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Interfloor Ltd Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

Underlay suitable for stretch-fit installation of carpets.

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Underlay suitable for stretch-fit installation of carpets.

Features and benefits:

  • Sponge rubber textured flat.
  • End use classification (to BS 5808): L/U, luxury 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


Standard product features

Nominal square weight:

3458 g/m².

Nominal density:

368 kg/m³.

Roll area:

10.96 m² (1.33 x 8.24 m).

Nominal roll weight:

37.9 kg.

Nominal thickness:

9.4 mm.


No objectionable odour.

Colour/ backing:

Forest green/ printed Textron® backing.

Impact sound reduction (Delta Lw):

35 dB.

Emissions (US Carpet and Rug Institute):

Meets low VOC emission criteria. Certified GLP051 Cat CC2 PU.

Thermal resistance:

1.3 togs.

Thermal resistance (R-value):

0.13 m²K/W.

Antimicrobial and mildew resistance:


Technical characteristics:

  • Work of compression (minimum 50 J/m²): 138 J/m².
  • Retention of work of compression (minimum 40%): 75%.
  • Compression after dynamic loading: 4.5 mm.
  • Loss in thickness after dynamic loading (maximum 15%): 4.5%.
  • Loss in thickness after static loading (maximum 15%): 7.8%.
  • Breaking strength (length/ width) minimum 40N: 182/ 126N.
  • Extension under force (length/ width) maximum 10% at 40N: 2.2/ 1.0%.
  • Resistance to cracking (not greater than 50 mm): Pass.

Test Performance to US Standards:

  • CFD (Compression Force Deflection): 1.5 PSI @ 25% deflection.
  • CFD (Compression Force Deflection): 3.0 PSI @ 50% deflection.
  • CFD (Compression Force Deflection): 6.4 PSI @ 65% deflection.
  • Recommended use: Heavy class II.


  • Hot metal nut test: Low radius of effects of ignition.
  • US Methenamine Pill Test: Pass.
  • US Smoke Chamber Test: Pass.
  • US Critical radiant flux: NFPA class I.
  • Russian GOST FR Test Classification: KM3.

Third party certifications

  • CRI: Green Label Plus

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