Oxidized bitumen 75/25 carries the same 20 to 30 dmm penetration as 85/25, the world’s volume roofing grade, but sits roughly 10 °C lower on the softening scale. That makes it the cheapest medium-hardness blown grade available — and the one that should only be bought when the climate genuinely allows it. In cool markets and […]
Oxidized bitumen 75/35 sits at the very bottom of the blown range, and that position defines it. With a softening point of 70 to 80 °C and 30 to 40 dmm penetration, it is only modestly harder than the penetration grade it started from. For roofing that makes it a limited product. For cable impregnation, bituminous […]
Oxidized bitumen 85/25 is the most widely produced blown grade in the world. If a roofing membrane factory anywhere buys one oxidised grade, this is usually it. That popularity is deserved — it balances heat resistance and workability at the lowest cost in the range — but it also means 85/25 gets specified by default […]
Oxidized bitumen 85/40 is the softest grade in the blown range that still carries a useful softening point, and it exists for one reason: cold climates. At 80 to 90 °C softening point with 35 to 45 dmm penetration, it is the grade that lets a membrane sheet be unrolled and folded in a Russian, Scandinavian […]
Oxidized bitumen 90/10 is an unusual grade and the reason is in the numbers. At 85 to 95 °C softening point with only 5 to 15 dmm penetration, it is harder than 105/15 while sitting 15 °C lower on the softening scale. Most blown grades trade hardness against heat resistance in a predictable ratio. 90/10 breaks that […]
Oxidized bitumen 90/15 is the middle grade of the 90 series, and middle grades are usually the ones buyers understand least. It is firmer than 90/40 and softer than 90/10 — too rigid for membrane, not hard enough for pipe coating enamel. What it is good at is the work that sits between those two: […]
Oxidized bitumen 90/40 is the most flexible grade in the blown range that still holds a useful softening point. At 85 to 95 °C softening point with 35 to 45 dmm penetration, it sits at the soft corner of what air blowing produces. That makes it the membrane grade for temperate and cool climates, and the […]
Oxidized bitumen 95/25 is the grade buyers reach for when 85/25 is not quite enough and 105/35 costs more than the project needs. It carries the same 20 to 30 dmm penetration as the world’s volume roofing grade but adds roughly 10 °C of softening point. In a market where summer roof surfaces touch 80 °C, that […]
Oxidized bitumen 105/35 occupies the most useful position in the blown bitumen range: a softening point around 105 °C with a penetration of roughly 35 dmm. That combination is unusual and it is the whole point of the grade. Most binders that resist 105 °C are brittle at ambient temperature. This one is not. It is the […]
Oxidized Bitumen 115/15 — also referred to as Blown Asphalt 115/15 or Blown Bitumen 115/15 — is a hard-grade industrial bitumen produced through a controlled air-blowing process applied to vacuum-bottom petroleum bitumen at temperatures exceeding 250 °C. The designation “115/15” directly encodes its two defining parameters: a ring-and-ball softening point of 115 °C and a penetration value […]
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