What is Bitumen Primer?

Bitumen Primer for priming surfaces prior to the application of bituminous materials.

Application of bitumen primer

Bitumen primer is a bitumen based primer for the surface conditioning of concrete and timber substrates prior to the application of heat fused APP and SBS modified bitumen membranes such as UniTorch.

Versatile bituminous primer for porous and non-porous surfaces

  • Used on concrete, metal and timber surfaces
  • Economical & easy to apply

Bitumen Primer Application

Bitumen Primer may be applied by brush or roller. The applied film must be allowed to dry before being overlayed with any waterproofing treatment so as to avoid solvent entrapment.

Surface Preparation as with all surface coatings, good preparation is of paramount Important to the success and long-life of the system.

Ensure that the surface to be treated is dry and sound, free of Loose, dusting or flaking particles and free from contaminants Such as grease and fungus. Defects such as cracks, broken mortar joints, etc. are to be Repaired prior to primer application.

Usage of Bitumen Primer

Iran bitumen primers usage in the adhesion of the coating by providing a bond between the surfaces. Bitumen Primers come in many different types of primer be based on the substrate, weather conditions, and the type of coating being applied.

Dust, chalking film, bitumen exudate and greases or oils should be cleaned off of the roof prior to the application of coatings. For more on preparing a modified bitumen roof surface prior to coating application, consult the Roof Coating Manufacturers Association/Asphalt Roofing Manufacturers Association document entitled Evaluation and Preparation of Modified Bitumen Roofing Systems for the Application of Surface Coatings.

Bitumen primer using in surface coating

A decision to employ a primer should not be made without consulting the manufacturer’s requirements for the specific coating and substrate. A primer has been never a substitute for proper roof membrane preparation. The substrate should be clean and dry prior to roof coating application.

Primers are compatible with modified bitumen products, but the manufacturer recommendations should be checked before using a primer. Primers are generally applied to clean, dry surfaces, however, asphalt emulsions primers can be applied to damp (not wet) surfaces. Primer and surface coating application should occur in short order. Following are some general guidelines regarding the application of primer which is useful to consider.

Surfaces which generally require primer include: metal flashings, gravel stops, and other metal edging; concrete and masonry roof decks, masonry walls and floors and gypsum and other porous surfaces. Asphalt primers should be used with asphalt materials only.

Specification of Bitumen Primer

  • V:3.5 - 5m2 per liter
  • Viscosity:   @ 20°C 50-100cps (Brookfield RVT Spindle 2 Speed 50rpm)  
  • Specific Gravity: 0.89 +/- 0.02  
  • Solids Content: 40% by weight minimum  
  • Flash Point:  38°C  
  • Drying Time: Normally touch dry after 30 minutes.  
  • Completely dry after 11/2 hours.  
  • Method of use:  Apply by brush or spray.  
  • Surfaces should be clean, IE. Free from all oil, grease, dirt, dust and loose debris.