In the UL 94 flammability standard, “HBF” stands for Horizontal Burning, Foamed Material. The UL 94 test is a widely recognized method for evaluating the flammability of plastic materials used in devices and appliances. Specifically, the HBF rating applies to foamed materials, such as flexible and rigid foams, to assess their burning characteristics.Talk To Our Team
Compliance
UL 94-2017
ASTM D635
V-0, V-1, V-2 (Vertical Burning Tests)
ASTM D3801
IEC 60695-11-10
Purpose
The UL 94 HBF test determines the flammability of foamed materials by evaluating their ability to self-extinguish after exposure to a flame.
Horizontal Burning Test Apparatus Test Procedure
Place a sample of the foamed material in a horizontal position and expose it to a flame for a specific duration.
Measure the time taken for the material to extinguish and the extent of burning.
Classify the material based on its burning rate and flame spread distance.
Classification
HBF (Horizontal Burning, Foamed): Materials with a slow burning rate and the ability to self-extinguish under specific conditions.
HF-1 (Higher Flammability Performance): Materials with self-extinguishing properties and minimal burning.
HF-2 (Lower Flammability Performance than HF-1 but better than HBF): Materials that may allow small flaming particles to fall.
HBF Flammability Tester Main Performance Parameters
Parameter
Description
Combustion Box
Volume: 9.0L; processed with CNC machine tools, ensuring a smooth arc shape.
Exhaust System
Equipped with a strong extraction system to discharge exhaust outdoors when the test is completed.
Burning Torch
Power: 50W, meeting ASTM D5027 requirements.
Crater Diameter
Inner: φ9.2±0.1mm, Steam Outlet: φ9.0±0.3mm.
Nozzle Height
Distance from the air inlet: 100±10mm (meets ASTM D5027 requirements).
