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HENSOGRUND WB Green water-based steel primer 20kg pail
Water-based primer for structural steel

HENSOGRUND WB Green Primer 20KG

★★★★★ 5/5 · 1,039 eKomi Reviews
Water-based, single-pack acrylic primer for blasted, hand-derusted, galvanised and stainless steel, used under HENSOTHERM fire protection coatings.
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HENSOGRUND WB Green Primer 20KG
£162.00
Product Overview

What is this product?

Water-based primer for structural steel

HENSOGRUND WB Green is a water-based, single-pack acrylic primer for structural steel members that have been blasted, hand-derusted or galvanised, and for stainless steel. It is used as the primer under HENSOTHERM water-based fire protection coatings such as HENSOTHERM 471 KS.

Substrates

  • Steel blasted to Sa 2½, or mechanically prepared to St 3 / PSt 3
  • Galvanised steel (fully degassed before application)
  • Stainless steel (roughened with a non-ferritic abrasive)

Product characteristics

  • Non-VOC: below 1 g/m² at nominal film thickness
  • No hazard labelling required
  • Good adhesion on galvanised surfaces
  • Free of halogens, TCEP, SVHC, cadmium, mercury, bromine, silicone and plasticisers
  • Colour: light grey, matt
  • Registered in the DGNB Navigator: DT4DUX

Technical data

  • Blasted steel (Sa 2½): 233 g/m² (200 µm wet, 80 µm dry)
  • Galvanised steel: 175 g/m² (150 µm wet, 60 µm dry)
  • Dust dry after approx. 60 minutes, ready for HENSOTHERM after 24 hours (60 µm dry film, +20°C)
  • Apply by airless spray (nozzle 0.011 to 0.015 inch, 120 to 150 bar), roller or brush
  • Thin with 0 to 3% water
  • Air and surface temperature +15°C to +25°C during coating, never below +10°C or above +30°C, relative humidity max. 80%

Documents

Why choose this product?
  • ✓
    Non-VOC, below 1 g/m²
  • ✓
    No hazard labelling required
  • ✓
    Good adhesion on galvanised surfaces
  • ✓
    Free of halogens, TCEP, SVHC, cadmium, mercury, bromine, silicone and plasticisers
  • ✓
    Registered in the DGNB Navigator (DT4DUX)
Technical Information

Specifications & Documents

Full technical data and downloadable certification for compliance records.

Finish Light grey, matt
Application Method Airless spray (nozzle 0.011 to 0.015 inch, 120 to 150 bar), roller or brush
VOC Content Below 1 g/m² at nominal film thickness (non-VOC)
Shelf Life Minimum 12 months unopened at +20°C from date of manufacture
Using This Product

How to Apply

Simple application with standard tools — no specialist equipment required.

  1. 1
    Prepare steel for HENSOGRUND WB Green
    Blast to Sa 2½ (DIN EN ISO 12944-4), or prepare mechanically to St 3 / PSt 3. Galvanised steel must be fully degassed and cleaned. Stainless steel is roughened with a non-ferritic abrasive.
  2. 2
    Check conditions for HENSOGRUND WB Green
    Air and surface temperature +15°C to +25°C, never below +10°C or above +30°C. Surface at least 5°C above dew point, relative humidity max. 80%.
  3. 3
    Apply HENSOGRUND WB Green
    Apply by airless spray (nozzle 0.011 to 0.015 inch, 120 to 150 bar), roller or brush. Thin with 0 to 3% water. 233 g/m² on blasted steel, 175 g/m² on galvanised steel.
  4. 4
    Allow HENSOGRUND WB Green to dry
    At 60 µm dry film and +20°C: dust dry after approx. 60 minutes, ready for HENSOTHERM after 24 hours. Each coat must pass the fingernail test.

Coverage Guide

Blasted steel (Sa 2½) 233 g/m² (80 µm dry)
Galvanised steel 175 g/m² (60 µm dry)
Ready for HENSOTHERM after 24 hours
Common Questions

Frequently Asked Questions

Can't find what you're looking for? Call us on 02920 026582 or use live chat for free expert advice.

HENSOGRUND WB Green is a water-based, single-pack acrylic primer for structural steel that has been blasted, hand-derusted or galvanised, and for stainless steel, used under HENSOTHERM fire protection coatings.

HENSOTHERM 410 KS, 421 KS and 471 KS.

233 g/m² (80 µm dry) on blasted steel (Sa 2½), and 175 g/m² (60 µm dry) on galvanised steel.

At 60 µm dry film and +20°C it is dust dry after approx. 60 minutes and ready for HENSOTHERM after 24 hours. Each coat must pass the fingernail test.

Yes. It has good adhesion on galvanised surfaces. The galvanising must be fully degassed first to prevent blistering.

It is non-VOC, with VOC below 1 g/m² at nominal film thickness, and no hazard labelling is required.

Store and transport between +5°C and +30°C, protected from frost and direct sunlight. Minimum shelf life of unopened containers is 12 months at +20°C from the date of manufacture.

Customer Reviews

What Our Customers Say

Verified reviews collected via eKomi — independently moderated and genuine.

5.0
★★★★★
Based on 1,039 reviews
eKomi Gold Seal
  • ★★★★★

    Gave them a ring to ask for some advice, was pointed to exactly what I needed and how much. Arrived promptly and has performed perfectly.

    David H.
    Verified purchase · 2 weeks ago
  • ★★★★★

    Very quick response to query and fast delivery. Easy to use product with good instructions. Great company. Will use again.

    Sarah M.
    Verified purchase · 1 month ago
  • ★★★★★

    Excellent product with swift delivery. Easy to top up fire retardancy after the deck was cleaned. Looks completely untreated which was exactly what we wanted.

    Tom R.
    Verified purchase · 1 month ago