EuroWire July 2022

Technical Article

Conclusion Lubrizol Engineered Polymers has one of the largest and most complete NHFR TPU portfolios in the world that brings the right solutions for the wire and cable market in the field of automation, sensor, data and drag chain cables, among others. All Estane ZHF flame-retardant TPUs have been developed considering processability and global regulatory compliance to serve wire and cable companies looking for FR solutions that are non-halogenated, while continuing to meet the stringent regulations applied in these sectors. The latest addition to the product portfolio, Estane ZHF 90AM9 NAT 01, combines heat and hydrolytic resistance, high mechanicals, high flame resistance, and UL105°C and VDE 282 compliance in one grade. Additionally, this grade is easy to process, with good surface aesthetics, and contains no plasticiser.

Estane® ZHF 90AM9 NAT 01

Test speed: 500mm/min

Units

UL spec.

Tensile initial

MPa

Min 17.2

32.6

Tensile after 1w heat ageing 136°C

MPa Min 35% of initial

23.1

Elongation initial

%

Min 450%

460

Elongation after 1w heat ageing 136°C

%

Min 85% of initial

527

Table 4 : UL 105°C rating test

3.4.2 Hydrolytic stability test Hydrolytic stability testingwas conducted according to automotive ISO 6277 standard: pieces of extruded strip were hung up in the climate cabinet at 85 per cent humidity and 85°C for 1,000 hours (after the first 500 hours, samples were taken out of the cabinet and tested).

Table 5 summarises the outcome of the tests.

Estane® ZHF 90AM9 NAT 01

Test speed: 500mm/min

Units

Tensile initial

MPa

26.9

Humidity test: After 500 h

MPa

22.0

Humidity test: After 1,000 h

MPa 21.6 (-19.7%)

Elongation initial

%

454

Humidity test: Elongation after 500 h

%

536

Humidity test: Elongation after 1,000 h

%

535

Table 5 : Hydrolytic stability results

3.4.3 VDE 282 accelerated ageing tests Next, we performed accelerated ageing tests, and Table 6 summarises the outcome.

Estane® ZHF 90AM9 NAT 01

Test speed: 250mm/min

Units VDE spec.

Tensile initial

MPa

Min 25

32.2

Tensile after 1w heat ageing 110°C Tensile after 1w hydrolysis 80°C Tensile after 1w oil immersion 100°C Elongation after 1w heat ageing 110°C Elongation after 1w hydrolysis 80°C Elongation after 1w oil immersion 100°C Elongation initial

MPa

± 30% 26.8 (-17.0%)

MPa

± 30% 25.7 (-20.2%)

MPa

± 40% 29.0 (-9.9%)

% Min 300

458

%

± 30% 523 (+14.2%)

%

± 30% 471 (+2.8%)

%

± 30% 498 (+8.7%)

Lubrizol Advanced Materials www.lubrizol.com/engineered-polymers

Table 6 : VDE 282 accelerated ageing tests

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July 2022