Oxidized Bitumen 85/25 – Softening point ≈ 85 °C, penetration ≈ 25 dmm. A go‑to grade for hot‑applied roof mastics and waterproofing boards when balanced flow resistance and workability are required.

Oxidized Bitumen 90/15 – Softening point ≈ 90 °C, very low penetration ≈ 15 dmm. Extra‑hard and heat‑resistant; favored for pipe coatings and industrial adhesives that face sustained high temperatures.

Oxidized Bitumen 95/25 – Softening point ≈ 95 °C, penetration ≈ 25 dmm. Offers a middle‑ground blend of stiffness and flexibility, making it suitable for both roofing mastics and floor sealants.

Oxidized Bitumen 105/35 – Softening point ≈ 105 °C, penetration ≈ 35 dmm. Maintains integrity under wide hot‑cold cycles while remaining less brittle; ideal for heavy‑duty industrial floors and structural expansion joints.

Oxidized Bitumen 115/15 – Softening point > 115 °C, penetration ≈ 15 dmm. The hardest variant: delivers outstanding shape stability and chemical resistance for extreme‑temperature equipment linings and load‑bearing surfaces.

In short, oxidized bitumen grades are defined by their softening‑point / penetration pair. Higher softening points and lower penetration values mean greater hardness and heat resistance, while slightly higher penetration numbers give a bit more flexibility where thermal cycling is severe.