Fire‑reaction test apparatus for roofs and roof‑covering products (GB 8624, new standard)
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Description
Product Introduction:
This equipment is an instrument designed to evaluate, under simulated real‑world conditions, the fire‑resistance performance of coverings applied to building roof substrates, including insulation layers, vapor barriers, and auxiliary materials, in accordance with Method A.
Product Features:
1. Simple structure, reliable operation, convenient handling, and high machining accuracy and efficiency;
2. The angle control system, driven by a servo motor and equipped with high-precision encoders, ensures the required angular accuracy for testing.
3. The LCD touch screen, in conjunction with the PLC control system, makes testing more convenient.
4. The cabinet is fabricated by welding cold-rolled steel sheets and further enhanced with high-temperature baking paint for increased durability.
Technical Specifications:
| Parameter Category | Parameter content |
| Specimen holder adjustment | The specimen holder angle is controlled by a servo motor and can be adjusted to the 15° or 45° angles required by the test method. |
| Fire Source A Structure | 1. Overall dimensions: 300 mm × 300 mm, depth: 200 mm; 2. A metal frame is fabricated using 3-mm-diameter steel wire, with a mesh size of 50 mm × 50 mm. 3. The metal frame is open at both the top and bottom, with a 10 mm–long protruding foot provided at each of the four corners. 4. The raw material for the wood shavings is softwood such as spruce, pine, and cedar; the shavings are approximately 2 mm wide and 0.2–0.3 mm thick. |
| Plane blade | 1 piece; please bring your own test wood. |
| Measuring instrument | 1 steel ruler with markings |
| Weighing equipment | One electronic scale specially designed for wood shavings, with a weighing accuracy of 0.1 g. |
| Ignition device | One handheld igniter, with flame length freely adjustable. |
| Electrical Parameters | Equipment power supply: 220V |
| Overall dimensions of the machine | Length 2350 mm × Width 1200 mm × Height 1340 mm |
Experimental method:
(1) Test Environment
The test shall be conducted in an environment free from air‑flow disturbances, with the lower end of the specimen positioned 750 mm ± 250 mm above the floor. Prior to testing, the laboratory ambient temperature shall be maintained at 20°C ± 15°C. A fume hood and exhaust system may be installed above the specimen, but care must be taken to avoid generating significant airflow that could affect the test results.
(2) State Regulation
Prior to testing, the test specimen shall be conditioned in an environment at a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5% for at least 72 hours, or until its mass remains constant (as determined by consecutive weighings performed at 24-hour intervals, with a mass difference not exceeding 0.1% of the specimen’s initial mass). Alternatively, other methods may be employed, provided they do not alter the material’s properties; accelerated conditioning to achieve moisture equilibrium is permissible.
(3) Experimental Method A
(4) Experiment completed
(5) Post-test inspection
5 Observation and Testing
1. Overview:
(1) During or after the test, observe and record the test phenomena, and pay attention to:
a) Dimensions are given in mm:
b) Timing starts from the beginning of the test;
c) The propagation of a sustained flame shall be evaluated based on the base of the flame in contact with the fire-exposed surface, rather than the outer flame.
d) If the test roof is a flat roof with a slope of 0°, flame spread or damage in any direction shall be measured.
(2) See Appendix A for the application of the test results.
2 External Flame Spread
(1) On the fire-exposed surface of the specimen, record the time at which a sustained flame propagates upward from the upper edge of the ignition source to reach different positions.
(2) On the fire-exposed surface of the specimen, record the time at which a sustained flame propagates downward from the lower edge of the ignition source to various positions.
(3) Record the time at which any burning materials (burning drips or particles) fall from the fire-exposed surface.
(4) Record the maximum extent of continuous flame propagation upward or downward during the test, expressed as the maximum char length measured from the edge of the ignition source at the end of the test.
3 Flame Piercing
(1) Record the time and phenomena of flame penetration.
(2) Record the time and any observable phenomena associated with the fall of burning materials (burning droplets or particles) from the underside of the specimen.
(3) Record the time and dimensions at which perforation occurs in the specimen.
4 Damage
(1) After the test, record the extent of damage both above and below the edge of the ignition source.
(2) After the test, record the maximum burn lengths of each structural layer of the specimen in the upward, downward, and lateral directions from the edge of the ignition source.
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