Oxidized Bitumen 85/40—also known as Blown Asphalt 85/40—is a premium-grade, high-softening point bitumen engineered for industrial applications requiring thermal resistance, rigidity, and long-term performance. It is frequently used in bituminous coatings, roofing felts, pipe wrapping, and sealants where weathering resistance and dimensional stability are critical.
This blog provides a full technical breakdown of Blown Asphalt 85/40, including its performance data and best-use scenarios in construction, industrial, and waterproofing applications.
Oxidized Bitumen 85/40 is a semi-solid bituminous compound manufactured through the air-blowing process, in which hot bitumen is exposed to controlled air flow to increase the asphaltene content. This process results in a higher softening point and lower penetration value—ideal for hot-climate, high-load, or solvent-based applications.
With a softening point of ~85°C and penetration of ~40 dmm, 85/40 offers a unique combination of high temperature resistance and moderate flexibility, suitable for industrial-grade construction and insulation systems.
Oxidized Bitumen 85/40’s combination of high softening point and moderate flexibility makes it ideal for bridge joints, road expansion joints, and airport runways. It can expand and contract with the substrate, minimizing cracks and material fatigue.
Oxidized Asphalt 85/40 is widely used in the production of bitumen-based paints, primers, and corrosion-resistant coatings for:
Steel structures
Storage tanks
Oilfield equipment
Its chemical inertness and long-lasting film-forming ability make it ideal for protection in harsh environments.
Due to its rigidity and low water permeability, Blown Bitumen 85/40 is commonly used in membrane manufacturing, basement and substructure waterproofing, and tunnel linings where water ingress resistance is essential.
Blown Asphalt 85/40 is used in hot-applied pipe coating systems, either on its own or in combination with felt, fiberglass, or aluminum wraps. It provides superior adhesion, dielectric strength, and mechanical durability in buried or exposed conditions.
Its thermoplastic behavior makes it a perfect base for manufacturing waterproof roofing sheets, bitumen shingles, and polymer-modified bitumen (PMB) membranes.
In HVAC, refinery, and industrial insulation systems, Oxidized Asphalt 85/40 is used as a sealing and adhesive compound. It acts as a barrier to heat, vapor, and moisture, preserving energy efficiency and reducing condensation.
✅ High Softening Point (85°C): Prevents flow or sag under intense heat
✅ Moderate Penetration (40 dmm): Allows for slight movement and flexibility
✅ Excellent Adhesion: Bonds to most substrates including concrete, metals, and wood
✅ High Chemical Resistance: Inert to acids, alkalis, and salts
✅ Aging Stability: Performs consistently over years of exposure
✅ Solvent Compatibility: Easily dissolves in trichloroethylene and industrial thinners
Blown Asphalt 85/40 used in expansion joints, waterproofing membranes, pipe coatings, and bituminous paints where high softening point and flexibility are both needed.
Oxidized Bitumen 85/40 has higher flexibility than 85/25 and 85/30, making it suitable for flexible coatings and movement joints, while the latter are better for rigid waterproofing or insulation.
Yes. Blown Asphalt 85/40 designed for multiple heating cycles without significant degradation, provided temperatures do not exceed the flash point (>250°C).
Yes. With 99% solubility, it is widely used in solvent-based paints, mastics, and anti-rust coatings.
Common packaging includes:
25 kg meltable PE or paper bags
180 kg steel drums
Block form on pallets for bulk use
Custom export packaging for container loading
Oxidized Bitumen 85/40 stands out as a reliable and versatile industrial material for high-temperature, high-performance environments. Its moderate penetration and high softening point make it particularly effective in joint sealants, coatings, and waterproofing solutions where minor flexibility is needed without sacrificing rigidity.
It resists weathering, aging, and chemical attack while delivering excellent adhesion to a wide range of substrates. Whether you’re sealing a bridge joint, producing roofing membranes, or formulating corrosion-resistant coatings, Bitumen 85/40 is a smart, durable solution. Its adaptability across industries makes it one of the most in-demand grades in the oxidized bitumen family.
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