ISO 4589-3 Elevated-temperature Oxygen Index Tester

ISO 4589-3 Elevated-temperature Oxygen Index Tester

1. Test standard

EN ISO 4589-3: Plastics-Determination of burning behaviour by oxygen index –Part 3: high-temperature test

2. DIN EN ISO 4589-3 test principle

Fix a sample vertically in the transparent combustion cylinder of the upward flowing oxygen and nitrogen mixture, ignite the top of the sample, and observe the combustion characteristics of the sample, and compare the continuous burning time of the sample or the burning length of the sample with the given standard. In comparison, the minimum value of the oxygen concentration was estimated through a series of experiments at different oxygen concentrations.

For comparison with the specified minimum oxygen index value, three samples are tested and at least two samples are judged to be extinguished according to the standard.

3. ISO 4589-3 Samples size

Sample shape	Size			Application
	Length/mm	Width/mm	Thickness/mm
I	80-150	10±0.5	4±0.5	for molding materials
II	80-150	10±0.5	4±0.5	for foam
III	80-150	10±0.5	≤10.5	for sheet "received state"
IV	70-150	6.5±0.5	3±0.5	Self-supporting moulding materials or sheets for electrical appliances
V	140	52±0.5	≤10.5	For soft film or film
VI	140-200	20	0.02-0.10	For films capable of creating a wound "received state" with a defined rod

4. ISO 4589-3 Specimen ignition method

Method A—Top Ignition Method

Method B—Diffusion Ignition Method

5. ISO 4589-3 Test Method

Both rigid and soft materials can be tested in specific fixtures. The fixture is installed in a transparent combustion canister of oxygen and nitrogen gas mixture flowing upward in a laminar flow manner. After the condition of the sample is adjusted, the room temperature test is usually carried out. When the top surface is ignited, the maximum time of the flame contact surface is 30s, and it is removed every 5s to observe whether the sample burns. This ensures that the sample temperature is not too high, resulting in lower OI values. During diffusion ignition, the flame contacts the vertical side of the sample about 6 mm down. In the film test, the film was wrapped around the rod at 45°, the rod was removed to fix the end of the sample and the top 20mm was cut off.

6. ISO 4589-3 Test material:

Rubber products, sealing strips

Ceilings, ceilings, ceiling coverings

Walls, wall coverings

Textiles, Nonwovens, Curtains, Shade Products

Seats, Seat Upholstery

Flooring (PVC, rubber, aluminum honeycomb panels, etc.)

Foaming material (sponge, melamine foam)

Powder coatings, adhesives, pigments, varnishes

FRP composite material, SMC sheet

fireproof glue

Doors, Windows and Door and Window Frames

Small parts such as armrests, handles, headrests, foldable sheaths, small switches

connector, connecting device

Heating pipes, cooling pipes, corrugated pipes, air conditioning pipes

Other materials