Can you provide a credible link that states that? You can buy alternative blend refrigerants, yet it is illegal to service it? Something not jiving here.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Even though that is not my quote (I just found the info on a site about Freeze 12), I believe it to be true. All shops (at least the reputable ones) will work with R12 and 134a only, and only have and are certified to use equipment for same. They are supposed to analyze the refrigerant before recovering it so their equipment and refrigerant supply does not contaminate other vehicles from the blended refrigerant. The tech at the shop I use calls it "refrigerant harpies" (refrigerant that has been contaminated with a "blend"). I for one am glad the shop I use will not allow their refrigerant supply to get contaminated, as I use them often. I know that I am getting pure refrigerant, and not a blend of anything else. I would have to agree that Redtek and other HC refrigerants can be vented legally and ethically. However, blends such as Freeze12 and the like should not.
Also, I have read that alternative refrigerants (including HC) are for replacement only, and NOT to be used for "topping off".

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All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

Back to OP's original question. I heard back from Codan. Here's their reply. Sounds like he is not certain about his answer, but it's a start. I've asked him to verify his info. NBR is Nitrile Buna Rubber, aka Nitrile or Nitrile Buna

"Info
4:15 AM (5 hours ago)
Reply
to me
Hi

Hose is not produced for many many years.

Could be an NBR inside.

Hans Andersen
Codan Rubber Danmark A/S
Mobile device
www.codan.com"

__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked