Zinc-plated nano-passivated (silver/yellowish) steel (class 5.8 - tensile strength 500 N/mm²), blue passivated. Ultrasonically and tensile tested.
- Version A: NBR synthetic rubber.- Version B: FPM synthetic rubber (type VITON®, registered mark by DuPont Dow Elastomers). Identification by not black finish.
- Version A: 100°C.- Version B: 180°C.
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