BS 476-12 Fire Impingement Test Apparatus for Building Materials

The BS 476-12 Fire Impingement Test Apparatus is designed in accordance with BS 476-12, "Method of test for ignitability of products by direct flame impingement." Its precision complies with the requirements of the relevant standards and meets the control requirements for measurement accuracy.

BS 476-12

1. Voltage: 220V ± 10%, 50Hz.
2. Burner:
   • Ignition Source D: A gas burner consisting of a 185 mm long horizontal stainless steel tube (12.0 mm outer diameter, 9.0 mm inner diameter). The tube is closed at both ends and equipped with a central gas supply inlet. It features a row of 14 holes, each 1.5 mm in diameter, spaced 12.5 mm apart. The holes are arranged so that the gas jets are directed downward at a 45° angle relative to the horizontal plane. The flow meter must be calibrated to ensure a propane gas flow rate of 2 L/min at 25°C.
     Note: Under these conditions, the flame height is approximately 240 mm.
   • Ignition Source E: A gas burner consisting of a 185 mm long horizontal stainless steel tube (12.0 mm outer diameter, 9.0 mm inner diameter). The tube is closed at both ends and equipped with a central gas supply inlet. It features a row of 14 holes, each 1.5 mm in diameter, spaced 12.5 mm apart. The holes are arranged so that the gas jets are directed downward at a 45° angle relative to the horizontal plane.
3. Burner Stand: Includes a movable vertical column containing a stainless steel tube (10 mm outer diameter, 1 mm wall thickness). The end of this tube is fitted with a threaded connector for mounting various burners.
4. Hose: An inner diameter of 5 mm and a length not exceeding 3.0 m, used to connect the flow meter to the burner stand (via a gas valve mounted on the stand).
5. Test Frame: A horizontal steel platform equipped with a sliding burner stand and burner tube assembly. A fixture is provided at one end of the platform to hold the specimen clamp in a vertical position.
6. Specimen Clamp: The vertical specimen clamp must be capable of accommodating the largest-sized specimen. The specimen shall be secured by clamping along its two vertical edges. For narrower specimens, auxiliary clamps may be designed to fit within the widest clamp, ensuring consistent positioning during testing.
7. Burner Carriage and Guide: The ignition source shall be mounted on a support tube attached to a burner carriage. This support tube must be adjustable, allowing for vertical positioning of the ignition source to meet the requirements of different tests. The burner carriage shall be designed to ensure that the distance between the burner and the specimen can be set accurately, repeatably, and automatically; its construction must allow the ignition source to move smoothly to the specified position, with the movement completed within 1 second.
8. Cork Clamp: A clamp for securing the cork.
9. Wind Shield: A wind shield shall be used when employing ignition sources A, B, and C. The shield is constructed from 9 mm thick non-combustible material and is triangular in shape, with a base length of approximately 500 mm and a height of approximately 750 mm.

• Propane and LPG.
• Air supply pipe, compression release valve, safety valve.

• Compressed air: 0–6 kgf.
• Switch valve and pressure gauge.