lays down the general requirements for bitumen mastic used in roofing and waterproofing, specifying material composition, physical properties, and conformity testing for durability against water ingress.
Specifies general requirements for bitumen mastic used for roofing and waterproofing.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Bitumen Content (% by mass) | 14.0 to 17.0 % | 10.0 to 15.0 % | ASTM D491-17 |
| Hardness Number (Indentation in 0.1mm at 25°C) | 8 to 20 (for Grade 1) | 15 to 40 (for a typical roofing grade, e.g. MA-R-H) | BS EN 12970:2000 |
| Coarse Aggregate Content (% of total mineral matter) | 40 to 50 % (retained on 2.36 mm sieve) | 20 to 35 % (retained on 2.36 mm sieve) | ASTM D491-17 |
| Fine Aggregate Content (% of total mineral matter) | 50 to 60 % (passing 2.36 mm sieve) | 65 to 80 % (passing 2.36 mm sieve) | ASTM D491-17 |
| Softening Point of Binder (°C) | 80 to 100 °C (for recommended S90 grade bitumen) | 60 to 77 °C | ASTM D491-17 |
| Mineral Matter Soluble in Acid (as CaCO3) | Not less than 98% for limestone aggregate | Not less than 95% for limestone or dolomite | ASTM D491-17 |