Oxidized Bitumen 85/25 is a hard-grade blown bitumen designed for applications requiring high softening point and reduced flow.
With its superior thermal resistance, water repellency, and adhesive strength, it is ideal for waterproofing, corrosion protection, road construction, and insulation systems.
This guide explores the technical characteristics, industrial applications, and usage recommendations of Blown Asphalt 85/25 in full detail.
Oxidized Bitumen 85/25, also referred to as Blown Asphalt 85/25 or Bitumen 85/25, is a refined bituminous product produced by passing air through hot bitumen in a controlled oxidation process. The result is a highly viscous, semi-solid material with increased softening point (85°C) and lower penetration (25 dmm).
These properties make it highly resistant to deformation under heat and pressure, and thus suitable for demanding environments like hydraulic structures, anti-corrosive coatings, and industrial sealing.
Oxidized Bitumen 85/25 is engineered for heavy-duty performance in high-temperature and chemically exposed environments. Below are the primary sectors and use cases.
Bitumen 85/25 forms a solid waterproof barrier for below-grade foundations, basements, and retaining walls. Its low penetration ensures long-term performance, especially in hydrostatic pressure zones. It is applied hot, creating seamless protection against ground moisture and vapor ingress.
In chemical processing plants, Oxidized Asphalt 85/25 is used to line reactor vessels, settling tanks, and secondary containment systems. Its chemical stability resists:
Alkaline spills
Acid vapors
Solvent exposure
Bitumen 85/25 also serves in bituminous enamel coatings for industrial-grade chemical insulation.
Blown Asphalt 85/25 is a key ingredient in anticorrosion coatings for steel pipelines, tanks, ducts, and metal girders. When combined with reinforcing wraps or glass fabric, it provides long-lasting, dielectric shielding against:
Soil corrosion
Electrochemical attack
Moisture intrusion
Thanks to its hardness and high softening point, 85/25 is used in bridge decks, road expansion joints, and asphalt block sealing. It prevents:
Crack propagation
Joint migration
UV and heat degradation
Blown Asphalt 85/25 also blends well with rubber modifiers for enhanced elasticity.
Oxidized Bitumen 85/25 is used to coat insulation slabs, pipes, and HVAC ducts. It acts as a thermal barrier and moisture seal, especially in:
Oil refineries
Petrochemical plants
Thermal power facilities
Its high purity and hardness make it suitable for solvent-based paints, metal primers, and protective bituminous lacquers. It improves:
Film toughness
UV resistance
Water impermeability
These coatings are widely used in marine and industrial equipment.
✅ High Softening Point (85°C): Resists melting and deformation in hot climates
✅ Low Penetration (25 dmm): Ensures mechanical strength and long-term hardness
✅ Excellent Chemical Resistance: Withstands acids, alkalis, and salts
✅ Non-Tacky Finish: Reduces dirt pickup, ideal for exposed coatings
✅ Superior Adhesion: Binds well to steel, concrete, and masonry
✅ Low Water Absorption: Optimal for foundation and tank applications
It represents a softening point of 85°C and a penetration value of 25 dmm, indicating high heat resistance and rigidity. It’s suitable for coatings, sealing, and protective linings.
Yes, especially in joint sealing, crack filling, and bituminous pre-coats. However, it’s not ideal for flexible asphalt mixes due to its hardness.
Absolutely. It withstands alkaline, acidic, and saline environments, making it perfect for chemical storage and waste treatment applications.
Oxidized Asphalt 85/25 has a higher softening point and lower penetration, making it harder and more suitable for thermal and chemical exposure, while Blown Asphalt 75/30 is more flexible and versatile.
It should be stored in dry conditions, away from UV exposure and humidity. When kept properly, its shelf life exceeds 5–10 years without degradation.
Bitumen 85/25 is typically packaged in:
25 kg kraft paper bags
50 kg meltable PE bags
180 kg steel drums
Bulk blocks on pallets
Oxidized Bitumen 85/25 is a high-performance, hard-grade bitumen designed for specialized industrial use. Its elevated softening point and rigid structure make it particularly suitable for coatings, chemical containment, waterproofing, and joint sealing.
Whether you’re securing pipeline infrastructure, insulating thermal equipment, or lining containment vessels, Bitumen 85/25 delivers unmatched durability, chemical resistance, and weather resilience. With a proven track record across construction, oil & gas, and industrial sectors, it remains a vital material for demanding technical applications.
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