PIB Welding Agent

From  £37.80  inc VAT
From  £31.50  ex VAT
In stock
From  £37.80  inc VAT
From  £31.50  ex VAT
Product Description

Size: 5L 

Adhesive for use with PIB Sheeting

Need to discusss your enquiry further? Please contact our customer services team at [email protected], who will be happy to help.

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PIB Welding Agent is a fast evaporating solvent used as a welding solvent based on non-aromatic solvents. Used for welding and bonding Plysolene PIB together using application advice below as a guide.


  • Application - Welding Solvent
  • Density - 0.72
  • UN Number - 1268
  • Odour - Low - aliphatic
  • Colour - Clear
  • Flashpoint Degrees C - 25
  • Water Miscible -  No
  • VOC Content %age Volume – 100


PIB sheeting is very easily applied to the insulated pipeline. Suitably sized pieces are cut and wrapped around the outside of the insulation. Endlaps of 80mm should be allowed and 500mm side laps underneath the pipes.

The overlaps are solvent welded by applying Plysolene Welding Agent E with a stiff brush.

The solvent should be applied with a circular scrubbing movement to both surfaces so that they become tacky before the overlap is pressed together. The use of too much solvent can cause premature failure as the excess solvent will continue to dissolve the PIB long after the weld has been made.

PIB is a thermoplastic elastomer and does soften with increases in temperature and therefore it should not be used to hold the insulation in place around the pipe. This should be secured in place prior to covering with PIB.

For very large ductwork/pipelines, having a diameter in excess of 300mm, use 1.0mm or 1.2mm.

For ventilation ductwork, the sheeting should be fully bonded to the fixed insulation material, which should be high density resin bonded glass-fibre or mineral-wool slab. If expanded polystyrene is used, the edges of the polystyrene should be well taped and all sections should butt up to one another to minimise the effects of movement and to prevent a temperature gradient existing over any gap.

The main cause of failure on ventilation ductwork is air leakage within the ventilation system.

Any air leak leads to a build-up of moist air within the insulation material that becomes wet as the air cools and condensation occurs. Over a period of time this can lead to a complete failure of the lagging. The best solution is to eliminate all air leaks, but if this is not possible, very small ventilation holes in the underside of the ductwork can prevent the build-up of moist air within the insulation.

Orders and Delivery

Orders and Delivery

Free delivery if your order is over £300 Inc VAT. Orders under £300 are subject to a £30.00 Inc VAT delivery charge.

When ordering on line you can specify the date of delivery, however we would not be able to specify the time of delivery on that day.

♦ Please note that we have a number of large vehicles, including articulated vehicles that may be used for delivery. Please advise us in the comments on your order if access to the delivery address is limited.

♦ Due to insurance guidelines, delivery personnel are unable to enter private residences. Delivery will be as far as possible to the kerbside of the delivery address. The recipient of the products is responsible for any additional lifting once the delivery has been made. Please bear in mind that Insulation products can be bulky and / or heavy.

♦ The delivery driver will require a signature to confirm the goods have been received.


† Unfortunately we, Insulation Express, cannot deliver to the Highlands & Islands of the UK. However we will be happy to deliver to a freight forwarding company on your behalf.

Returns and Refunds

Returns and Refunds

In the unlikely event that you need to return an item, please contact our team on 0330 123 1885 within 14 days of accepting delivery of the item. Restocking charges may apply. We will discuss this with you upon receipt of the cancellation request. Restocking charges will be applied where the products are no longer required AND NOT for goods returned because either defective or damaged. We usually charge 25% of value (minimum £25.00).

Please note that we cannot accept returns on special orders. Special orders may consist of items sent via third party shipping companies or made to measure products. If you are unsure on whether or not your item is a special order, please contact us on 0330 123 1885 prior to placing the order.

Free delivery on orders over £300! Free delivery on orders over £300 Terms and Conditions apply

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