DOWSIL™3-6548 RTV Silicone Foam

Geocel & DOWSIL™ Technologies for fire-rated applications

DOWSIL™ Firestop 3-6548 RTV Silicone Foam is a two-part silicone room temperature vulcanizing (RTV) foam that has been specially formulated to have fire resistant properties coupled with good flexibility under the most demanding conditions. It has been made to withstand high temperatures and to confine such hazards as smoke, fire and gas.

Product info


  • A fire rating of up to 4 hours can be achieved
  • Resists smoke and gas penetration through the seal
  • Blank penetrations can be filled for future cable installations
  • Resistant to ozone, ultra-violet tradiation and temperature extremes
  • Fire resistance tested according to EN1366-4, classified up to EI180 according to EN13501-2 depending on detailing
  • Fire resistance tested according to EN1366-3, classified up to EI60 according to EN13501-2
  • Fire resistance tested according to BS476/22, classified up to four hours integrity depending on detailing
  • Fire resistance tested according to UL1479, classified up to three hours FT depending on detailing
  • Fire reaction tested according to EN1716, EN11925
  • Fire reaction classification E according to EN13501-1


Dark Grey

Technical Information

Where to use Interior
Paintable No
Container Type Pails
Shelf life 24 months
Sizes 20kg pails


Application Instructions

Contact our expert team for advice, training and application instructions for this product!