NAPCA BULLETIN 1-65-94
Recommended Specification Designations for Coal Tar Enamel Coatings
Specification
Symbol
These are recommended enamel coating system designations except for
specialty requirements.
* Part #1
Abr
asiv
e
Bla
st
Pri
mer
93.75
Mils
Min
Enamel
TF --
X
X
X
TG --
X
X
X
X
TGF --
X
X
X
X
TGO--
X
X
X
X
TGSF--
X
X
X
X
**Part #2
* Part #1 Symbol —
Enamel & Wrappers
Fiberglas
s
Innerwra
p
Felt
Wrap
per
Seal
Coat
Oute
rwra
p
X
X
X
X
X
Kraft
Paper
Electric
al
Inspecti
on
X
X
X
X
X
X
X
X
X
X
** Part #2 Symbols
Grades of Enamel
T — Coal Tar
G — Fiberglass Innerwrap
F — Coated Glass Felt or Mineral Felt
O — Fiberglass Outerwrap
S — Seal Coat
3 — Fully-Plasticized Coat Tar
(Ordered by penetration which is dictated by
ambient temperature)
4 — High temperature service coal tar
Example: Full-plasticized coal tar enamel wrapped with fiberglass, felt, and kraft - the symbol
would be TGF - 3.
DISCLAIMER: These specifications may be used in whole or in part by anyone without
prejudice, if recognition of the source is included. The National Association of Pipe Coating
Applicators (NAPCA) assumes no responsibility for the interpretation or use of these
specifications. The intended use of the coatings identified herein is to provide corrosion
protection for buried pipelines. Above ground storage of coated pipe in excess of six months
without additional Ultraviolet protections is not recommended.