Astro ISS-WI & WO is a water-based intumescent paint system providing fire resistance to structural steel and cast iron of up to 90 mins with a minimum number of coats. A compatible decorative overcoat system ensures the system will enhance the building’s architectural and design features. W optimised for  &  shape steel and hollow bracing. WO optimised for hollow posts.

A compatible decorative overcoat system ensures the system will enhance the building’s architectural and design features. The range of topcoats are either water-based or 2010 compliant and safe to use in accordance with manufacturer’s instructions.

How it works

The heat of a fire triggers a catalytic reaction, causing the expansion of an insulating char layer up to 50 times the paint thickness. This layer keeps the steel below its critical temperature, thus maintaining the structural integrity of the building.

Fire testing

Product performance assessment is based upon UKAS/EGOLF Fire Test Laboratory Certification to BS 476 Part 21 - Fire Resistance to load bearing elements of structures. For certification and compliance with regulations the manufacturer will supply a Certificate of Supply on request.

Preparation and Pretreatment

Steel and cast iron should be free from rust and millscale and primed with Astro HBP Primer to 75 microns DFT ( or alternative good quality anti-corrosive primer compatible with intumescent paints) in accordance with manufacturers instructions. Treat galvanised surfaces with “T” wash/Mordant solution & prime with zinc phosphate or other primer for steel. Astro HBP Primer may be left without further overcoating or decorated with appropriate conventional paint where no fire resistance is required.

To Specify

• Dry Internal: Apply Astro ISS-WI & WO in accordance with Astroflame film thickness schedule to acheive 30, 60 or 90 min
• Visible or occasional modest damp internal areas: Also apply 1 good coat Astro FR Paint
• Wet or External Under Cover: Apply 2nd coat Flame Retardant paint
• Full External Exposure - Contact Technical Dept.

We are happy to provide a quote please fill in our structural steel specification form to ensure we cover all aspects of your fire protection and decorative requirements in our quote.We accept any order size

Prior to application the contractor should contact the Astroflame Technical Department (see below) to obtain a basecoat application schedule.

For help please speak to the technical team on: >> Tel: 01329 844 500 or >> Email: sales@astroflame.com

Application

• Astro ISS-WI & WO may be applied by brush, roller or airless spray. To achieve the best finish in the shortest time, spray application is recommended. Prior to application the contractor should contact the Technical Department and obtain a basecoat application schedule. To assist correct application in accordance with this schedule, a wet film gauge will be supplied with the order. Further wet film gauges will be provided on request.
• Maximum wet film thickness per brush coat – 800 microns
• Maximum wet film thickness per spray coat – 1400 microns

Recoating

Brush/roller application

• Surface touch dry: minimum 2 hours, handle min 24hrs
• Recoat: minimum 6 hours
• Overcoating with Flame Retardant finish: minimum 24 hours

Spray application

• Surface Dry: minimum 4 hours
• Recoat: minimum 10 hours
• Overcoating with Flame Retardant finish: minimum 48 hours

Spray Equipment

Airless Spray Pump

Use equipment recommended by manufacturer for the application of high viscosity intumescent paints.

• Filter size 30 mesh. 10mm hose 3/8” diameter with no whip end

Tip Size

• Tip Size 319, 321, 419, 421

Care should be taken to clean filters regularly. Cleaning should be undertaken with water.

• Astro ISS-WI & WO - 20 kg, 5 kg, 2.5 kg
• Flame Retardant gloss, eggshell, WB satin, WB matt
• BS 4800 & RAL colours, 2.5 lt + 5 lt cans

Composition

Intumescent compounds and resin binders, with high opacity pigments.

VoC

The EU VoC limit for structural steel intumescent paints is 500 gm / litre. This product contains 398 gm / litre.

Technical Advisory And Estimating Service

Our in-house estimators provide realistic, confidential guidance on project costings to contractors and quantity surveyors. They also provided expert advice and assistance with all aspects of specification and application.

Application Conditions

• Maximum Relative Humidity 80%
• Minimum ambient temperature 4°C
• Minimum Steel Temperature 3°C above Dew Point

For data sheets, test reports and more information please copy and paste this link into your browser: https://www.astroflame.com/intumescent-paint-steel-WI-WO.html