The Expandastrip Is A Unique Acoustic Sealing Product
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Isocheck Expandastrip

Isocheck expandastrip is an open cell Polyurethane foam, impregnated with chemically stabilised acrylic and backed with a self adhesive scrim tape.

Expandastrip remains permanently elastic and once unpacked and applied will expand to fill the joint, including any irregularities or imperfections. It’s exceptional flexibility and elasticity make it ideal for most unevenly surfaced components and is suitable for use with brickwork, concrete, plastics, steel, timber and fibrous materials.

Expandastrip is supplied on rolls compressed to one sixth of its original thickness and supplied with a self adhesive coating to one side. At its maximum expansion it will provide a light air baffle, however when limited to 25% expansion of its compressed thickness, Expandastrip can provide a weather tight seal against wind and driving rain. Various other situations can be provided for as shown.

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Expandastrip is ideal for joints between precast units, sealing around doors and window frames, or between corrugated roofing panels, roof structures and roof lights ventilation and air conditioning ductwork.

Expandastrip is also used as a primary or secondary seal in vertical and horizontal joints of building facades as well as metal painted cladding systems, window perimeter curtain walling and skylights.

Typical Applications:

  • Acoustic sealing of gaps between floor and wall
  • Weatherproof sealing around windows and doors
  • Weatherproof sealing of profiled sheeting
  • Weatherproof sealing of expansion joints
  • Weatherproof sealing of prefabricated sections
  • Air / Dust sealing of domestic dwellings
Performance level
Classification
Expansion
PF1
Rain tight
Up to 100%
PF2
Thermal / Acoustic
Up to 300%
PF3
Dust / Air baffle
Up to 600%

Range of joint widths which can be filled using compressed thicknesses are shown below. For example:

  • for a 15mm rain tight joint use 3, 5, 6, 8 or 10mm compressed Expandastrip
  • for a 20mm thermal/acoustic joint use 10 or 16mm compressed Expandastrip
  • for a 35mm dust/air baffle joint use 6, 8, or 10mm compressed Expandastrip

Compressed thickness

1.5mm
3mm
5mm
6mm
8mm
10mm
16mm
27mm

 Thickness range (mm)

1.5 – 9
3 – 18
5 – 30
6 – 36
8 – 48
10 – 60
16 – 96
27 – 162

 PF1 (mm)

1.5 – 3
3 – 6
5 – 9
6 – 12
8 – 16
10 – 20
16 – 32
27 – 54

 PF2 (mm)

3 – 4.5
6 – 9
9 – 15
12 – 18
16 – 24
20 – 30
32 – 48
54 – 81

 PF3 (mm)

4.5 – 9
9 – 18
15 – 30
18 – 36
24 – 48
30 – 60
48 – 96
81 – 162

 Roll length

8m
6m
4m
4m
4m
4m
3m
2m

 Roll width

10mm
10mm
15mm
20mm
20mm
25mm
35mm
60mm
Roll dimensions / thicknesses:
Foam composition:
Colour:
Thermal conductivity:
Driving rain seal:
Water vapour diffusion resistance:
Guaranteed life:		 see Performance table
Elastic, fine pore soft polyurethane (PUR) foam with modified polyacrylate impregnation
Black
0.060W/mK
> 600 Pa
< 100
20 years

Isocheck Expandastrip, supplied by Isomass Ltd. Unit 14 Papworth Business Park, Stirling Way, Papworth Everard, Cambridgeshire CB23 3GY and installed in accordance with manufacturer’s instructions / recommendations.

Isocheck Expandastrip product data sheet

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  • Expandastrip has excellent resistance to UV, mildew, ageing and will not crack, split, bleed or dry throughout continuous movement cycles.
  • Expandastrip can be overpainted using any water based acrylic or latex paint.
  • As Expandastrip is non-migratory is compatible with most caulking materials.
  • Because of the permanently flexible seal it is also widely used in the automotive industry to absorb vibration between body shell and dashboard assemblies.
  • Expandastrip is manufactured to ISO 9001 and approved to DIN 18542 and DIN 4102.

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