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Durafit 650 International

Durafit 650 International

Interfloor Ltd Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

Underlay suitable for the double-stick and stretch-fit installation of carpets and natural floor coverings, including use with underfloor heating.

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Underlay suitable for the double-stick and stretch-fit installation of carpets and natural floor coverings, including use with underfloor heating.

Features and benefits:

  • Crumb rubber (reinforced).
  • End use classification (to BS 5808): HC/U, heavy contract use.

General information


Pr_35_57_11_74 Rubber crumb underlaysPrimary


M50/170 Carpeting

M50/25 Carpeting

Product range

Carpet Underlays

Specification data - Rubber crumb underlays

Product Reference

Durafit 650 International, TADURA650

Standard product features

Nominal square weight:

2700 g/m².

Nominal density:

415 kg/m³.

Roll area:

15.07 m² (1.37 x 11 m).

Nominal roll weight:

40.08 kg.

Nominal thickness:

6.5 mm.


No objectionable odour.

Colour/ backing:

Black/ Bacloc backing.

Thermal resistance (togs):

1.10 togs.

Impact sound reduction (Delta Lw):

28 dB.


Certified: ID # GLP051.

French VOC Emission Regulations:

Complies A+.

Antimicrobial and mildew resistance:


Technical characteristics:

  • Work of compression (minimum 50 J/m²): 86 J/m².
  • Retention of work of compression (minimum 40%): 91.5%.
  • Compression after dynamic loading: 2.1 mm.
  • Loss in thickness after dynamic loading (maximum 15%): 4.3%.
  • Loss in thickness after static loading (maximum 15%): 8.7%.
  • Resistance to cracking (not greater than 50 mm): Pass.
  • Breaking strength (length/ width, minimum 40N): 744/ 325 N.
  • Extension under force (length/ width, maximum 10%) @ 40N: 2.1/ 0.9%.

Test Performance to US Standards:

  • CFD (Compression Force Deflection): 6.2 PSI @ 25% deflection.
  • CFD (Compression Force Deflection): 42.7 PSI @ 50% deflection.
  • CFD (Compression Force Deflection): 186.8 PSI @ 65% deflection.
  • Recommended use: Extra heavy commercial class III.


  • Hot metal nut test: Low radius of ignition.
  • US Methenamine Pill Test: Pass.
  • US critical radiant flux: NFPA class I.
  • Reaction to fire classification (tested in conjunction with Axminster 80:20 carpet): Cfl-s1.
  • 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.

Recycled content:

  • Post-consumer: 65%.
  • Pre-consumer: 0%.
  • Virgin: 35%.

Environmental information

Recycled content

Post-consumer: 65% %

Pre-consumer: 0% %

Virgin: 35% %

Third party certifications

  • CRI: Green Label Plus

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