TECHNOLOGY | WIRE AND CABLE


Table 1: Key properties of Flexalloy 89504-90 and 89504-90FR thermoplastic elastomer PVC compounds ASTM/ UL Test D-2240 D-792 D-638 D638 D-746


Properties and Units


Hardness, Shore A (+/-3, 15 sec.) Specific gravity


Tensile strength, psi Elongation, % Brittle point, ˚C Oxygen index, %


Volume resistivity @ 50˚C, Ohm-cm Dielectric constant @ 1kHz/@ 1 MHz Dissipation factor @ 1kHz/@ 1 MHz


Source: Teknor-Apex


effective way to enhance fire-resistance. Mexichem Specialty Compounds has devel- oped a low smoke plenum PVC compound to replace data cable insulation and jacket materials. The company says current demands on fire alarm and security systems require any cable used for these systems to be installed in plenum air handling spaces and comply with the low smoke and com-


89504-90 90


1.24


2,830 340 -46


D-2863 D-257 D-150 D-150


Max. continuous operating temperature, ˚C UL 2556 UL QMTT2 Recognitions


– 27.0


1.68x1014 4.83/3.18


0.0612/0.0874 105


1.28


2,830 340 -46


29.5


1.68x1014 4.67.3.20


0.0616/0.0805 105


TW, THW, THHW TW, THW, THHW


Flexalloy PVC Elastomer 89504-90 FR 90


bustibility requirements of NFPA 262/UL 910. The new SmokeGuard compound enables manufactur- ers to use a single material as both the insulation and jacket in a variety of cable designs, including fire alarm (FPLP) and security (CL2P/CL3P) cables. Mexichem says the compound was developed to meet exacting benchmark standards, including conforming to the low smoke and combustibility requirements of NFPA 262 / UL 910, as well as the insulation and jacket requirements of UL 1424 (Power-Limited Fire-Alarm Circuits) and UL 13 (Power-Limited Circuit Cables). It also needed to perform optimally at high extrusion rates and be suitable for production of shielded and unshielded cable designs that vary in conductor count and AWG size. The SmokeGuard 1042, 1045, and 1046 series


products are optimised for various customers’ process and cable designs. Customer extrusion trials were performed with acceptable processabil- ity and resulted in cables that complied with the NFPA 262 test, as well as all other requirements outlined in UL 1424 and UL 13. Mexichem developed Megolon HF 8142, a low smoke halogen-free (LSHF) compound initially to


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