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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): 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:

3254 g/m².

Roll area:

10.96 m² (1.33 x 8.24 m).

Nominal roll weight:

37.5 kg.

Nominal density:

378 kg/m³.

Nominal thickness:

8.6 mm.


No objectionable odour.

Colour/ backing:

Gold/ printed Textron® backing.

Impact sound reduction (Delta Lw):

37 dB.

Emissions (US Carpet and Rug Institute):

Meets low VOC emission criteria. Certified GLP051 Cat CC10 rubber.

Thermal resistance:

1.1 togs.

R value:


Antimicrobial and mildew resistance:


Technical characteristics:

  • Work of compression (minimum 50 J/m²): 140 J/m².
  • Retention of work of compression (minimum 40%): 80%.
  • Compression after dynamic loading: 5.2 mm.
  • Loss in thickness after dynamic loading (maximum 15%): 4.3%.
  • Loss in thickness after static loading (maximum 15%): 4.8%.
  • Resistance to cracking (not greater than 50 mm): Pass.

Test performance to US standards:

  • CFD (Compression Force Deflection): 1.6 PSI @ 25% deflection.
  • CFD (Compression Force Deflection): 3.4 PSI @ 50% deflection.
  • CFD (Compression Force Deflection): 5.6 PSI @ 65% deflection.
  • Recommended use: Heavy traffic 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: KM5.

Green credentials:

  • Recyclable: At the end of the underlay's useful life it can be 100% recycled. MR 2.0: points available. It can be recycled.
  • Recycled content: Contains not less than 65% post-consumer recycled material. MR 4.0: points available. Recycled content.
  • Indoor air quality: Meets or exceeds the industry standard for indoor air quality as established by the CRI Green Label Programme. IEQ 4.3: points available. Product is Green Label Plus certified.
  • Regional materials: Production Facility, Haslingden, BB4 4LS, UK. Where used within 500 miles of production facility, MR 5.0: points available.

Third party certifications

  • CRI: Green Label Plus

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