ASTM C518 ISO 8301 Thermal Conductivity Tester
Product information
ASTM C518 Thermal Conductivity Tester(also known as Heat Flow Meter
Apparatus)is a professional steady-state thermal conductivity
testing instrument that fully complies with international standards
such as ASTM C518, ISO 8301, EN 12667, and GB/T 10295. It adopts
the classic guarded heat flow meter method to accurately measure
the thermal conductivity (λ), thermal resistance (R-value), and
thermal transmittance of various insulation materials within the
range of 0.001–2.0 W/(m·K). The equipment is widely used for
testing XPS/EPS boards, PUR/PIR rigid foam, rock wool, glass wool,
aerogel panels, VIP vacuum insulation panels, rubber-plastic foam,
ceramic fiber boards, composite sandwich panels, and other building
thermal insulation materials. With high-precision temperature
control, automatic pressure application, and one-click intelligent
testing software, it helps manufacturers and laboratories quickly
obtain reliable, repeatable, and traceable thermal performance
data, making it an essential testing instrument for thermal
insulation material R&D, quality control, and certification.
Standard
ASTM C518
Standard Test Method for Steady-State Thermal Transmission
Properties by Means of the Heat Flow Meter Apparatus
ISO 8301
Thermal insulation — Determination of steady-state thermal
resistance and related properties — Heat flow meter apparatus
EN 12667
Thermal performance of building materials and products —
Determination of thermal resistance by means of the heat flow meter
method
Product Application
The ASTM C518 tester is primarily used to measure the steady-state
thermal conductivity (including thermal conductivity k-value and
thermal resistance R-value) of flat, homogeneous materials. It is
suitable for samples typically 5-50 mm thick. The testing scope
focuses on building, insulation, and composite materials, accurate
to the following individual products (based on standard
applicability, not an exhaustive list):
Insulation foam boards: such as XPS extruded polystyrene boards,
EPS molded polystyrene boards, PUR polyurethane foam boards, PIR
polyisocyanurate boards.
Fiberboards and felts: such as fiberglass felt, rock wool boards,
mineral wool felt, cellulose fiber boards.
Rubber and plastic products: such as rubber mats, foam rubber
boards, plastic films, thermoplastic elastomer boards.
Building composite structures: such as sandwich panels
(metal-insulation-metal), gypsum boards, vacuum insulation panels
(VIP).
Ceramic and cement products: such as ceramic fiber boards,
cement-based insulation boards, concrete-filled insulation.
Textile and powder materials: such as textile fabric laminates,
powder-filled insulation materials (such as calcium silicate powder
boards).
Window and specialty materials: such as window glass composite
layers, aerogel boards.
These products must be fully processed, and the testing environment
must be controlled under a standard temperature gradient (typically
10-40°C uniform temperature). Not suitable for liquids, highly
thermally conductive metals, or non-homogeneous samples.
Product Advantages
1. Hot Surface Heater: High-precision programmable control console
for temperature control. Hot surface temperature measurement
resolution is 0.01℃.
2. Cold Surface Heater: Controlled by a constant temperature water
tank, fluctuation is less than 0.05 degrees. Cold surface
temperature measurement resolution is 0.01℃.
3. The installation of protective measurement and control devices
effectively eliminates the influence of the environment on the
test, thereby ensuring the accuracy and repeatability of the test.
4. The instrument is equipped with automatic pressure and automatic
thickness measurement functions. It can detect thermal conductivity
under different pressures.
Technical Parameters
1. Thermal conductivity range and accuracy: 0.0010~3.0000W/mk
(display to 4 decimal places).
2. Measurement accuracy: ±3%.
3. Sample size: 300×300mm, thickness not greater than 10-50mm.
Special sizes can be customized.
4. It can test solid and powder materials.
5. Hot Surface Temperature and Control: Room temperature ~ 100℃
(standard configuration). Higher temperatures, such as 200℃ or
300℃, can be determined according to user requirements. The flat
plate heater
is controlled by a bidirectional thyristor. Accuracy is 0.1°C.
6. Cold Surface Temperature and Control: 5~90℃ (standard
configuration). The cold surface is water-cooled to ensure stable
temperature (precision constant temperature water tank, adjustable
temperature), accuracy is 0.1°C.
7. The sample is precisely clamped by a computer. Pressure range is
0-1000N, resolution is 0.1N.
8. Automatic measurement of sample thickness (0-50 mm). Resolution
is 0.001 mm.
9. The test section is composed of a transparent plexiglass
windshield, with a side-opening door. The test process can be
observed within the instrument.
10. Equipped with protective control devices. These effectively
eliminate the influence of the environment on the test, ensuring
accuracy and repeatability.
