• Envirograf AM Mastic
  • Envirograf AM Mastic

Envirograf AM Mastic

Product 58

This Intumescent Acrylic Mastic is high-pressure for fire protection in joints & between door frames, partitions & walls, around RSJ`s, providing a permanent & flexible seal against fire, smoke and toxic fumes. Good adhesion to all materials.

  • Can be over-painted
  • Standard mastic tube
  • For gaps between 1mm & 60mm
  • Touch dry in approx. 15 mins
  • White, grey, brown & black

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£3.97 Tax incl.


Formulated to provide a permanent, flexible joint between door frames, edges of partitions and walls, Envirograf Intumescent Mastic protects against fire, smoke and toxic fumes. Once dry, the mastic can be over-painted.

Supplied in a standard mastic tube, fitting any normal skeleton gun, in white, grey, brown and black colours.

An aqueous acrylic polymer emulsion, plasticisers, inorganic extenders, reinforcing fillers, surfactants and fungicide.


For use as a seal between door frames and walls, around edges of partitions.

A minimum of 12mm depth is required around ceiling, floor and wall joints in computer areas. This prevents Halon gas escaping.

Around RSJ and wall cement joints, Envirograf Intumescent Mastic can be used in conjunction with Envirograf Intumescent Slabs, Block, Expansion Joint and Type E joint. Type E is an easy sponge type seal for large gaps that can be faced with Mastic.

All surfaces should be sound and clean. Oily surfaces should be wiped with white spirit and then dried. Dry, dusty brickwork must be moistened prior to application of Envirograf Intumescent Mastic, using a normal skeleton gun. Extrude the mastic firmly against the sides of the joint, ensuring firm contact. Overpainting can be carried out after surface skin has formed.

Maximum Joint: 60mm.

For gaps over 60mm, fit Envirograf Intumescent Coated Fireproof Sponge (Product 40) first.

Touch dry in approximately 15 minutes on surface

Clean tools with warm water after use.

Health & Safety

This product is non-hazardous but ingestion may cause obstruction.

General cleanliness in use should be observed.

Use goggles and protective clothing.

Do not allow to enter drains and watercourses

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 ConditionsWe 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.

Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.

It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.

Product Details
Product 58

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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