ISO 4589-2 Limiting Oxygen Index Tester for Plastic Rubber Flame Retardancy

ISO 4589-2 Limiting Oxygen Index Tester

Introduce

The Limiting Oxygen Index (LOI) tester is a professional equipment used to evaluate the flame retardant properties of materials at room temperature. It is widely used in the combustion characteristics testing of materials such as plastics, rubber, fiber, foam, etc. According to international standards such as ISO 4589-2:2017, ASTM D2863-19 and GB/T 2406.2-2009, the LOI tester precisely controls the ratio of oxygen and nitrogen mixed gases to determine the minimum oxygen concentration (expressed as a percentage) for the material to just maintain stable combustion. The equipment is equipped with a high-precision gas control system, combustion chamber and ignition device, and is suitable for a variety of sample types such as solid materials, films, laminates, etc. The test results provide key data for material research and development, quality control and product certification, and widely serve industries such as construction, electronics, automobiles and aerospace to ensure the compliance of materials with fire safety standards.

Standard

ISO 4589-2:2017:
Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature test

ASTM D2863-19:
Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)

Test Scope

The limiting oxygen index tester is suitable for flame retardant performance testing of various materials, including the following specific types:

Thermoplastics: such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), etc.

Thermosetting plastics: such as epoxy resin, phenolic resin, polyester resin, etc.

Rubber materials: including natural rubber, nitrile rubber, silicone rubber, chloroprene rubber, etc.

Textile fibers: such as polyester fiber, nylon, cotton fiber, aramid fiber, etc.

Foam materials: such as polyurethane foam, polystyrene foam, polyethylene foam, etc.

Film materials: such as polymer films (such as PET films), coating films, etc.

Laminated composite materials: such as glass fiber reinforced plastics (FRP), carbon fiber laminates, sandwich composite materials, etc.

Technical Parameters:

1, The oxygen concentration measurement range: 0~100%；
2, The oxygen concentration in accuracy of ± 0.1%
3, Equipped with nitrogen flow meter；
4, Equipped with oxygen flowmeter；
5. Response time: <10s；
6, The gas flow rate in combustion tube is 40mm / s ± 2mm /s；
7, The gas flow rate in top of the combustion tube is 90mm ± 10mm/s；
8, The portable ignition,injection down 16 ± 4mm, can be adjusted;
9, The measurement time is 5min;
10, Double flow meters and pressure meter: the accuracy is ± 1%;
11, The glass tube is high of 500mm;

Main Features:

1. Imported paramagnetic oxygen concentration sensor with unlimited service life (unlike electrochemical sensors, which have a service life of approximately one year);
2. Equipped with a high-temperature resistant quartz glass cylinder with an outlet inner diameter of 40mm;
3. Equipped with sample holders for both supported and non-self-supporting samples;
4. Mass flow controllers automatically adjust the oxygen and nitrogen flow rates according to the set concentration (unlike float flowmeters, which require manual adjustment of oxygen and nitrogen flow rates);
5. Patented gas flow mixing control unit with nitrogen and oxygen mass flow controllers for precise gas flow control;
6. After setting the oxygen concentration on the screen, the PLC LCD touchscreen control system automatically adjusts the oxygen concentration according to the set value. This provides precise and convenient control;
7. A patented gas mixing chamber ensures more accurate oxygen concentration measurement and more thorough mixing of oxygen and nitrogen;
8. A color LCD touchscreen displays parameters such as flow rate, time, and test results in real time;
9. Dual flow meter and pressure gauge: ±1% accuracy;
10. Equipped with a dedicated igniter for easy operation.

Control System:

1, PLC touch screen with a higher degree of test automation;
2, The system automatically adjusts the oxygen concentration after the value is set;
3, The key electrical components are imported brand, accurate, reliable and durable;
4, With a safety protection circuit;

Specification