Oxidized Bitumen 75/35 Technical Specifications & Industrial Uses

Learn about Oxidized Bitumen 75/35, its full specifications, technical performance, and uses in construction, adhesives, roofing, and more.

🛢️ Oxidized Bitumen 75/35 Specification and Performance Guide

Oxidized Bitumen 75/35 is a highly refined, semi-solid bituminous material known for its medium softening point and low penetration value. It delivers superior waterproofing, adhesion, and thermal stability, making it an essential material in several industrial and construction applications. This post provides complete technical data, performance insights, and real-world applications for Oxidized Bitumen 75/35.

🔍 What is Oxidized Bitumen 75/35?

Oxidized Bitumen 75/35—also referred to as Blown Asphalt 75/35 or Bitumen 75/35—is manufactured by passing air through hot bitumen under controlled temperature. This process increases the bitumen’s softening point and decreases its penetration, creating a product that is rigid, weather-resistant, and ideal for industrial sealing and insulation tasks.

The designation 75/35 indicates:

  • Softening Point: 75°C

  • Penetration: 35 dmm at 25°C

Applications of Bitumen 60/70, Blown Asphalt Production Process, Asphalt road surfaces,
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⚙️ Technical Specifications of Oxidized Bitumen 75/35

PropertyTypical ValueTest Method
Softening Point (Ring & Ball)75 ± 5 °CASTM D36
Penetration @ 25°C30–40 dmmASTM D5
Flash Point (COC)> 230 °CASTM D92
Loss on Heating (wt.%)< 0.5%ASTM D6
Solubility in Trichloroethylene≥ 99%ASTM D2042
Specific Gravity @ 25°CApprox. 1.05ASTM D70
Ductility @ 25°C< 1.5 cmASTM D113
Drop PointApprox. 165 °CASTM D3954
AppearanceBlack, solid/semi-solidVisual Inspection

📊 Detailed Explanation of Technical Properties:

  • Softening Point (75°C): Offers balanced heat resistance—enough to prevent flow under summer temperatures but flexible for application at elevated temperatures.

  • Penetration (30–40 dmm): Slightly softer than 75/30, providing better adaptability for waterproofing membranes and adhesives requiring moderate flow.

  • Flash Point (>230°C): Ensures high safety margins during melting and application with minimal risk of ignition.

  • Loss on Heating (<0.5%): Indicates long-term thermal stability under processing or application conditions.

  • Solubility (≥99%): Confirms purity and ease of blending in chemical formulations and emulsions.

  • Specific Gravity (1.05): Suitable for uniform spreading on various substrates without slumping.

  • Ductility (<1.5 cm): Maintains enough rigidity for industrial stability while allowing limited flexibility under minor stress.

  • Drop Point (~165°C): Prevents dripping or deformation under service temperatures, especially in coatings.

  • Appearance: Typically black, smooth, and homogenous, ensuring a professional finish in final applications.

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Applications of Bitumen 60/70, Penetration Asphalt, Blown Asphalt Production Process, How to Produce Oxidized Bitumen? Industrial Bitumen Uses,

🏭 Industrial Applications of Oxidized Bitumen 75/35

Oxidized Bitumen 75/35 is a dependable choice for industries seeking high durability and controlled flexibility. Below are the primary sectors where this grade excels:

🧱 1. Roofing & Membrane Waterproofing

This grade is extensively used in waterproofing membranes, roofing felts, and moisture barriers. Its slightly higher penetration (compared to 75/30) allows better flexibility on roof surfaces, preventing cracks caused by temperature-induced expansion and contraction.

It’s compatible with SBS and APP modified membranes, fiberglass sheets, and aluminum-coated underlays for enhanced water and UV resistance.

🛣️ 2. Bridge Decks and Expansion Joints

Oxidized Bitumen 75/35 is ideal for sealing expansion joints on bridges and highways. It maintains integrity under moderate thermal movement, offering a balance of hardness and flow. This grade is preferred for joint sealant formulations, prefabricated asphalt panels, and precast concrete interfaces.

Its non-brittle nature at low temperatures makes it suitable for temperate and semi-arid regions.

🛢️ 3. Oil & Gas Pipe Coatings

In the oil and gas sector, Oxidized Bitumen 75/35 is used as an external corrosion protection coating on buried pipelines, storage tanks, and manifolds. The bitumen provides a dielectric layer that protects steel from chemical and electrochemical corrosion.

It can also be applied in multi-layer coating systems with coal tar enamel, fiberglass, or wrapping membranes.

🧪 4. Chemical Protective Linings

Chemical facilities use this grade to line reaction vessels, neutralization pits, and storage tanks. Bitumen 75/35 resists non-oxidizing acids, alkalis, and saline environments, making it ideal for lining and sealing effluent treatment infrastructure.

Its low permeability ensures containment integrity even in vapor-prone applications.

🧴 5. Adhesives & Mastics

Oxidized Bitumen 75/35 works as a binder in mastics, industrial adhesives, and sealing tapes. It is compatible with mineral fillers, synthetic polymers, and tackifiers to form high-performance compounds.

This grade allows good spreadability and strong adhesion on concrete, wood, and metal surfaces.

🎨 6. Protective Paints & Primers

Bitumen 75/35 is used in solvent-based protective paints, anti-corrosive primers, and bituminous coatings for marine, infrastructure, and industrial applications. It offers a long service life, UV resistance, and strong adherence to steel and concrete.

It is often the base for bitumen-aluminum paints, blacktop sealers, and protective emulsions.

🧪 Performance Characteristics

  • ✅ Balanced Softening Point (75°C): Thermal resistance without excessive brittleness

  • ✅ Medium Penetration (35 dmm): Good flexibility with strength

  • ✅ Chemical Stability: Withstands alkalis, acids, and salts

  • ✅ Waterproofing Efficiency: Low permeability and strong adhesion

  • ✅ Application Safety: Flash point over 230°C

  • ✅ Thermal Durability: Resistant to heat-aging and oxidation

❓ FAQs about Oxidized Bitumen 75/35

❓ What is the difference between 75/30 and 75/35 Oxidized Bitumen?

Both grades have the same softening point (75°C), but 75/35 has higher penetration (is slightly softer). This provides more flexibility, making it suitable for applications where minor movement or bending occurs.

❓ Is 75/35 suitable for hot-melt adhesives?

Yes, Oxidized Bitumen 75/35 is commonly used in industrial adhesives, mastics, and tile bonding agents due to its balance of flow and hardness when heated.

❓ How should Oxidized Bitumen 75/35 be applied?

It is typically heated to 180–200°C in a bitumen kettle or industrial melter and then applied via brush, roller, or spray, depending on the end use.

❓ Is Bitumen 75/35 compatible with polymers?

Yes. It can be modified with SBS, APP, or ethylene-vinyl acetate (EVA) to improve its elasticity and weather resistance in membrane or coating applications.

❓ Can 75/35 be used in marine or saltwater environments?

Yes. Thanks to its chemical resistance and impermeability, it performs well in coastal applications, dock structures, and subsea installations.

❓ What’s the shelf life of Oxidized Bitumen 75/35?

When stored in dry conditions, away from direct sunlight and moisture, it can retain its properties for up to 10 years.

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🔍 Conclusion

Oxidized Bitumen 75/35 is a versatile material that bridges the gap between flexibility and durability. Whether you’re working on roofing, pipeline insulation, industrial adhesives, or chemical containment, this grade offers consistent performance and ease of use.

📣 Call to PEAK UNIVERSAL BUSINESS LTD: Secure Your Supply of Oxidized Bitumen 75/35 Now

👉 Need a custom supply for roofing, waterproofing, or pipeline insulation?

📦 Bulk packaging available: Kraft bags, drums, or blocks

🌍 Global delivery for industrial buyers and contractors

📞 Get a Technical Datasheet or MSDS Today

✅ Contact our experts today to get the highest-quality Blown Asphalt 75/35—manufactured, tested, and delivered to meet your exact specifications.

✅ We in PEAK UNIVERSAL BUSINESS LTD. provide fast shipping, technical guidance, and full compliance with international standards.

📞 Request a quote now or speak with our team for more information.

📧 Email: [email protected] 

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