
Bitumen primer D41 Description
Bitumen Primer D41 is a specific type of primer designed to prepare surfaces for the application of bitumen-based waterproofing membranes and coatings. This primer enhances the adhesion of bitumen materials to various substrates, ensuring a strong and durable bond. Below is a detailed description of Bitumen Primer D41:
Description
– Composition: Bitumen Primer D41 is typically composed of high-quality bitumen dissolved in a solvent. This combination allows the primer to penetrate porous surfaces effectively, creating a strong base for subsequent bituminous layers.
– Appearance: It generally appears as a black or dark brown liquid with a relatively low viscosity, making it easy to apply.
Properties
– Adhesion: Enhances the adhesion of bitumen membranes and coatings to substrates such as concrete, metal, wood, and masonry.
– Penetration: The solvent allows the primer to penetrate deeply into the substrate, sealing pores and creating a solid surface for better bonding.
– Drying Time: Fast drying, which reduces the waiting time before the application of the main bitumen layer.
– Waterproofing: Provides an initial layer of waterproofing, contributing to the overall effectiveness of the bitumen-based waterproofing system.
– Flexibility: Remains flexible after drying, which helps accommodate slight movements in the substrate.
Applications
– Surface Preparation: Used as a preparatory coating on surfaces before the application of bitumen-based waterproofing membranes or coatings.
– Roofing: Priming roofs before the installation of bitumen roll sheets or liquid-applied bitumen coatings.
– Foundation Waterproofing: Applied on foundation walls and other below-grade structures to ensure proper adhesion of bitumen membranes.
– Concrete Structures: Priming concrete surfaces such as bridges, tunnels, and culverts before applying bitumen coatings.
– Metal Surfaces: Preparing metal substrates to enhance the bond of bitumen protective coatings.
Application Method
1. Surface Preparation: Ensure the substrate is clean, dry, and free of dust, dirt, oil, and other contaminants. Repair any significant cracks or defects.
2. Application: Apply the primer using a brush, roller, or spray equipment. Ensure an even coat over the entire surface.
3. Drying Time: Allow the primer to dry completely, which typically takes a few hours depending on ambient conditions such as temperature and humidity.
4. Subsequent Layers: Once dry, proceed with the application of bitumen membranes or coatings.
Safety and Handling
– Ventilation: Use in well-ventilated areas to avoid inhalation of solvent fumes.
– Protective Gear: Wear appropriate personal protective equipment (PPE) such as gloves, goggles, and masks.
– Flammability: Since the primer contains solvents, it is flammable. Keep away from open flames and heat sources.
– Storage: Store in a cool, dry place away from direct sunlight and sources of ignition.
By using Bitumen Primer D41, construction professionals can significantly improve the performance and longevity of bitumen-based waterproofing systems, ensuring a more reliable and effective barrier against water ingress.
Bitumen Primer D41 Applications
Bitumen Primer D41 is a versatile product used in various applications across the construction industry. Its primary purpose is to prepare surfaces for the application of bituminous waterproofing materials, ensuring strong adhesion and long-lasting protection. Here are some common applications of Bitumen Primer D41:
- Roofing:
– Priming roof surfaces before the installation of bitumen membranes or coatings to enhance adhesion and waterproofing performance.
– Sealing seams, joints, and edges of roofing materials to prevent water infiltration and ensure a watertight seal. - Foundation Waterproofing:
– Preparing foundation walls and concrete surfaces for the application of waterproofing membranes to prevent moisture penetration and dampness in basements and below-grade structures. - Concrete Structures:
– Priming concrete surfaces on bridges, tunnels, parking decks, and other structures to improve the bond with bitumen coatings and membranes, enhancing durability and waterproofing. - Metal Surfaces:
– Priming metal roofs, tanks, pipelines, and other metal structures to protect against corrosion and prepare them for the application of protective bituminous coatings. - Masonry and Wood:
– Preparing masonry walls, wooden structures, and other substrates for waterproofing to ensure proper adhesion of bitumen-based materials and prevent water damage. - Road and Pavement Maintenance:
– Priming cracks, joints, and damaged areas in asphalt pavements and concrete roads before applying bituminous sealants or repair materials to prevent water intrusion and deterioration. - Water Retaining Structures:
– Priming surfaces of reservoirs, tanks, swimming pools, and other water-retaining structures to ensure effective waterproofing with bitumen membranes or coatings. - General Waterproofing:
– Priming various substrates such as metal, concrete, masonry, and wood in construction projects requiring waterproofing, such as tunnels, culverts, and building facades.
Application Method:
- Surface Preparation:
– Clean the surface thoroughly to remove dirt, dust, grease, and loose particles.
– Repair any cracks, holes, or damaged areas before applying the primer. - Primer Application:
– Apply Bitumen Primer D41 evenly using a brush, roller, or spray equipment.
– Ensure complete coverage of the surface with a uniform layer of primer. - Drying Time:
– Allow the primer to dry completely according to the manufacturer’s instructions before proceeding with the application of bitumen membranes or coatings. - Follow-Up:
– Once the primer is dry, apply the desired bitumen waterproofing material following proper installation procedures.
Safety Precautions:
– Wear appropriate personal protective equipment (PPE) such as gloves, goggles, and masks when handling Bitumen Primer D41.
– Use in a well-ventilated area to avoid inhalation of fumes.
– Keep the product away from open flames and heat sources due to its flammability.
– Store Bitumen Primer D41 in a cool, dry place away from direct sunlight and sources of ignition.
By using Bitumen Primer D41 in these applications, construction professionals can ensure effective waterproofing and protection of various structures and surfaces against moisture and water damage.

Bitumen primer adhesive
Bitumen primer adhesive refers to a type of primer specifically formulated to enhance the adhesion of bituminous materials to various substrates. It serves as both a primer and an adhesive, promoting a strong bond between the surface and the subsequent bitumen layers, such as membranes, coatings, or sealants.
Here are some key points about bitumen primer adhesive:
- Adhesion Enhancement : Bitumen primer adhesives are designed to improve the bonding strength between the substrate and the bituminous materials applied over it. This helps to create a more durable and long-lasting waterproofing or sealing system.
- Surface Preparation : Before applying bitumen primer adhesive, the surface must be cleaned thoroughly to remove any dirt, dust, grease, or other contaminants. Proper surface preparation is essential for achieving optimal adhesion.
- Versatility : Bitumen primer adhesives can be used on a variety of substrates, including concrete, masonry, metal, wood, and asphalt. They provide excellent adhesion to both porous and non-porous surfaces.
- Application Method : Bitumen primer adhesive is typically applied using a brush, roller, or spray equipment. It should be spread evenly over the surface to ensure uniform coverage and adhesion.
- Drying Time : After application, bitumen primer adhesive needs sufficient time to dry before the application of the bituminous material. Drying time can vary depending on factors such as temperature, humidity, and the porosity of the substrate.
- Compatibility : It’s important to ensure that the bitumen primer adhesive is compatible with the specific bituminous materials being used. Compatibility testing should be conducted if different brands or types of products are being used together.
- Safety Precautions : When handling bitumen primer adhesive, appropriate safety precautions should be followed, including wearing gloves, goggles, and protective clothing. Adequate ventilation should also be maintained to minimize exposure to fumes.
Modified bitumen primer
Modified bitumen primer is a specialized type of bitumen primer that has been enhanced with additives such as polymers to improve its performance characteristics. These modifications typically result in better adhesion, flexibility, and durability compared to standard bitumen primers. Modified bitumen primers are commonly used in conjunction with modified bitumen membranes and other bituminous products in waterproofing and roofing applications.
Key Properties of Modified Bitumen Primer
- Enhanced Adhesion: The polymer modifications significantly improve the primer’s ability to bond with a variety of substrates, including concrete, metal, wood, and masonry.
- Flexibility: Increased flexibility allows the primer to accommodate movements and thermal expansion/contraction of the substrate, reducing the risk of cracking or delamination.
- Durability: Improved resistance to environmental factors such as UV radiation, weathering, and chemical exposure, leading to a longer-lasting bond.
- Quick Drying: Faster drying times enable quicker application of subsequent waterproofing or roofing layers, speeding up the construction process.
- Improved Penetration: Enhanced penetration into porous surfaces, ensuring a strong and uniform bond.
Applications of Modified Bitumen Primer
1. Roofing:
– Priming roof surfaces before the application of modified bitumen membranes.
– Enhancing the adhesion of waterproofing materials on various roofing substrates.
2. Foundation Waterproofing :
– Preparing foundation walls and footings for the application of modified bitumen membranes.
– Providing a strong, moisture-resistant base layer.
3. Concrete Structures:
– Priming concrete surfaces on bridges, tunnels, and parking decks to improve the bond with modified bitumen coatings and membranes.
4. Metal Surfaces:
– Priming metal roofs, tanks, pipelines, and other structures to enhance corrosion protection and adhesion of bituminous materials.
5. Masonry and Wood:
– Preparing masonry and wooden surfaces for waterproofing applications.
6. Road and Pavement Maintenance:
– Priming cracks, joints, and damaged areas in asphalt pavements and concrete roads before applying bituminous repair materials.
Application Method
1. Surface Preparation:
– Clean the surface thoroughly, removing all dirt, dust, grease, and loose particles.
– Repair any cracks or defects.
2. Application:
– Stir the primer well before use.
– Apply the primer evenly using a brush, roller, or spray equipment.
– Ensure complete and uniform coverage of the surface.
3. Drying Time:
– Allow the primer to dry completely before applying the bitumen membrane or coating. Drying times can vary based on ambient conditions.
4. Follow-Up:
– Proceed with the application of the bituminous material once the primer has dried.
Safety and Handling
– Ventilation: Use in well-ventilated areas to avoid inhalation of fumes.
– Protective Gear: Wear appropriate personal protective equipment (PPE) such as gloves, goggles, and masks.
– Flammability: Keep away from open flames and heat sources, as the primer contains solvents that can be flammable.
– Storage: Store in a cool, dry place away from direct sunlight and sources of ignition.
By using modified bitumen primer, construction professionals can ensure enhanced performance, durability, and longevity of bitumen-based waterproofing and roofing systems, providing reliable protection against water ingress and environmental damage.
Features of Bitumen Primer D 41
Bitumen Primer D 41 is a specialized product used in construction for surface preparation before the application of bituminous materials. Here are the key features of Bitumen Primer D 41:
- Adhesion: Bitumen Primer D 41 significantly enhances the adhesion of bituminous membranes and coatings to various substrates, including concrete, masonry, and metal.
- Penetration: The primer penetrates porous surfaces, sealing them and providing a uniform base for subsequent bituminous applications. This helps in reducing the risk of blistering and ensures a better bond.
- Quick Drying: It has a relatively fast drying time, which allows for quicker progression to the next stage of construction without prolonged waiting periods.
- Waterproofing: The primer helps in improving the waterproofing characteristics of the substrate by sealing minor pores and cracks, thus preventing water infiltration.
- Versatility: Bitumen Primer D 41 can be used on a variety of surfaces including concrete, metal, wood, and old bituminous surfaces, making it a versatile choice for many construction and maintenance projects.
- Ease of Application: It can be applied using a brush, roller, or spray, providing flexibility in application methods depending on the project requirements.
- Improved Durability: By ensuring a strong bond between the substrate and the bituminous layer, the primer contributes to the overall durability and longevity of the waterproofing or paving system.
Cover Rate
Coverage rate varies from 0.3 ‐ 0.5 kg/sq.mt depending on application method, surface properties and condition of substrates.
Dry Time
Less than 4 hours, to touch depends on local weather conditions.
Preparatory Works
– The surface must be thoroughly cleaned and free from dust, dirt, oil, and grease.
– Bitumen primer D‐41 should be well stirred prior to use and applied to the substrate by means of brush, roller or spray.
– After application don’t leave the primer exposed for more than 12‐ hrs, if this should be the case, apply a further coat and allow curing.
– Tools must be cleaned with any suitable solvents such as gasoline or kerosene.
Specification of Bitumen Primer D41
| Specification | RESULT | TEST METHOD |
| Color | Black | — |
| Viscosity Saybolt @ 25 °C | 25 – 125 sec | ASTM D 88 |
| Specific gravity @ 25 °C | 0.958 | ASTM D 1475 |
| Solubility in trichloro ethylene | 99.7% | ASTM D 2042 |
| Density | 0.85 ‐ 0.89 | ASTD D 70 |
| Distillation volume @ 225 °C | 37% | ASTM D ‐ 402/D422 |
| Distillation volume @ 260 °C | 39.5% | ASTM D ‐ 402/D422 |
| Distillation volume @ 360 °C | 42.5% | ASTM D ‐ 402/D422 |
| Asphalt residue @225 °C | 63% | ASTM D ‐402 |
| Asphalt residue @260 °C | 60.5% | ASTM D ‐402 |
| Asphalt residue @360 °C | 57.5% | ASTM D ‐402 |
| Water Content % | <0.3 Max | ASTM D6511/D95 |
| Flash Point | 45 OC | ASTM D 94 |
| Drying time | 8 ‐ 12‐Hours | In house |
| Coverage rate | 0.3 ‐ 0.5 Kg/mt2 | In house |
| Shelf life | 2‐years | In house |
Health, Safety and Environment
- use only with proper ventilation.
- Avoid contact skin and eyes by careful working.
- Do not use near open flame.
- It is advisable to use goggles and gloves.
- In case of eye contact immediately wash
- with cold water or consult the physician
All safety measures should be observed during application. Fire extinguishers should be available at site. Care should be taken with gas,
and torch should not be rested on finished surface or on any materials that can be scratched by flame or hot torch. Gloves and goggles should be worn by all workers during application.
Read, understand and follow all Material Safety
Data Sheets and product label information for this
product prior to use.



