• Envirograf Intumescent Trunking Pillows

Envirograf Intumescent Trunking Pillows

Product 27

We no longer stock this product, but can recommend as our nearest alternatives:

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.




Ref Trunking size Length Pillow size
TP021 50mm x 25mm 100mm 50mm x 16mm x 100mm
TP022 50mm x 50mm 100mm 50mm x 35mm x 100mm
TP031 75mm x 25mm 100mm 75mm x 16mm x 100mm
TP032 75mm x 50mm 100mm 75mm x 35mm x 100mm
TP033 75mm x 75mm 100mm 75mm x 50mm x 100mm
TP041 100mm x 25mm 100mm 100mm x 16mm x 100mm
TP042 100mm x 50mm 100mm 100mm x 35mm x 100mm
TP043 100mm x 75mm 100mm 100mm x 50mm x 100mm
TP044 100mm x 100mm 100mm 100mm x 70mm x 100mm
TP062 150mm x 50mm 100mm 150mm x 35mm x 100mm
TP063 150mm x 75mm 100mm 150mm x 50mm x 100mm
TP064 150mm x 100mm 100mm 150mm x 70mm x 100mm
TP066 150mm x 150mm 100mm 150mm x 110mm x 100mm
TP084 200mm x 100mm 100mm 200mm x 70mm x 100mm
TP093 225mm x 75mm 100mm 225mm x 50mm x 100mm
TP099 225mm x 225mm 100mm 225mm x 170mm x 100mm
TP126 300mm x 150mm 100mm 300mm x 110mm x 100mm

Trunking carries cables around buildings, passing through walls and floors and penetrating fire barriers. Use Envirograf Intumescent Trunking Pillows to restore integrity to a fire barrier and stop the spread of smoke and fire for up to 3 hours.

The pillows expand during fire at low pressure to seal the space from spreading smoke and fire, and should be used when steel and PVC trunking require cold smoke and fire protection.

Available in a selection of different sizes, complete with cord and retention tag to fix to trunking.

The retaining cord and lug fit inside the trunking, so if the pillow is removed the lid cannot be re-fitted without first replacing the pillow. 

The pillows will initially allow for 30% or less filling of cables and will then compress to allow for 50% cable fill without overheating the cables. If trunking is more than 50% full, then intumescent pads (Envirograf Product 26) should be used.


Intumescent Trunking Pillows are available in a range of sizes to suit standard sizes of trunking. Used where trunking passes through fire rated floors and walls. The pillows are simply pushed into place in the trunking where it passes through walls and floors.

Supplied with a fitted cord and lug which can be attached inside the trunking to ensure pillows will be refitted after removal for maintenance or access.

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

Sponge properties:

  • Physical form/appearance: Solid, voluminous material, more or less elastic.
  • Colour: Varies according to manufacture.
  • Specific gravity: 10-600 kg/m³
  • Solubility in water: Insoluble
  • Odour: None or mild odour
  • Flash ignition point: Between 315ºc to 370ºc
  • Decomposition temperature: Above 180 ºc
  • Thermal energy: 28 000 KJ/kg
  • Stability and reactivity: The product is stable at temperatures between -40 ºc and +12 ºc
  • Auto-ignition point: Between 370ºc to 427ºc (ASTM D 1929)

Test Details:

Test Integrity Insulation
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.

Product Details
Product 27

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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Envirograf Intumescent Pads

We no longer stock this product, but can recommend as our nearest alternatives: Firetherm Electro Pad Firetherm Intuputty 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.

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