What is Low Smoke Zero Halogen standards,and what is the IEC standard for LSZH cable?

 What are Low Smoke Zero Halogen standards？

Low Smoke Zero Halogen (LSZH) standards refer to the specifications and requirements that define the characteristics and performance of cables with LSZH insulation and jacketing. LSZH cables are designed to emit limited smoke and no halogen when exposed to high sources of heat or fire. These standards ensure that LSZH cables meet specific criteria for fire safety and environmental impact.

Key points about LSZH standards:

Definition: LSZH cables are composed of thermoplastic or thermoset compounds that emit limited smoke and no halogen when exposed to high sources of heat.
Fire suppression mechanism: LSZH cables incorporate inorganic fillers, such as aluminum trihydrate (ALTH), which undergo an endothermic chemical reaction when exposed to fire. This reaction absorbs heat energy and releases steam, disrupting combustion and forming a protective char layer.
Reduced toxic and corrosive gas emissions: LSZH cables significantly reduce the amount of toxic and corrosive gas emitted during combustion. This makes them desirable in poorly ventilated areas, such as aircraft, rail carriages, tanks, subsea and offshore installations, submarines, ships, and nuclear facilities.
Standards for measuring smoke output: Several standards describe the processes used for measuring smoke output during combustion. These tests assess the optical density of the smoke released by a standardized material sample exposed to a radiant heat source. The results must be below a certain value for the material to be labeled as low smoke.
Limitations of laboratory tests: It’s important to note that these tests are conducted under laboratory conditions and may not fully replicate real fire scenarios. However, they provide a measure to assess the potential smoke emission of materials and identify dangerous substances before further testing .

What are Low Smoke Zero Halogen standards

What is the IEC standard for LSZH cable?

The IEC (International Electrotechnical Commission) has established standards for LSZH (Low Smoke Zero Halogen) cables to ensure their safety and performance. These standards define the requirements and testing procedures that LSZH cables must meet. Here are some key IEC standards for LSZH cables:

IEC/EN 61034-1/2: This standard specifies a smoke density test performed inside a 3-cubic meter chamber. Certified LSZH cables will have a minimum light transmittance of 60%, ensuring that escape routes remain unobstructed and in reasonably clear view during a fire.
IEC/EN 60754-1: This standard stipulates that LSZH cables must not emit the highly toxic acid gas hydrogen chloride (HCI) more than 0.5%. To certify a cable as LSZH, a testing process is conducted in which cable insulation material is heated to 935ºC for 30 minutes, and the gases produced are absorbed into a catch solution.
IEC 60754-2: This standard measures the pH and conductivity of the solution obtained from the previous test. LSZH materials are defined as having a pH no less than 4.3 and a conductivity not exceeding 10µS/mm.
These standards ensure that LSZH cables emit little smoke, release minimal toxic gases, and have a reduced environmental impact during a fire. Compliance with these standards is crucial for the safety of people and equipment in high-risk environments.

Our cables are of good quality and strictly produced in accordance with international standards. If you have any needs or questions about low-smoke, halogen-free wires, please feel free to contact us.

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