International Interplus 256

Part A: UN1263 (Class: 3, Pk Grp: III), Part B: UN3066 (Class 8, Pk Grp: III)
A low VOC epoxy primer for improved corrosion resistance. Highways Approved Item No. 115.
Available in 5 Litres in Aluminium
£122.10 £101.75
In stock
Product Description

International Interplus 256 is a low VOC two component internally flexibilised high build surface tolerant epoxy primer. Pigmented with aluminium and lamellar micaceous iron oxide for improved corrosion resistance.

Best Uses

International Interplus 256 is used as Ia high performance maintenance coating on a wide variety of surfaces including hand or power tool cleaned rusty steel. It is ideal for use in conjunction with wet abrasive blasting or ultra high pressure water blasting, or as a patch primer for rusty surfaces in maintenance situations.

For use on hot surfaces continuously running at up to 150c (302F) and for corrosion protection under thermal insulation of carbon steel and stainless steel.

Interplus 256 will generally be applied to bare steel but is fully compatible for overlap onto most aged coatings, in addition to touch up repair of the following primers:


The performance of this product will depend upon the degree of surface preparation. The surface to be coated must be clean and free from contamination. Prior to paint application all surfaces should be assessed and treated in accordance with ISO 8504:2000. Accumulated dirt and soluble salts must be removed. Dry bristle brushing will normally be adequate for accumulated dirt. Soluble salts should be removed by fresh water washing.

Abrasive Blast Cleaning: Interplus 256 may be applied to a surface abrasive blast cleaned to a minimum Sa1 (ISO 8501-1:2007) C or D grade rusting, or SSPC SP7.

Hand or Power Tool Preparation: Hand or power tool clean to a minimum of St2 (ISO 8501-1:2007) or SSPC-SP2. Note, all scale must be removed and areas which cannot be prepared adequately by chipping or needle gun should be spot blasted to a minimum standard of Sa2 (ISO 8501-1:2007) or SSPC-SP6. Typically this would
apply to C or D grade rusting in this standard. On hot steel surfaces, cleaning to a minimum St3 (ISO 8501-1:2007) or SSPC SP3 is required. Optimum performance will be achieved from SPPC-SP11 for hand preparation, or blasting to Sa2 (ISO 8501-1:2007) or SSPC-SP6.

Ultra High Pressure Hydroblasting / Abrasive Wet Blasting: May be applied to surfaces prepared to Sa2 (ISO 8501-1:2007) or SSPC-SP6 which have flash rusted to no worse than Grade HB2M (refer to International Hydroblasting Standards). It is also possible to apply to damp surfaces in some circumstances. Further information is available from International Protective Coatings.

Aged Coatings
Interplus 256 is suitable for overlap onto most aged coating systems. Loose or flaking coatings should be removed back to a firm edge. Glossy epoxies and polyurethanes may require abrasion..

Technical Details


  • Highways Agency Registered Approved - Item No. 115


Interplus 256 will generally be applied to bare steel but is fully compatible for overlap onto most aged coatings, in addition to touch up repair of the following primers:

Recommended topcoats/intermediates are:

It should be noted that Interplus 256 is not suitable for overcoating with thin films of alkyd, chlorinated rubber, vinyl or acrylic finishes. For other suitable topcoats/intermediates please consult our Technical Team.

Technical Info

Components: Two Part
Type: Surface Tolerant Epoxy
Finish: Eggshell
Stock Colours: Aluminium
Tintable: No
VOC Content: 2.21 lb/gal (265 g/l)
Volume Solids: 80% 
Suitable Substrates: For steel surfaces
Application Method: Airless Spray, Air Spray, Brush, Roller
Theoretical Coverage: 6.40 m²/litre at 125 microns d.f.t and stated volume solids
Wet Film Thickness (WFT): 94-188 microns
Dry Film Thickness (DFT): 75-150 microns
Induction Time: -
Pot Life: 90 minutes at 15°C
Touch Dry: 6 hours at 25°C
Overcoatable: After 11 hours at 25°C
Hard Dry: 11 hours at 25°C
Cleaner / Thinner: Do not thin more than allowed by local environmental legislation: International GTA220. Clean up with International GTA822 or International GTA415
Shelf Life: 12 months (Part A) and 24 months (Part B) minimum at 25°C (77°F). Subject to re-inspection thereafter. Store in dry, shaded conditions away from sources of heat and ignition.
Packaging: Available in 5 Litres

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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