Model: SHD01-H-02
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Low Smoke ZERO Halogen Compound is based on polyolefin and contains special halogen-free flame retardants and smoke suppressants, which are processed by precise mixing with unique formulas.
- This flame retardant system has excellent zero halogen flame retardancy.
- When the plastic cable sheathing structure is designed reasonably, it can pass the A/B/C type combustion test and meet the light transmittance requirements.
- When burning, no halogen acid gas is released, the amount of toxic and corrosive gas is tiny, and the smoke concentration is shallow.
- This zero halogen flame retardant compound has excellent resistance to environmental stress cracking and good extrusion processability.
- We can also provide anti-termite, anti-rodent, and UV-resistant properties according to customer requirements.
The SHD01-H-02 series of Low Smoke ZERO Halogen Compound not only have excellent low-smoke halogen-free flame retardant properties, but also have excellent extrusion processing properties. It can be extruded on an ordinary PVC extruder. As long as the cooling device is normal, the extrusion processing speed can be accelerated. The performance of the cable compound is better than similar products. The cable compound is suitable for occasions with high flame retardant requirements and low secondary hazards, such as: subways, ships, power stations, high -rise buildings, program-controlled switch rooms, computer rooms and various crowded public places. Suitable for optical cable and wire core working temperature 90 &#; low smoke halogen free flame retardant cable sheath. The cable compound is guaranteed to pass various beam burning tests and light transmittance tests.
The drying temperature is 65°C and the drying time is at least 2 hours. It is advisable for the hot material to enter the extruder. It can be extruded by L/D18-25 extruder. When the screw compression is relatively low, the output is larger. Each zone of the extruder must have a cooling control system, and the melt temperature should not exceed 180 °C. Since the difference between the actual temperature of the melt and the indicated value of the temperature control table varies with the type of extruder, each user should select a suitable temperature according to the specific conditions of the extruder used. The following temperatures can be used as a reference for commissioning:
barrel position
zone 1
zone 2
zone 3
zone 4
nose and mode
Temperature(&#;)
125±5
135±5
145±5
155±5
160±5
Note: If the aluminum-plastic composite inner bag&#;damp proof fails, it should be dried before use. The drying temperature should be 65&#; and the drying time should be at least 2 hours. It is better for hot material to enter and leave the extruder.The machine head can be without a filter screen, or a filter screen below 60 mesh can be used; the mold can be extruded or tube type.
Packing: N.W: 25kg/kg bags with inner bag of aluminum-plastic composite vacuum moisture-proof bag and outer packing being made of kraft paper composite bag or woven bag.
Transportation and storage: It should not be exposed to the sun and rain during transport. It should be stored in a clean, cool, dry and ventilated warehouse. It should be handled with care.
Project name
Units
SHD01-H-02
Normal value
Typical Value
Density
g/cm³
&#;&#;
1.45
Hardness (Shore D1S)
&#;&#;
58
Tensile strength
MPa
&#;10.0
12.5
Elongation at break
%
&#;160
215
Heat aging in air oven (100&#;×168h)
Aging Tensile Strength
MPa
&#;10.0
11.3
Rate of change in tensile strength
%
Max ±30
+15
Elongation at break after aging
%
&#;120
175
Change rate of elongation at break
%
Max ±30
-9.5
Environmental stress cracking resistance
h
&#;96
pass
Heat stress cracking
h
&#;96
pass
Low temperature impact embrittlement temperature
&#;
-25&#;
pass
Volume resistivity at 20&#;
Ω.m
&#;1.0×
3.1×
Dielectric Strength
MV/m
&#;18
37
Oxygen Index
&#;30
38.5
Smoke density is flaming
&#;100
84
Flameless
&#;350
SUNUA are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.
340
Halogen acid gas release amount
mg/g
&#;5
0
PH value
&#;4.3
6.0
Conductivity
µS/mm
&#;10
0.3
Toxicity index
&#;5
0.5
For more information about Low Smoke Zero Halogen Materials, click on the link to contact our product specialists.
Low Smoke Zero Halogen or LSZH is a common term you&#;ll come across when buying or working with cables.
It&#;s not merely a definition of materials or characteristic of cable, but a highly important distinction, which could ultimately mean the difference between life and death.
LSZH cables are also sometimes referred to as ZHLH or simply halogen-free cables.
This definition of the cable basically helps determine the materials that go into the insulation and sheathing of the cable.
Any materials that are not classified as LSZH do not make the cut.
Countries and industries across the world have strict standards for cable materials, and LSZH is becoming increasingly popular because of the safety these cables offer.
Low Smoke Zero Halogen or LSZH cables are those that don&#;t contain any halogens in their material composition and don&#;t produce smoke in case of fire.
These cables produce a very limited amount of smoke and toxic gases, especially acid gases.
These cables are good for use indoors and in hazardous environments where the threat of fire and harmful gases may be high.
They are essentially fire-retardant cables, too, as they self-extinguish.
However, they are not completely fire-resistant, which means they can burn and bear damage if the fire from the source is continuous.
Low smoke and zero halogen are two separate elements.
So it&#;s important to understand them individually.
Low smoke pertains to the cable jacket producing limited smoke.
It doesn&#;t mean that it won&#;t burn or not produce any smoke at all.
It only means that the smoke wouldn&#;t be of dangerously high levels to become toxic, reduce visibility, and hamper rescue efforts.
This is entirely dependent on the jacketing material in the cable, as the sheath is the first layer to come in contact with fire.
In most cases, the flame isn&#;t as dangerous as the smoke and gas it produces.
In indoor settings, most casualties in fire may be caused because of the smoke because it creates respiratory difficulties, reduces the visibility of exit routes, and creates panic.
For instance, tests show that PVC (polyvinyl chloride) can reduce visibility by as much as 50 percent when burning. In half an hour, it can become as high as 90 percent.
This makes PVC high-smoke material; however, there are low-smoke versions of it with appropriate additives.
Many international standardization and certification bodies have specific tests and benchmarks to gauge the smoke emission of materials.
Cables must pass those tests to qualify as low smoke cables.
Zero halogen simply means that no component, primarily insulation and sheathing, should have any halogens in their composition.
Halogens consist of five elements, including Chlorine (Cl), Bromine (Br), Iodine (I), Florine (F), and Astatine (At).
The reason why halogens are emitted from cables is that when the cable is on fire, these can produce toxic gases or liquids, such as highly acidic HCl.
The best example of a material that&#;s not zero halogens is PVC, as it contains Chlorine.
Tests show that PVC can produce as much as 30 percent HCl in case of a fire.
Some cables are labeled as LSF (low smoke and fume), which is different from LSZH.
It only covers part of the equation, as LSF cables might still have halogens in their materials.
For instance, PVC cables that are low smoke are LSF but not LSZH.
Those cables still pose the threat of halogen gases when burning.
Usually, LSF cables have additives to help make them low smoke and low halogen, but they are not zero halogens.
LSZH cables usually follow even stricter standards than LSF cables.
LSF cables can emit halogen acids far beyond the limits set for LSZH cables.
There are two kinds of LSZH materials essentially: thermoplastic LSZH and thermoset LSZH.
Thermoplastic LSZH materials can be molded by heating many times, whereas thermoset LSZH materials can only be molded once.
Hence, they are not recyclable.
While PVC is the most common thermoplastic, it&#;s not an LSZH, as it contains Chlorine.
On the other hand, ethylene-propylene rubber (EPR) and crosslinked propylene (XLPE) are LSZH.
These two materials are very common in cables along with PVC.
It&#;s worth noting that LSZH thermoset materials may not have as high resistance to flames as chlorinated thermosets.
This is one tradeoff when using LSZH cables, as their thermal range may be slightly lower than those with halogens.
That said, crosslinked materials such as XLPE have a much higher thermal range.
The LSZH material you choose comes down to other factors as well, such as voltage rating of the conductor, environmental conditions, and application-specific requirements.
However, the material must meet the set requirements and tests.
LSZH cables are used both indoors and outdoors, but mostly indoors where it&#;s usually hard for the smoke to escape.
Just by that requirement, the applications of such cables are many.
Here are some examples:
LSZH cables may be used in any place where the laws and regulations require cables to use LSZH materials.
Many countries and city governments, as well as safety boards, mandate that contractors and construction companies use such cables for all indoor wiring.
This is why LSZH is becoming a standard for indoor cable applications.
There are obvious advantages to using LSZH cables:
There isn&#;t any universal definition or standard when it comes to LSZH cables.
However, most international standardization bodies have tests and standards for cable manufacturers to comply with in order to certify their cables as LSZH.
Manufacturers must test the cables according to the test describes by those standards.
For instance, the standard BS prescribes a test for smoke density.
The test is performed in a 3 x 3 x 3 cubic meter chamber.
A white light is passed through the chamber at a particular height so as to measure how the smoke hinders the transmittance of light.
The test requires the minimum transmittance to be 60 percent.
Similarly, another British cable standard BS EN requires HCl emissions from the cable to be under 0.5 percent for it to quality as zero-halogen.
International Electrotechnical Commission (IEC) has its own set of standards and tests for qualifying cables as LSZH.
Here are the three most frequently used standards in the cabling industry:
The IEC -1 test for flammability is similar to that of BS , which involves a 3 cubic meter chamber and light transmittance.
The IEC -1 test involves burning the cable for 60 minutes and collecting any halogen acid produced.
It should not exceed 5 mg/g.
The second part, IEC -2, measures conductivity and pH.
The pH value should not be less than 4.3 and the conductivity value should not exceed 10 uS/mm.
LSZH cables also comply with the European Union (EU) Restriction of Hazardous Substances (RoHS) directive.
Other standardization bodies around the world may have similar tests for cables to qualify as LSZH.
The cables are not officially LSZH unless they meet the standards set by one of these bodies.
LSZH cable plays a vital role in ensuring the safety of infrastructure and human life.
While they are not immune to fire, they can reduce the danger.
Low smoke and no risk of acidic gases and fluids make these cables a safer option for indoor cabling.
There are strict standards for such cables, especially on marine shipboard, that must be fulfilled for the cable to be labeled LSZH.
The cable manufacturers must comply with those specific standards for the market they are serving.
As for the cable type and materials, that depends on the application they are for.
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