Nullifire SC602 On-Site Intumescent Base Coat


We no longer stock this product, but can recommend Nullifire SC601 Off-Site Intumescent Base Coat as our nearest alternative. Please contact our Technical Team on 0113 2455450 (option 2) or send a message to [email protected] prior to purchase/use for advice on suitability.

Product not available
This Product has been Discontinued


We no longer stock this product, but can recommend Nullifire SC601 Off-Site Intumescent Base Coat as our nearest alternative. Please contact our Technical Team on 0113 2455450 (option 2) or send a message to [email protected] prior to purchase/use for advice on suitability.

Nullifire SC602 On-Site Intumescent Base Coat is a single pack acrylic thin film intumescent basecoat for the protection of internal and semi-exposed structural steelwork, optimised to provide up to 60 minutes fire protection as well as a limited range of sections for longer protection times.

After suitable drying, SC602 applications can be exposed to the weather for up to 6 months provided that ponding water due to rainfall, condensation or other site/transportation/storage circumstances does not occur.

SC602 is designed for on-site application by airless spray - an off-site version (SC601) is also available.

Benefits & Features

  • Easy to apply with simple application
    • Designed for on-site application by airless spray
  • Consistent and reliable, requiring less remedial work
  • Excellent flow characteristics resulting in less defects for a high quality decorative finish
  • Weather resistance (up to 6 months once cured) ensures more effective project planning and flexibility in construction schedules
    • Can be applied from 5°C to 35°C
  • Moisture resistance - SC602 can be applied in a range of weather conditions including high humidity and colder conditions, resulting in reduced project delays due to varying weather conditions
  • Fast drying (compared to water based products in cold or humid conditions) for a quick turn around and shorter sites times for contractors
    • Touch dry in 60 minutes (at 20°C)
    • Recoat after 6 hours (at 20°C)
  • Single pack acrylic thin film intumescent basecoat
  • Protects of internal and semi-exposed structural steelwork
  • Up to 60 minutes fire protection
  • Can be exposed to the weather for up to 6 months
  • Competitive loadings
  • Compatible with various primers and topcoats
  • Off-site (in-shop) grade (SC601) also available
  • Solvent-based
    • Will dry in high humdity and colder conditions
    • Solvent based products allow for the product to be applied in all weather conditions (good all year round product)
    • Water resistant for 6 months after application


Reference Product Name Colour Pack Size
502677 Nullifire SC602 On-Site Intumescent Base Coat Off-white 25 kg drum


Usage Guidelines

Protective Equipment

USE IN WELL VENTILATED CONDITIONS and ensure all recommended protective equipment is worn during handling & use of this product. For full recommendation, refer to safety data sheet.


Necessary Tools

Airless spray equipment is recommended and should match these guidelines:

  • Operating Pressure: Min 3100psi (218 kg/ cm²)
  • Tip Size: 19 – 25 thou
  • Fan Angle: 20° – 40°
  • Hose Diameter: 10 mm (3/8”) (internal diameter)
  • Hose Length: Max. 30 metres.

Inline filters should not normally be used


Substrate Preparation

SC602 should only be applied onto a clean, undamaged, dry, blasted Sa 2.5 and primed steel surface.

  • For recommended primers and topcoats, please consult the Nullifire Approved Primer or Approved Topcoat list.
  • Nullifire has carried out compatibility testing on a wide range of primers and topcoats. Call Nullifire Technical on 020 3917 1776 / Rawlins Paints Technical on 0113 2455450 (option 2) or [email protected] for confirmation of compatibility with SC602.
  • The primer must be applied in accordance with the manufacturer’s instructions.


Pre-Treatment of Substrates

  • All mill-scale must be removed and a blast profile of at least 50 microns and a cleanliness of Sa 2.5 must be achieved before application of recommended primer.



  • Fresh paint can be removed using xylene (FC150). Dried on paint may be removed using a paint scraper. Spray equipment must only be cleaned using xylene (FC150).

Loading Tables

Refer to the Loading Tables Data Sheet for information on:

  • Beams
  • Columns
  • 4 sided hollow columns & hollow beams
  • 3 sided hollow beams

Technical Data

Property Result
Composition A solvent based, multi-coat formulation
Certification BS476 Part 20/21
Cellular Beams YB5
Building Classification C1, C2 and C3 environments only
For full details, please consult Nullifire Specification Guidelines
Specific Gravity 1.36 ±0.02
Volume Solids 72% ±3%
VOC 317 g/litre
Flash point 26°C
Consumption 670 g/m² @ 500 µm DFT
Average Drying Times (at 20°C) To Touch - 60 minutes
To Recoat - 6 hours
To Handle - variable depending on conditions
These figures are given as guidance only. Other factors such as air movement, temperature and coating thickness must be considered.
Service Temperature 5°C to 35°C
Application Temperature 5°C to 35°C
Temperatures above 35°C, thermoplasticity may be observed
Storage Store in secure, dry warehouse conditions between +0°C and +35°C
Shelf Life 12 months when stored as recommended in original unopened container

Optifire+: Reliable and traceable fire protection

Optifire+ is a unique addition to Nullifire intumescent steel coatings that provides full transparency for:

  • Applicators – Ability to ensure product installed on site is correct and to standards
  • Main Contractors - Ability to ensure that specifications are been adhered to
  • Architects and Specifiers - Ensuring your design projects comply to the latest building regulations and fire protection that is identifiable in future years

What is Optifire+ and how does it work?

Optifire+ is a unique and impossible to manipulate pigment. With Optifire+ we can be sure, at any time after the project is completed, that the product specified is the product applied – confidence that the materials submitted through the approval processes are installed to protect customer's assets.

Optifire+ is invisible to the naked eye and is added to Nullifire intumescent steel coatings. It can be identified with the traceability tool.

Why it’s important

As a product identifier, Optifire+ doesn’t change the way intumescent coatings work. But it does stimulate that they are used and are applied correctly. Nullifire intumescent steel coatings can’t be altered without it being visible and application can be checked afterwards.

With Optifire+, Nullifire goes beyond what’s expected and further endeavors to keep residents and emergency services safe, and protect the buildings that they rely on.

Optifire+ is manufactured within the UK. These locally produced products are independently tested and certified according to the highest standard in the industry.


Building owners are now more than ever been urged to act and put the safety of residents first. There’s an increased focus and scrutiny on the effectiveness of fire protection strategies in commercial and residential buildings. Negligence or simply being unable to prove that the proper precautions have been taken means risking legal action.


IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.


Product Details

Data sheet

Base Type
Interior/Exterior Use
Interior, semi-exposed
Suitable Substrates
Level of Protection
Up to 60 minutes fire resistance
Touch Dry (at 20°C)
60 minutes
Dry to Recoat (at 20°C)
6 hours
670 g/m² @ 500 µm DFT
Recommended Thinner/Cleaner
Max. Application Temperature
Min. Application Temperature
Solids by Volume
72% ±3%
317 g/litre
Shelf Life (from date of manufacture)
12 months when stored as recommended in original unopened container
25 kg drum
UN Number

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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