NBS Source
Willow Green

Willow Green

Interfloor Ltd Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

Underlay suitable for the stretch-fit installation of carpets.

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Underlay suitable for the stretch-fit installation of carpets.

Features and benefits:

  • Sponge rubber.
  • End use classification (to BS 5808): GD/U, general domestic use.

General information


Pr_35_57_11_13 Cellular rubber underlaysPrimary


M50/170 Carpeting

M50/25 Carpeting

Product range

Carpet Underlays

Specification data - Cellular rubber underlays

Product Reference

Willow Green, TAWILLOW

Standard product features

Nominal square weight:

2712 g/m².

Roll area:

15.07 m² (1.37 x 11 m).

Nominal roll weight:

40.86 kg.

Nominal thickness:

8.4 mm.

Mean original thickness from nominal thickness (maximum 12%):


Difference between maximum/ minimum original thicknesses (maximum 3 mm):

0.5 mm.


No objectionable odour.

Colour/ backing:

Forest green/ unprinted Textron® backing.

Impact sound reduction (Delta Lw):

32 dB.

Emissions (US Carpet and Rug Institute):

Meets low VOC emission criteria.

Antimicrobial and mildew resistance:


Thermal resistance:

1.1 togs.

Technical characteristics:

  • Work of compression (minimum 50 J/m²): 108 J/m².
  • Retention of work of compression (minimum 40%): 70%.
  • Compression after dynamic loading: 5.3 mm.
  • Loss in thickness after dynamic loading (maximum 15%): 6.3%.
  • Loss in thickness after static loading (maximum 15%): 7.3%.
  • Breaking strength (length/ width, minimum 40N): 182/ 126 N.
  • Extension under force (length/ width, maximum 10%) @ 40N: 2.2/ 1%.
  • Resistance to cracking (not greater than 50 mm): Pass.


  • Hot metal nut test: Low radius of ignition.
  • Russian GOST FR Test Classification: KM5.

Third party certifications

  • CRI: Green Label Plus

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