LSZH Environmentally Friendly Cables

We supply a comprehensive range of Low Smoke Zero Halogen (LSZH) cables for use in applications where smoke emission and toxic fumes could pose a risk to human health and essential equipment in the event of a fire.

The cables are also commonly referred to as LSZH cables or halogen free cables. They often have flame retardant properties, making them flame retardant low smoke (FR-LS) cables.
Unlike PVC cables and those made of other compounds which produce vast amounts of dense black smoke, toxic fumes and acid gas when exposed to fire, LSZH cables produce very low levels of smoke and toxic fume and no acid gases. They are essentially halogen free cables. They are therefore often specified indoors, especially in public areas, and in other hazardous environments and poorly ventilated areas. This includes cars, aircraft, railway carriages and ships. LSZH sheathed cables are commonly used across tunnels and underground rail networks.

The "Low Smoke" element of LSZH cables
According to Part B of The Building Regulations, a leading planning and building regulations resource for England and Wales:
"The primary danger associated with fire in its early stages is not flame but the smoke and noxious gases produced by the fire. They cause most of the casualties and may also obscure the way to escape routes and exits. Measures designed to provide safe means of escape must therefore provide appropriate arrangements to limit the rapid spread of smoke and fumes."
Burning PVC has been found in tests to reduce visibility in the surrounding area by as much as 50% within 10 minutes. After 30 minutes, visibility can be reduced by as 90% making it unnecessarily challenging to escape the area.
By comparison, BS EN 61034 specifies a smoke density test, performed inside a chamber 3m x 3m x 3m. The test is often referred to as the 3 metre cube test. By monitoring the transmittance reduction of a white light beam running from one side of the chamber to the other at a set height, the build-up of smoke inside the chamber can be measured. For a cable to be classified as low smoke it will often have a minimum light transmittance of 60%. 
The "Zero Halogen" element of LSZH cables
Burning PVC and other cable compounds produce a number of chemicals, including hydrogen chloride (HCl), which is highly toxic. Furthermore, when mixed with water, HCl forms hydrochloric acid; a substance which is both toxic and corrosive. In the case of PVC, as much as 30% of the emissions can be HCl.
BS EN 60754 stipulates that emissions of HCl by LSZH cables must not exceed 0.5%.

We supply a comprehensive range of Low Smoke Zero Halogen (LSZH) cables for use in applications where smoke emission and toxic fumes could pose a risk to human health and essential equipment in the event of a fire.LSZH cable is low smoke halogen free cable. low smoke emission, namely, reduces the production of harmful objects during combustion. 

Application
The LSZH cable can be referred to as environmental protection cable. It is suitable for the rated voltage of 600/1000V and below with requirements of high safety and environmental protection of the place.. For example, are suitable for tall buildings, seasons, metros, airports, hospitals, great libraries, gyms, schools, shopping malls and other crowded places.
All or part of the sheath of the LSZH cable, the cover, outer shell and auxiliary materials (lining and padding) are composed of flame retardant material of polyethylene, so it has excellent flame retardant characteristics.
When an ordinary cable burns, releases large amounts of smoke and halogenated acid gases. Halogen acid gas will cause corrosion damage to surrounding electrical equipment. It will also have an adverse effect on rescuers and will not be conducive to rescue work in the event of a fire., which in turn will lead to more serious secondary damage.
Nevertheless, low-smoke zero-halogen cables are manufactured from flame-retardant halogen-free polyethylene material for all or part of the outer jacket and supplemental material. This makes it not only more fire retardant, but also free from halogenated acid gases when burning.
 

Characteristics 
LSZH Insulated Cable
If we want to know where low smoke zero halogen cables should be used, we must know its types and characteristics.
The tensile strength of LSZH flame retardant cables is higher than that of PVC wires and cables usually. In the case of PVC cables, the tensile strength is 1,05 KGF/mm2. While, the tensile strength of low smoke halogen-free cables is greater than 1,2 KGF/mm2.
The LSZH cable has good climatic adaptability, can withstand temperatures from -30°C to 105°C. Besides, It has excellent flexibility due to its hardness. 80 a 90. LSZH cables have high volume resistivity. Y 1012 at 1015ω/cm3 is for PVC cables and over 1016ω/cm3 is for Low Smoke Halogen Free cables.
LSZH cables have good resistance to high cable tension. They can withstand voltages greater than 15kV. They also have good elasticity and adhesiveness.

The Differences Between LSZH Cables And Normal Cables
Low smoke halogen free cables do not release halogenated acid gases. Nevertheless, ordinary cables contain halogens in their insulating sheath. When a fire breaks out, large amounts ofhalogenated acid gas. This gas is very corrosive and can increase the spread of a fire.
When the LSZH cable burns, the smoke produced is very small. Instead, ordinary cables emit a lot of smoke during combustion. This hampers the work of the personnel involved and pollutes the environment.. Compared to normal insulated cables, low smoke halogen free cables emit only a very small amount of smoke. The amount of smoke emitted should also be recognized as a low smoke level.

Advantages of LSZH Cable 
1.Free of halogens: Low Smoke Zero Halogen cables are made with environmentally friendly insulation, coating and special materials. This means that it not only has good electrical and physical-mechanical properties, but also avoid secondary pollution by toxic combustion gases.
2.Low smoke emission and low toxicity: This type of cable uses special new sheathing materials. So, no toxic gases are produced during its production and use and it does not pollute the environment. The use of low-smoke, zero-halogen cables is essential in areas with special needs and where there is a high concentration of people.
3.Environmentally friendly: LSZH cable insulation and sheath do not contain heavy metals harmful to human, like lead and cadmium. And the cable is disposed of without contaminating the soil or water. It is more environmentally friendly than conventional cables. So, also known as green cable.
4.High flame retardancy: Green cables can meet the high fire requirements of buildings. The LSZH wires and cables are not easily combustible and prevent the spread of fire and the spread of disasters.. Especially in high-rise buildings, the use of LSZH cables can increase the rescue time and reduce the danger of harmful gases to people.