Request Information
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 250ºF (121ºC) film adhesives and has been designed to provide optimal structural performance at temperatures ranging from -67ºF to 300ºF (-55ºC to 149ºC). 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 180ºF (82ºC) to 30 minutes at 250ºF (121ºC).
Unit of Measure

Specifications

Structural Performance

 N/A -67 to 300 ºF-55 to 149 ºC

Color

 N/A Yellow

Characteristics for Physical Properties (Liquid Primer)

Shelf Life

 N/A 12 months at or below 0ºF (-18ºC) from date of shipment

Shop Life at 75 Degree Fahrenheit (ºF) (24 Degree Celsius (ºC))

 N/A 10 days

Shop Life at 90 Degree Fahrenheit (ºF) (32 Degree Celsius (ºC))

 N/A 5 days

Density

 N/A 7.3 lb/gal875 g/L

Volatile Organic Content (VOC)

 N/A 6.6 lb/gal792 g/L

Test Method for Volatile Organic Content (VOC)

 N/A American Society for Testing and Materials (ASTM D 3960)

Out-Gassing (Total Mass Loss (TML))

 N/A 0.48 %

Out-Gassing (Collected Volatile Condensable Materials (CVCM))

 N/A 0.03 %

Out-Gassing (Water Vapor Regained (WVR))

 N/A 0.19 %

Test Method for Out-Gassing

 N/A American Society for Testing and Materials (ASTM E 595)

Characteristics for Product Availability

Solids Content

 N/A 10 %

Tolerance for Solids Content (±)

 N/A 1.0 %

Test Method for Solids Content

 N/A American Society for Testing and Materials (ASTM D 2369)

Size

 N/A 0.25 gal1.00 gal5.00 gal0.95 L3.79 L18.9 L

Processing

Mixing

 N/A Allow the container to warm to room temperature, 75ºF (24ºC), before opening. Thoroughly mix BR® 127 upon opening, primer should be agitated lightly during application.

Surface Preparation

 N/A 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 (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.). 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.

Equipment

 N/A 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.

Primer Thickness

 N/A 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.

Spraying

 N/A 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 Gun Cleaning

 N/A If using a gun in which a water-based material has been used, the spray gun must be rinsed and sprayed for at least 1 minute with a suitable solvent (Acetone or MEK) prior to loading the gun with BR® 127 primer.

Clean the gun immediately after use by rinsing and spraying with a suitable solvent (Acetone or MEK).

Dry Time

 N/A 15 to 60 minutes at 75ºF (24ºC) and less than 55% relative humidity is recommended.

Primer Cure Cycle

 N/A Dry primer coatings are to be cured at 250ºF ± 10ºF (121ºC ± 6ºC) 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

 N/A Primed details may be exposed to up to three 60 minute 250ºF (121ºC) cure cycles with no significant loss of primer properties.

Spray Gun Settings for Binks 95 Model

Fan Adjustment (Binks 95 Model)

 N/A 0.5 to 1 Counter-Clockwise Turn

Fluid Control (Needle Adjustment Screw) (Binks 95 Model)

 N/A 2 to 2.5 Counter-Clockwise Turns

Needle (Binks 95 Model)

 N/A Part #665

Air Cap Model (Binks 95 Model)

 N/A 66SD

Cup Pressure (Binks 95 Model)

 N/A 8 to 12 psi0.056 to 0.082 MPa

Fluid Tip (Binks 95 Model)

 N/A Model 66SS

Spraying Distance (Nozzle to Panel) (Binks 95 Model)

 N/A 14 to 16 in36 to 41 cm

Room Temperature (Binks 95 Model)

 N/A 70 to 90 ºF21 to 32 ºC

Humidity (Binks 95 Model)

 N/A < 65 %

Air Supply Pressure (Binks 95 Model)

 N/A 35 to 50 psi0.24 to 0.34 MPa

Spray Gun Settings for Devilbiss Spray Gun (HVLP) Model GTi H05

Fan Adjustment (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 1 to 1.25 Counter-Clockwise Turns

Fluid Control (Needle Adjustment Screw) (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 1 to 1.5 Counter-Clockwise Turns

Needle (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A Part # GTI-413

Air Cap Model (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 2000

Cup Pressure (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 7 psi0.05 MPa

Fluid Tip (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 2.0

Spraying Distance (Nozzle to Panel) (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 14 to 16 in36 to 41 cm

Room Temperature (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 70 to 90 ºF21 to 32 ºC

Humidity (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A < 65 %

Air Supply Pressure (Devilbiss Spray Gun (High Volume Low Pressure (HVLP)) Model GTi H05)

 N/A 35 to 50 psi0.24 to 0.34 MPa

Spray Gun Settings for SATA Jet 4000 B RP

Fan Adjustment (SATA Jet 4000 B RP) (±)

 N/A 45 º

Fluid Control (Needle Adjustment Screw) (SATA Jet 4000 B RP)

 N/A 2 to 2.5 Counter-Clockwise Turns

Needle (SATA Jet 4000 B RP)

 N/A Jet 4000 B RP 1.0

Air Cap Model (SATA Jet 4000 B RP)

 N/A Jet 4000 B RP 1.0

Cup Pressure (SATA Jet 4000 B RP)

 N/A 5 to 10 psi0.034 to 0.069 MPa

Fluid Tip (SATA Jet 4000 B RP)

 N/A Jet 4000 B RP 1.0

Spraying Distance (Nozzle to Panel) (SATA Jet 4000 B RP)

 N/A 8 to 14 in20 to 36 cm

Room Temperature (SATA Jet 4000 B RP)

 N/A 70 to 90 ºF21 to 32 ºC

Humidity (SATA Jet 4000 B RP)

 N/A < 65 %

Air Supply Pressure (SATA Jet 4000 B RP)

 N/A 25 to 35 psi0.172 to 0.241 MPa

Features and Benefits

Features and Benefits

 N/A
  • Industry-wide standard for corrosion resistant primers
  • Prevents hydrolysis of oxide layers
  • Compatible with a wide variety of adhesive systems
  • Improves hydrolytic stability at the adhesive-to-metal interface
  • Protects prepared surfaces from further oxidation
  • 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

Additional Information

Additional Information

 N/A Primed details should be wrapped in Kraft paper (as protection from dust and dirt) and stored prior to adhesive bonding. Maintaining controlled conditions of 90ºF (32ºC) 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 200ºF to 350ºF (93ºC to 177ºC) with minimum pressures to assure proper mating of bonded details.