Premfire B1 Straw or Gun?

Premfire B1 – Straw Applied

Sealprem’s Premfire B1 Construction Foam is an air humidity curing prepolymerised mixture in an aerosol can. The can comes with a straw applicator at no additional cost. To apply the foam, you simply remove the cap, install the straw, shake the can and apply. This is a really quick and convenient option for smaller jobs. As with all straw applied foam, you have to get the feel for how much pressure to put on the straw, but once you do, this is a great way to quickly apply Premfire B1 on smaller projects.

However, due to the straws lack of flow control, it often leads to inaccurate placement of the foam. When used in small quantities, straw foams are cheaper and do not involve additional costs.

Product Features

  • Good temperature and sound insulator
  • Strong adhesive properties
  • Adheres to most building substrates (except: Teflon, polyethylene and silicone surfaces)
  • Cured foam is sensitive to UV and direct sunlight
  • Cured foam can be painted
  • Installation of fire protection doors
  • Filling holes and gaps
  • Thermal insulation where high requirements for fire resistance are needed

Premfire B1 – Gun Applied

Contractors who are using Premfire B1 Construction Foam and want a pro applicator may opt to use a gun for application. The gun applicator can also be used with our Premfire B1 Foam can. Shake the can first and apply the bead with the gun, once you’re finished using your Premfire B1, simply close the valve and the whole system is ready to be re-used. You have a number of options for application. If you dial it right in, you have fine control – the foam stops when you stop and starts when you start, and the foam flow is adjustable.

The Sealprem Pro gun is the ultimate applicator for the foam to perform at its peak. It will provide a greater yield, give you less expansion with better structure and more flexibility. Without the need to repair sealed areas, you save the cost of replacement materials and labour as well as time. And with less products used over a longer period, less waste goes into landfill or to pollute nature.

Product Features

  • Economical to use since foam can be precisely dosed.
  • Resistant to solvents, with a light rubber-coated handle.
  • The universal adapter with Teflon exterior facilitates cleaning.
  • The stainless steel needle with the Teflon-coated exterior prevents the foam from sticking


Premfire B1 with Straw
Premfire B1 with Gun

What Would YOU Choose?

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  • Greater yield
  • Less expansion
  • Better structure
  • More flexibility
  • Less waste

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  • Good Yield
  • Lack Of Flow Control
  • Low Cost
  • Quick And Convenient
  • Ideal For Small Projects


Why Sealprem

Sealprem services include fast delivery on sealants and foam products


We pride ourselves on providing a timely and responsive personal service whilst meeting or exceeding our customers’ expectations.
Sealprem produce high quality sealants and foam fillers


Our reputation for quality precedes us. We pride ourselves on maintaining our ISO 9001 accreditation year on year.
Sealprem recognise the requirements for the modern construction industry


With over 100 years’ experience, Sealprem leads the way in market and product knowledge.

Who We Work With

Kingspan insulation and construction
CA Group Limited (OLD, REPLACE)
Platinum System Guarantee