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Interplate 937

A two pack, heat resistant, zinc silicate shop (pre-construction) primer providing good corrosion protection (even after heating up to 800°C), with minimum production of zinc salts. Excellent welding and cutting properties and resistance to damage caused by welding, gas cutting and fairing thereby reducing secondary surface preparation requirements in comparison to typical zinc silicate products.

Intended uses

As a shop (pre-construction) primer for the protection of steel during fabrication and assembly. Suitable for use with controlled cathodic protection. For use at Newbuilding.

color NQA933-Grey, NQA934-Brown (available in USA and Europe only)
Finish/Sheen Matt
Part B (Curing Agent) NQA936
Volume Solids 23% ±2% (ISO 3233:1998)
Mix Ratio 0.60 volume(s) Part A to 1 volume(s) Part B
Typical Film Thickness 13 microns dry (57 microns wet)
Theoretical Coverage 17.69 m2/litre at 13 microns dft, allow appropriate loss factors
Method of Application Airless Spray, Brush, Conventional Spray, Roller
Flash Point Part A 10°C; Part B 14°C; Mixed 13°C (Product produced and supplied in North America has flash points of Part A 14°C, Part B 15°C and Mixed 14°C respectively due to locally sourced solvents. There is no detrimental effect on product performance.)
Induction Period Not required

Drying Information

  Substrate Temperature
  5°C 10°C 25°C 35°C
Hard Dry [ISO 9117:90]     5 mins 4 mins
Pot Life

24 hrs

24 hrs 24 hrs 8 hrs

Overcoating Data


Consult International Paint, minimum of 7 days for appropriate primers.

Regulatory data


649 g/lt as supplied (EPA Method 24) 519 g/kg of liquid paint as supplied. EU Solvent Emissions Directive (Council Directive 1999/13/EC)


VOC values are typical and are provided for guidance purposes only. These may be subject to variation depending on factors such as differences in colour and normal manufacturing tolerances.


MIL-PRF-23236B, Type I & IV, CL1&2, GR B


When used as part of an approved scheme, this material has the following certification:

  • Weld Fumes - Thermal Degradation on Welding (NOHA)
  • Weld Fumes - Trace Gas Measurement during Welding (SLV)
  • Weld Quality - Approved for Overweldable Shop Primers (GL)
  • Weld Quality - Approval of Prefabrication Primers (LR)
  • Weld Quality - Shop Primers for Welded Steel Structures (BV)
  • Weld Quality - Shop Primers for Corrosion Protection of Steel Plates and Structures (DNV)
  • Weld Quality - Russian Maritime Register of Shipping
  • Weld Quality - Registro Italiano Navale
  • Fire Resistance - Marine Equipment Directive compliant

Consult your International Paint representative for details.

System and compatibility

Consult your International Paint representative for the system best suited for the surfaces to be protected.

Surface preparations

Use in accordance with the standard Worldwide Marine Specifications. All surfaces to be coated should be clean, dry and free from contamination.


Shop primers should be applied using automatic blasting/spraying equipment. Blast to a minimum of Sa21⁄2 (ISO 8501-1:2007). Steel grit or a mixture of steel grit of particle size 0.6-1.0mm and steel shot of particles size 0.6-1.4mm are normally used to give a predominantly angular profile. Apply Interplate 937 before oxidation occurs. If oxidation does occur the entire oxidised area should be reblasted to the standard specified above. Ensure that the area is clean and dry prior to application of Interplate 937. Consult your International Paint representative for specific recommendations.



Material is supplied in 2 containers as a unit. Always mix a complete unit in the proportions supplied. Agitate Paste (Part A) with a power agitator, slowly add binder (Part B) while agitating. Allow to mix for at least 5 minutes, sieve through a 30-60 mesh screen before use. Continue stirring during use.


GTA820 (Winter Grade), GTA840 (Summer Grade) (USA) Not recommended. Use International GTA820, GTA840 only in exceptional circumstances (max 15% by volume). DO NOT thin more than allowed by local environmental legislation.

Airless Spray

Recommended Tip Range 0.38-0.58 mm (15-23 thou) Total output fluid pressure at spray tip not less than 60 - 100 kg/cm2 (850 - 1420 p.s.i.)

Conventional Spray

Use suitable proprietary equipment. Thinning may be required.


Application by brush is recommended for small areas only. Multiple coats may be required to achieve specified film thickness.


Application by roller is recommended for small areas only. Multiple coats may be required to achieve specified film thickness.


International GTA820/GTA840

Work Stoppages and Cleanup

Do not allow material to remain in hoses, gun or spray equipment. Thoroughly flush all equipment with International GTA820 or GTA840 (USA). Once units of paint have been mixed they should not be resealed and it is advised that after prolonged stoppages, work recommences with freshly mixed units. Clean all equipment immediately after use with International GTA820 or GTA840 (USA). It is good working practice to periodically flush all spray equipment during the course of the working day. Frequency should depend upon amount sprayed, temperature and elapsed time, including any delays. Do not exceed pot life limitations. All surplus material and empty containers should be disposed of in accordance with appropriate regional regulations/legislation.


Hot Work In the event welding or flame cutting or fairing is performed on metal coated with this product, dust and fumes will be emitted which will require the use of appropriate personal protective equipment and adequate local exhaust ventilation. In North America do so in accordance with instruction in ANSI/ASC Z49.1 "Safety in Welding and Cutting."


All work involving the application and use of this product should be performed in compliance with all relevant national Health, Safety & Environmental standards and regulations. Prior to use, obtain, consult and follow the Material Safety Data Sheet for this product concerning health and safety information. Read and follow all precautionary notices on the Material Safety Data Sheet and container labels. If you do not fully understand these warnings and instructions or if you can not strictly comply with them, do not use this product. Proper ventilation and protective measures must be provided during application and drying to keep solvent vapour concentrations within safe limits and to protect against toxic or oxygen deficient hazards. Take precautions to avoid skin and eye contact (ie. gloves, goggles, face masks, barrier creams etc.) Actual safety measures are dependant on application methods and work environment.


Drying times will depend on the substrate temperature and ventilation conditions. If the relative humidity is below 50%, cure will be retarded. Interplate 937 is not recommended for manual spray application. At higher dry film thickness, fabrication properties (welding and cutting) may be affected. Shop primers are not recommended for use as touch-up primers after fabrication.

Overcoating information is given for guidance only and is subject to regional variation depending upon local climate and environmental conditions. Consult your local International Paint representative for specific recommendations. The temperature of the surface to be coated must be at least 3°C above the dew point. For optimum application properties bring the material to 21-27°C , unless specifically instructed otherwise, prior to mixing and application. Unmixed material (in closed containers) should be maintained in protected storage in accordance with the information given in the STORAGE section of this data sheet.

Unit size

Unit size Part A Part B
  Vol Pack Vol Pack
20 lt 7.5 lt 20 lt 12.5 lt 15 lt
5 US gal 1.88 US gal 5 US gal 3.13 US gal 3.5 US gal

Unit shipping weight

Unit size Unit Weight
20 lt 27.88 Kg
5 US gal 58 lb


Shelf Life Low flash storage required. Part A - 12 months minimum from date of manufacture at temperatures up to 25°C. Part B - 6 months minimum from date of manufacture at temperatures up to 25°C. Subject to reinspection thereafter. Store in dry, shaded conditions away from sources of heat and ignition.