Envirograf Intumescent Expansion Joints
  • Envirograf Intumescent Expansion Joints

Envirograf Intumescent Expansion Joints

Product 39

Intumescent Expansion Joints are made from fireproof sponge clad with intumescent foil, for use as movement or expansion joints in fire walls and floors, concrete slabs and steelwork, as cavity joints between timber structures and brickwork, and anti-vibration around ventilation ducting.

  • Refer to sizes below
  • Unaffected by water or chemicals
  • Easy to install
  • Fireproof up to 2 hours
VAT excluded

£7.97 Tax incl.



Ref Gap Size Width Of Seal
E1/10/25 5-11mm 25mm
E1/20/30 12-20mm 30mm
E1/30/30 21-32mm 30mm
E1/40/30 25-42mm 30mm
E1/50/30 30-52mm 30mm
E1/60/40 42-62mm 40mm
E1/70/50 61-74mm 50mm
E1/90/50 71-95mm 50mm
E1/100/50 91-104mm 50mm
E1/120/50 100-120mm 50mm

Envirograf Intumescent Expansion Joints fill gaps and cavities in buildings. Clad in intumescent foil, this fireproof sponge allows for movement, expansion and contracting between materials and, in the case of fire, will expand to seal the gap to prevent the spread of fire and smoke for up to 2 hours.

Intumescent Expansion Joints are great to use around ventilation ducts to absorb movements caused by vibrations, and used on top of cable trays that pass through protected areas of buildings.


Made in a range of sizes to suit gaps up to 120mm wide the expansion joints are easily installed giving protection to both horizontal and vertical gaps. Simply compress into narrow gaps or apply to one side of a wider gap, using double sided tape on one face to adhere in place. The sponge and intumescent expansion joint allows for movement but, in the event of a fire, will completely fill the gap.

Material Specification:

Multigraf Intumescent material chemical constitution

  • Mineral Wool Fibre 20-70% by weight
  • Exfoliating Graphite 20-60% by weight
  • Organic Binder (including adhesive coating) 5.0-30% by weight

Appearance: Cellular solid, usually black

Typical Physical Properties:

  • Density (kg/m³) 90 - 100
  • Hardness 130 - 180
  • Tensile strength (Newton’s) Min 70
  • Elongation at break % Min 90

Typical Flammability Properties

  • BS476: Part 5 Non ignition
  • BS476: Part 6 Fpi<12
  • BS476: Part 7 Class ‘1'
  • BS476: Part 6+7 Class ‘0'

Test Details:

Test Integrity Insulation
Fulmer Yarsley J84201/6 146 Minutes 110 Minutes
LPC TE 89143 125 Minutes 125 Minutes
LPC TE 82610 183 Minutes N/A

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 39

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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