PVC – Polyvinyl Chloride – is a soft jacket and primarily used indoors. IMSA 19-1 has a PVC jacket.
PE – Polyethylene – is a more rigid jacket and is primarily used outdoors. IMSA 20-1 has a PE jacket.
Both can be used for aerial and duct applications. Because it is softer and more pliable, PVC has a smaller bend radius than PE.
The only difference between IMSA 19-1 and IMSA 20-1 is the type of jacket.
IMSA 19-1 is constructed with a Polyvinyl Chloride (PVC) jacket, and IMSA 20-1 has a Polyethylene (PE) jacket.