School of Civil Engineering

SRK16

  1. Home
  2. Cladding Materials Library

Material description

Material ID: SRK16

Material type: Flexible membrane consisting of polytetrafluoroethylene (PTFE) containing a layer of interwoven glass fibres.

Polymer: Polytetrafluoroethylene (99%)

Additives (fire retardants, fillers or traces of inorganic elements): Calcium (1%), traces of other elements (<1%)

 

Table 1. Estimated mass concentration of compounds.
CompoundMass Concentration (%)
Polytetrafluoroethylene (PTFE)99
Calcium (Ca)1
Traces of strontium (Sr)<1
Traces of potassium (K)<1
Traces of titanium (Ti)<1
Traces of iron (Fe)<1
Traces of barium (Ba)<1
Traces of silicon (Si)<1

A. Material composition identification

A.1 Attenuated total reflection – Fourier transform infrared spectroscopy (ATR-FTIR)

Table 2. FTIR compound identification.
Identified Compounds
Polytetrafluoroethylene (PTFE)
...
Figure 1 . FTIR spectra: Absorbance percentage versus wavenumber from the sample.
...
Figure 2. FTIR spectra: Absorbance percentage versus wavenumber from the sample and the identified compounds.

A.2 Energy Dispersive X-Ray Fluorescence (EDXRF)

Table 2. Inorganic elements and their mass concentration identified with EDXRF.
ElementMass Concentration (%)
Ca1
Sr<1
K<1
Ti<1
Fe<1
Ba<1
Si<1
...
Figure 3. EDXRF spectra. Counts vs energy. Identified elements are shown as vertical lines.

B. Thermogravimetric analysis

Table 3. Mass fraction of residue after thermal decomposition.
ConditionFraction of mass residue at 800°C
Non-oxidative (nitrogen)0.46
Oxidative (air)0.41
Table 4. Temperature and amplitude of main peaks in non-oxidative conditions.
Peak IDTemperature peak (°C)Amplitude of peak (°C-1)
Peak 15851.004 x 10-2
Table 5. Temperature and amplitude of main peaks in oxidative conditions.
Peak IDTemperature peak (°C)Amplitude of peak (°C-1)
Peak 15661.452 x 10-2
Peak 26862.9 x 10-4
...
Figure 4. Normalised mass (solid line) and derivative of the normalised mass (dashed line) in 150 ml min-1 of nitrogen and a heating rate of 20°C min-1.
...
Figure 5. Normalised mass (solid line) and derivative of the normalised mass (dashed line) in 150 ml min-1 of air and a heating rate of 20°C min-1 .