Yes, except XLR A- and B-series, which offer UL94V-0 material (incl. halogen).
Are the plastics, which you use for inserts etc., free of halogen?
Does tarnishing of silver contacts affect the contact resistance?
Silver has the characteristic to tarnish. This gray looking film is just an optical effect and does not affect the contact resistance or the ability of the contact to take the solder.
Do black chrome shells have grounding disadvantages?
The contact resistance of chromium plated (black chrome) shells is slightly higher than the resistance of nickel-plated shells. That’s usually no problem for all audio transmissions. Regarding EMI at HF transmissions we recommend to use nickel plated cable connectors in combination with chassis connectors with EMI optimized ground contacts.
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