The standard unlined HVAC hoses leach, none of them should be used.
PTFE lined hoses are the standard, but the PTFE is stiff and kinks, I'll attach a picture showing a piece of 3/8" ID PTFE tubing that has been bent too tightly, and now has permanent kinks.
New Stainless Steel Braided PTFE Hoses with Black Kink Resistant Coating
May 30 2017
We are constantly improving our equipment to raise the bar on standards for the Terpenator©.
All standard hoses are still the same stainless steel braided PTFE lines, but have been upgraded with a kink-resistant coating to prevent damage and prolong the life of each hose, therefore reducing maintenance costs, downtime, and subsequently lost profits. Check out our hoses.
***Note: Do not exceed the specified hose bend radius or the inner PTFE liner will kink and the hose integrity will become compromised and should not be used.
Nylon lined hoses should be ok, they're nearly as chemical resistant, but aren't up to the temperature extremes of PTFE.
1/4″ PLUS II™ hoses are UL recognized assemblies (File SA9737)
The nylon permeation barrier meets SAE requirements J2196 for CFC, HCFC and HFC refrigerants
The moisture barrier provides improved resistance to moisture migration which contaminates expensive refrigerant
1/4″ RYB PLUS II™ hoses are rated for 4000 psi (276 bar) minimum burst and 800 psi (55 bar) maximum working pressure and an operating temperature of -20° to 180°F (-28.8° to 82.2°C)
Minimum bending radius: 6″ (152mm)
Made in the USA
BVV has a couple of new manifolds,