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TekTherm™ AK-FR

A2 Fire-Rated Structural Thermal Break

Material Specification

TekTherm™ AK-FR Thermal Breaks are designed to be A2 Fire Rated as well as having a high compressive strength and low thermal conductivity. Compliant for use in buildings above 18m under Document B Building Regulations, this material allows specifiers to meet multiple requirements in one.

TekTherm™ AK-FR has been independently tested and meets A2,s1,d0 (Full laboratory report available on request).  We can supply this as cut pads, strips or in any other shape within the parameters of the material.  


  • Steel to Steel
  • Steel to Concrete
  • Concrete to Concrete
  • Steel to Timber
  • Balconies
  • Canopies
  • Brise-soleil
  • Roof Plant enclosures
  • Façade Systems
  • Balustrading
  • Parapets
  • Man-safe systems
  • Staircases
  • Building Maintenance Units

Steel to Steel Connection

Column Base Connection

Brickwork to Cladding Connection

Steel to Concrete Connection


Compressive Strength at 23°C (73°F)UnitValueTest Standard
CharacteristicMPa (PSI)384.0 (55,694)ISO 826
DesignMPa (PSI)320 (46,412)ISO 826
Mechanical Properties
Flexural StrengthMPa (PSI)165 (23,931)ISO 178
Shear StrengthMPa (PSI)5000ISO 178
Modulus of ElasticityMPa (PSI)9000 (1,305,340)ISO 178
Coefficient of Friction (Static)/0.33/0.35ASTM D1894
Physical Properties
Densityg/cm³ (lbs/ft³)2.15 (+/-0.1) (134)ISO 1183
Water Absorption 24h 23°C (24h 73°F)%<1ISO 12087
Thermal Properties
Operating Temperature°C (°F)-100/ +500 (-148 +932)
Coefficient of Linear Expansion //1.0E-6 / K10DIN 53752
Thermal ConductivityW/m.K
ISO 52612
Flame RetardancyA2,s1,d0EN 13501-1
Thicknesses Availablemm ( “ )5 (0.196)
6 (0.236)
10 (0.393)
12 (0.472)
15 (0.59)
20 (0.787)
25 (1)

Supply Chain Responsibilities

  • Thermal Modelling – Architect
  • Structural Evaluation – Structural Engineer
  • Cost Evaluation – QS
  • Installation – Contractor


The below information is required for quotations

  • Material spec – TekTherm™ AK200, AK300HT or AK-FR
  • Pad dimensions
  • Thickness
  • Number and size of holes
  • Quantity
  • Delivery Address

RoHS Directive       

Hazardous products listed in the EU-directive 2011/65/EU (ROHS-directive), §4 section 1, are not used as ingredients in this material.


  • A2,s1,d0 Fire Rated
  • Asbestos free
  • Low heat conductivity
  • Excellent tolerances with respect to parallelism
  • Long life expectancy > 50 years (dependent on operating conditions)
  • Low water absorption
  • Good hydrocarbon stability
  • Good chemical stability
  • Excellent mechanical durability
  • Very good electrical properties

On and Off-Site Support

We are here to discuss your application and assist you in selecting the right thermal break materials to meet your project specification.

Tekla Plugin available for Thermal Breaks Ltd.

This plugin tool provides easy and efficient design and detailing of our Thermal Break plates within structural steel framed buildings.

United Kingdom United Kingdom

Thermal Breaks Ltd

18 Twyford Business Centre
London Road
Bishops Stortford
CM23 3YT

0800 6444 949
Contact us

United Kingdom United States

Thermal Breaks LLC

3870 La Sierra Ave
Unit #2000
Riverside CA 92505

(951) 519-9855
Contact us

United Kingdom Ireland

Sitetech Products Ltd

Unit 514 Greenogue Business Park
Co. Dublin

+353 401 6554
Contact us