Page 49 - Market Analysis Report of Optical Communications Field in China & Global market 2019

tension of the core are set to 30±5N. The production speed scale beam combustion, smoke density and acid gas
is recommended not to exceed 60m/min in order to avoid concentration test. We have fully tested the flame retardant
the tube being swayed too much and the fiber is damaged performance of the cable and conducted CPR rating on the
due to the excessive speed of the winch. The stranding corresponding test results of the three plans.
pitch must meets the product design requirements. The
filling rope is prepared by low-smoke and halogen-free, 4.3.1 The single vertical burning test
and the outer diameter of the filling rope is equivalent to The single vertical burning test of the optical cable refers
that of the tube, and the deviation is less than 0.1 mm. to the EN60332-1-2 standard. The test results of the three
plans are shown in Table 4:
3.3 Sheathing process Table 4 Single vertical burning test data
According to the certification requirements, the flame-
retardant air-blowing micro-cable sheathing material
must use high-flame-retardant LSZH material. The most
important part of the sheathing process is the extrusion
stability of the sheath material during the produce process.
The tension of the cable core is basically maintained at
35±5N. Different flame retardant properties and air blowing
properties were studied according to the schemes. In order Fig.2. Single vertical burning schematic
to facilitate the stripping of the cable, two symmetrical tear
cords are added under the outer jacket. Also the smoothness
of the jacket surface will directly affects the air-blowing
performance of the micro-cable.

4 Test result
4.1 Mechanical properties
For the three structural plan A, B and C, the test is carried
out by flattening, stretching, and temperature cycling. The
data is shown in Table 3A.
Table 3A.Mechanical performance comparison

4.3.2 Light transmittance test
The light transmittance test of the cable is referred to
EN61034-2. The test results of the three schemes are
shown in Table 5:
Table 5 .transmittance test data

4.2 Air blowing performance
The air blowing performance of the three structural
schemes A, B and C is tested. The test method refers to the
IEC60794-5 standard. The test results are shown in Table
3B.

Table 3B.Air blowing test data 4.3.3 Bundled combustion performance
The bundled burning test of optical cable is based on GB/T
18380.35-2008.Combustion test of cables and cables under
flame conditions.Part 35: Vertical vertical test of bundled
wire and cable flames in category C, with reference to
EN50399; test results for three scenarios are shown in
Table 6:

4.3 Flame retardant performance 4.3.4 Acid gas concentration test
The flame-retardant performance of the optical cable The light transmittance test of the cable is referred to EN
is based on the CPR related standard (EN13501-6 60754; the test results of the three schemes are shown in
cable product grade classification standard). The test Table 7:
items include single vertical combustion, C-class large-

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