BS476-7 Building Materials Lab Test Equipment Surface Flame Spread Test Apparatus Flammability Machine

BS476-7 Surface Flame Spread Test Apparatus

BS476-7 Product introduction:

The flame spread tester is developed and produced according to the BS476-7 standard, and is used to measure the lateral flame spread performance of building products. The speed of flame spread performance/flame spread speed can evaluate the fire retardant performance of materials.
The device radiates heat through a gas radiation plate and uses an imported heat flux meter to calibrate the radiation heat. The sample is ignited by a mixed gas burner to test the combustion of the material under certain radiation heat conditions; Expose the sample to an area with clearly calibrated radiation flux, measure ignition time, flame spread, and final extinguishing time. The test sample is placed in a vertical position, adjacent to the radiation plate, and exposed in an area with clearly calibrated radiation flux. The ignition flame approaches the test sample but does not come into contact with it. The heated end of the sample is ignited by the evaporated gas on the surface.
After ignition, record the development of the flame front and the time it takes for the flame front to burn horizontally on the sample surface and reach each calibration distance. Further testing the relevant parameters of the material, including ignition heat, sustained combustion heat, critical flow rate, average heat of sustained combustion, total heat release, etc.

Standard:

BS476-7: Fire tests on buildingmaterials and structures Part 7. Method of test to determine the classification of the surface spread off lame of products

Structural characteristics:

3.1. The box is made of stainless steel, which is beautiful and corrosion-resistant; Easy to clean; Main framework: It consists of two independent parts: the burner framework and the sample support framework. The two parts are connected by bolts and have bolts for flexible mechanical tuning.
3.2. The center height of the radiation plate is 1250 ± 100mm, and the angle between the radiation surface of the radiation plate and the front surface can be adjusted by 15 ± 3 °;
3.3. The size of the radiation board is 850mm × 850mm, composed of porous refractory tiles; The radiation intensity can reach about 80kw/m2, and the surface temperature can reach about 850 ℃.
3.4 Burner: (200 ± 10) mm long double hole ceramic tube, inner diameter 3mm, outer diameter 6.4mm, made of hollow steel pipe, equipped with propane and air flow meters, adjustable small flame height to meet the standard (100 ± 20) mm high flame requirements.
3.5. Observation level marking: facilitates users to observe the spread of flames; Made of stainless steel, set horizontally and vertically with a spacing of 50mm;
3.6. Equipped with sample installation guide rails, made of stainless steel. Heat and corrosion resistance; The sample installation is a pull-out type;
3.7 Observation Mirror: Equipped with an adjustable angle observation mirror (750mm × 120mm), the flame spread rate can be observed through the glass mirror and sample rake during the test, and can be automatically recorded through the foot switch.
3.8 Sample clamp size: length 855mm, width 275mm. Made of stainless steel plate with a thickness of (3 ± 0.2) mm;
3.9. One sample chimney, made of 0.5 ± 0.05mm thick stainless steel sheet, equipped with gas and chimney metal compensation thermocouples.
3.10 Calibration Plate: Non combustible plate with a length of (850 ± 1) mm, width of 270mm, and thickness of (25 ± 2) mm, with a drying density of (950 ± 100) kg/m3. There are 8 holes with a diameter of 25mm and a hole spacing of 100mm ± 1mm;
3.11 Backboard and positioning plate: The backboard is 885mm long, 270mm wide, and (12 ± 3) mm thick non combustible board with a drying density of (850 ± 100) kg/m3. The positioning plate material is the same as the backboard and is (25 ± 2) mm wide.

BS 476 Common Standard for Construction Materials:

BS 476-3 fire tests on building materials and components - fire tests on exposed parts of roofs
BS 476-4 fire tests for building materials and structures - Tests for non flammability of materials
BS 476-6 fire tests for building materials and components - Test methods for fire spread of products
BS 476-7 fire testing of building materials and components - Test Method for determining the classification of flame surface spread of products
BS 476-8 fire resistance testing of building materials and components - fire resistance test methods and evaluation of building components
BS 476-11 fire tests of building materials and components - Determination of thermal radiation of building materials
BS 476-12 fire tests of building materials and components - Test Method for flammability of products in direct contact with flame
BS 476-20 fire tests of building materials and components - Test methods for fire resistance of building components (general principles)
BS 476-21 fire tests for building materials and components - Test methods for fire resistance of load-bearing components
BS 476-22 fire tests for building materials and components - Test methods for fire resistance of non load bearing components
BS 476-23 fire tests of building materials and components - Test Method for the contribution of components to the fire resistance of components
BS 476-24 fire tests for building materials and components - Part 24: Test methods for fire resistance of ventilation ducts
BS 476-31.1 fire tests of building materials and components - Methods of measuring smoke penetration through door and window assemblies - Methods of measurement at room temperature.

Flame Spread Index Tester Main parameter: