We have our own laboratory for common testing items, and two cooperated labs for regularly authoritative inspection. All extruded plastic profiles are in line with the Chinese standard 2017 version and the European Standard, further more our KAXITE series polyamide thermal insulation strips support OEM for performance.

Due to the great progress and high performance, we were invited as the earliest member of the Chinese National Standard Committee, after years of development, we became the leader of the Chinese National Standard Committee (for revising of GB/T 23615.1-2017).

For the constructional plastic profiles, we do the production and experiment in accordance with the standards below:

  • GB/T 23615.1-2017 Accessorial material for architectural aluminum alloy profiles -- Part 1: Thermal barrier strip of polyamide
  • EN 14024-2004 Metal profiles with thermal barrier -- Mechanical performance Requirement, proof and tests for assessment
  • YS/T 437-2008 Aluminium profiles moment of inertia calculation methods and computing software requirements
  • JG/T 174-2005 Thermal barrier strips for construction industry
  • GB 5237.6 -2012 Wrought aluminium alloy extruded profiles for architecture -- Part 6: Thermal barrier profiles
  • GB/T 8478-2008 Aluminium windows and doors
  • GB/T 8484-2008 Graduation and test for thermal insulating properties of doors and windows
  • JG 175-2011 Insulating aluminum alloy profiles with thermal barrier for buildings
  • UL94 Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
  • ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials
  • NFPA 285 Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components

Authoritative Test

Dimension Test

Ash Test

Mechanical Performance

-30℃ Weatherability

Apart from the shapes of polyamide thermal break which can be tested directly, the custoimzed special shapes can't be tested directly, so we take specimen from the polyamide profiles and do the testing.

Specimen Design

CNC Machining

Specimens Off


Datas Out

Actually, the Chinese standard GB/T 23615.1-2017 has more testing items than the European standard. Further more, we can realize extremely high performance values for customers. According to all of these, we can do the experiment items like below:

performance table of PA66 GF25 Building material -- heat insulation strip

No. Characteristic Size of Thermal Break GB/T 23615.1-2017 KAXITE Customize
1 Density (1.30±0.05)g/cm3 1.25~1.45
2 DSC melting peak temperature ≥255℃ ≥255℃
3 Stress cracking by shaft nail No crack at orifice No crack at orifice
4 Shao hardness HD 80±5 80±10
5 Low temperature notched impact strength(-30℃±2℃) ≥50kJ/m2 ≥50kJ/m2
6 Room temperature longitudinal tensile eigenvalue(23℃±2℃) ≥90MPa ≥100MPa
7 Room temperature longitudinal tensile elongation ≥3% ≥3%
8 Room temperature longitudinal tensile modulus of elasticity ≥4500MPa ≥5500MPa
9 Transverse tensile eigenvalue
 in room temperature (23℃±2℃)
I type(Width<20mm) ≥90MPa 30~140MPa
10 I type(Width≥20mm) ≥80MPa
11 special shape ≥25MPa
12 Transverse tensile eigenvalue
 in high temperature(90℃±2℃)
I type(Width<20mm) ≥55MPa
13 I type(Width≥20mm) ≥45MPa
14 special shape ≥20MPa
15 Transverse tensile eigenvalue
 in low temperature(-30℃±2℃)
I type(Width<20mm) ≥90MPa
16 I type(Width≥20mm) ≥80MPa
17 special shape ≥25MPa
18 Transverse tensile eigenvalue
(Hydrolytic resistance, boiling for 4h or keep in 23℃ water for 1000h)
I type(Width<20mm) ≥85MPa
19 I type(Width≥20mm) ≥75MPa
20 special shape ≥22MPa
21 Transverse tensile eigenvalue
(Thermal aging properties, 140℃ for 1000h)
I type(Width<20mm) ≥60MPa
22 I type(Width≥20mm) ≥55MPa
23 special shape ≥20MPa
24 Typical value of thermal conductivity Heat flow metering method 0.30W/(m·K) 0.30W/(m·K)
25 Linear coefficient of expansion 2.3×10-5K-1~3.5×10-5K-1 2.3×10-5K-1~3.5×10-5K-1
26 Fiberglass Content - 0~70%
27 FLAMMABILITY (UL94) - 94V-0
1. Sample water content less than 0.2% by weight.
2 Normal laboratory condition:23℃±2℃ and 50%土10% relative humidity.