Communication Cable Filler
HAFC-80-A communication cable filler is specifically designed for filling of oil-filled communication cables.
It has excellent water resistance and electrical performance.It is a kind of hot melt complex with water resistance. It shows extremely small shrinkage and excellent stability at high temperature. It is soft and adhesion.
Main Technical Parameters
Color stability @ 130°C / 120hrs
Density @ 20°C (g/ml)
Drop point (°C)
ASTM D 566-93
Flash Point COC - °C
ASTM D 92
Cone penetration @ 25°C (dmm)
ASTM D 217
Oil Separation ﹪
IEC 811-5.1 clause5
OIT @ 190°C (min)
Relative permittivity@ 50Hz, 25°C
Dissipation Factor, 1MHz
<1.0 x 10-3
Volume Resistivity @ 20°C (ohms.cm)
Kinematic Viscosity at 120°C - cst
HAFC-80-A communication cable filler is well compatible with high polymer material,steel and aluminum . But we recommend that the compatibility test should be made before polymer materials are in contact with this compound.
HAFC-80-A communication cable filler is designed for hot filling.
About communication cable
A communication circuit is composed of two symmetrically arranged wires. There are two types of high frequency and low frequency. The former has a maximum transmission frequency of up to 800 kHz, which corresponds to the opening of 180 telephones in a loop; the latter's maximum transmission frequency is generally less than 252 kHz, which corresponds to the opening of 60 telephones in a loop. The electromagnetic field of the symmetrical communication cable is in an open state (Figure 1). The attenuation and loss of the loop are large at high frequencies, and the mutual interference and external interference between the loops are large, and it is difficult to increase the transmission frequency and capacity.
Long-distance symmetrical communication cables consist of four-wire groups of different numbers and different insulation structures. The commonly used form of the four-wire group is the star-stranded group, and some are in the form of complex twisted pairs (Fig. 2). Insulation with paper tape insulation, paper - rope (paper and paper rope) insulation, polyethylene rope - belt insulation, polystyrene rope - belt insulation and foam polyethylene insulation and many other. The high-frequency long-distance symmetrical communication cable has a high transmission frequency, so the requirements on the structural performance of the cable are high. The rope-and-insulated star twist four-wire structure is generally used. Insulating materials commonly used polystyrene, polyethylene. Tape insulation is generally used for low-frequency symmetrical communication cables below 252 kHz.
The telephone cable is a symmetrical communication cable for a smaller area of telephone connection in the city, suburbs, and industrial and mining companies, and is often called a local telephone cable. Its main feature is a large number of logarithms (up to several thousand pairs, typically hundreds or even several pairs). Because the frequency of use is low and the communication distance is near, the cable diameter of the longer-distance communication cable is thin, typically 0.5 mm. The wire group structure of the telephone cable includes three types: twisted pair, star-type twisted group and double-pair twisted group. According to its core insulation and sheath materials can be divided into paper-insulated lead-sheathed cable, polyethylene insulation sheath cable, ointment filled waterproof cable, plastic cable. Two insulated wire conductors in a telephone cable are twisted together at a certain pitch to form an insulated wire pair. The color of the two insulated wire conductors in the wire pair is different (usually red and white) to distinguish them when wiring. The cable core structure of the telephone cable is generally divided into concentric type and unit type (Figure 3). The twisted pitches of adjacent pairs in the same layer should be different to reduce the interaction between calls. There is a pair of flags (blue and white, respectively) in each layer for easy identification when wiring. In 80 pairs or more of cables, there are often preparatory pairs to replace unqualified pairs. The unit cable is composed of 50 pairs or 100 pairs and the corresponding pair twisted to form a basic unit, and then several basic units are twisted into the cable core. After drying, the jacket was extruded to make a cable (see figure).
The telephone cable laid overhead is self-supporting, and the steel cable bears the weight of the entire cable. Since the 1960s, a waterproof cable has been developed that is filled with grease in plastic cables to prevent moisture and moisture.
In order to improve the moisture resistance and stability of communication cables, integrated cable sheaths have been widely used in the city's telephone cables since the 1970s. There are three basic types. 1Alpeth: Extruded a layer of polyethylene sheath outside the core of the cable, and then grounded the 0.2 mm corrugated aluminum strip longitudinally, filled with a polyisobutylene insulating compound, applied a layer of thermoplastic adhesive, and pressed the outermost layer of polyethylene. jacket. 2Stalpeth: A wrinkle-striped steel strip is wrapped around the corrugated aluminum strip, covered with a layer of thermoplastic material, and the outermost layer is extruded with a layer of polyethylene sheath. 3Lepeth: The core of the cable is covered with a polyethylene sheath, which is coated with a layer of viscous thermoplastic material. The outermost layer is extruded with a lead pipe.