Solvay BR-127 Corrosion Inhibiting Primer, Industry Standard for High-Performance Corrosion Resistance



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    BR-127 corrosion inhibiting primer is a modified epoxy primer. It is the industry standard for high performance corrosion inhibiting primers and has been used in virtually every commercial aircraft built since its introduction.

    BR-127 primer can be used with essentially all 250°F (121°C) film adhesives and has been designed to provide optimal structural performance at temperatures ranging from -67°F to 300°F (-55°C to

    149°C). BR-127 primer is formulated to provide maximum environmental resistance and durability within the bond line, as well as prevent corrosive undercutting. It can also be used effectively as a protective coating outside bonded areas.

    BR-127 corrosion inhibiting primer can be cured prior to bonding.

    Recommended cure cycles range:  from 4 hours at 180°F (82°C) to 30 minutes at 250°F (121°C).

    Primered parts should be wrapped in Kraft paper (as protection from dust and dirt) and stored prior to adhesive bonding. Maintaining controlled conditions of 90°F (32°C) maximum temperature and 70% maximum humidity is recommended for extended storage life.

    Cure cycles for adhesive films primed with BR-127 primer may vary from 200°F to 350°F (93°C to 177°C) with minimum pressures to assure proper mating of bonded details.


    Key Features

    1. Industry-wide standard for corrosion resistant primers
    2. Prevents hydrolysis of oxide layers
    3. Structural performance from -67°F to 300°F (-55°C to 149°C)
    4. Compatible with a wide variety of adhesive systems
    5. Improves hydrolytic stability at the adhesive-to-metal interface
    6. Protects prepared surfaces from further oxidation
    7. Recommended use with FM® 73, FM® 87, FM® 94, BR® 95, FM® 123-2, FM® 123-5, FM® 300, FM® 300-1,or FM® 300-2




    Allow the container to warm to room temperature, 75⁰F (24⁰C), before opening. thoroughly mix BR-127 upon opening, primer should be agitated lightly during application.

    Surface Preparation

    A clean, dry, grease-free surface is required for bonding. BR-127 is used with Standard cleaning techniques involving a four step procedure of solvent degreasing, alkaline cleaning, chemical deoxidizing (etching) and phosphoric acid anodizing*.

    General guidance for etching and phosphoric acid anodizing can be found in ASTM D 2651 and ASTM D 3933, respectively.  Best results for aluminum feature priming after appropriate surface preparation.  *Boeing patent 4,085,012 April 1978. Phosphoric acid anodizing is now being used by a large number of aircraft manufacturers due to the improved surface bond durability it provides.


    BR-127 may be sprayed using a variety of equipment including hand-held, automated, or conventional air-atomizing HVLP spray equipment. Parts may be racked for spray and cured in any position convenient for the process. Refer to Tables 6 and 7 for specific equipment set-up recommendations.

    Primer Thickness

    Spray a dry primer thickness of 0.0001 in to 0.0003 in (0.0025 mm to 0.0076 mm) for optimum mechanical properties. Spray technique consists of applying smooth and even coats. The primer should be applied using two to three thin box coats (4 – 6 cross coats) to obtain the final film thickness. Additional coats of primer may be sprayed and cured onto previously cured areas without loss of properties.


    For uniform coating, apply one thin coat of primer to cover the entire part and allow to dry completely (primed portion color will change to lighter yellow when dry). Then spray additional box coats on top to achieve the desired primer thickness. Allow 30 to 60 seconds drying between each box coat.

    Spray dispenser Cleaning

    If using a dispenser in which a water-based material has been used, the spray dispenser must be rinsed and sprayed for at least 1 minute with a suitable solvent (Acetone or MEK) prior to loading the dispenser with BR-127 primer. Clean the dispenser immediately after use by rinsing and spraying with a suitable solvent (Acetone or MEK).

    Dry Time

    15 to 60 minutes at 75⁰F (24⁰C) and less than 55% relative humidity is recommended.

    Primer Cure Cycle

    Dry primer coatings are to be cured at 250°F ± 10°F (121°C ± 6°C) for 30 minutes to obtain a surface which is scratch and MEK resistant. Assemblies primed with BR-127 and then cured may be stored for six months or longer without degradation of the final bond strength. Assemblies that have been primed and cured should be protected from dust and oil by wrapping in protective sheeting such as Kraft paper. Stored assemblies should be wiped with a suitable solvent prior to bonding.

    Bonding cycles

    Primed details may be exposed to up to three 60 minute 250⁰F (121⁰C) cure cycles with no significant loss of primer properties.

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