I. Definition and Classification

Medium-temperature asphalt refers to asphalt materials with a softening point between 70℃-90℃, lying between low-temperature asphalt (softening point <70℃) and high-temperature asphalt (softening point >90℃). Depending on origin and processing technology, it can be categorized into:

• Coal Tar Intermediate Bitumen: Processed from coal tar, it contains a high proportion of resin and asphaltene.
• Petroleum Intermediate Asphalt: Derived from petroleum distillation residues, it offers excellent stability and weather resistance.

II. Production Process

The production process for medium-temperature asphalt primarily includes the following steps:

1. Raw Material Selection: Coal tar or petroleum distillate residue is used as the raw material.
2. Heating Treatment: The raw material is heated to a certain temperature to melt it and remove moisture and light components.
3. Distilled Cutting: Separates various fractions through a distillation tower to obtain intermediate-temperature asphalt.
4. Blended Modified: Add modifiers such as polymers, rubber powder, etc., as needed to enhance performance.
5. Filter Packaging: After filtering impurities, the product is filled into drums or stored in tanks.

III. Performance Features

Medium-temperature asphalt has the following performance characteristics:

1. Moderate viscosity: Good fluidity, easy to apply, suitable for various application methods.
2. Excellent adhesion: Strong bonding with aggregates, fibers, and other materials, enhancing the overall performance of the material.
3. Medium softening point: Maintains stability at room temperature, flows minimally at high temperatures, and is not brittle at low temperatures.
4. Excellent weather resistance: Good tolerance to environmental factors such as ultraviolet rays and oxidation.

Four, Application Fields

Medium-temperature asphalt is widely used in various fields:

1. Road Engineering:

• Bituminous Mixture: Serving as the base asphalt for road asphalt mixtures, enhancing the pavement's resistance to rutting and durability.
• Emulsified Asphalt: Produced through emulsification process, used for slurry seals, priming oils, and more.

1. Waterproof materials:

• Waterproof Membrane: As a base material or additive for waterproof membranes, enhances waterproofing performance.
• Waterproof Coating: Used for producing waterproof coatings, enhancing the bonding and water resistance of the coating.

1. Construction Adhesive:

• Tile Adhesive Additive: Enhances bonding strength as an additive for tile adhesives.
• Sealant Materials: Used for sealing building gaps to prevent leakage.

1. Other Fields:

• Corrosion-resistant materials: Used for anti-corrosion treatment of pipes and equipment.
• Carbon materials: Serve as a binder for carbon products, enhancing their mechanical strength.

V. Technical Specifications Reference

Typical technical specifications of medium-temperature asphalt are as follows:

Softening Point (°C) 70-90 indicates the high-temperature stability of asphalt; Penetration (0.1mm) 60-120 reflects the hardness of asphalt; Extensibility (5cm/min) ≥30 indicates the plasticity of asphalt; Flash Point (°C) ≥230 reflects the combustion safety of asphalt.