1.C.8.Non-fluorinated polymeric substances as follows:

a. Imides as follows:
1. Bismaleimides;
2. Aromatic polyamide-imides (PAI) having a 'glass transition temperature (Tg)' exceeding 563 K (290°C);
3. Aromatic polyimides having a 'glass transition temperature (Tg)' exceeding 505 K (232°C);
4. Aromatic polyetherimides having a 'glass transition temperature (Tg)' exceeding 563 K (290°C);
Note 1.C.8.a. applies to the substances in liquid or solid "fusible" form, including resin, powder, pellet, film, sheet, tape, or ribbon.
N.B. For non-"fusible" aromatic polyimides in film, sheet, tape, or ribbon form, see 1.A.3.
b. Not used since 2014
c. Not used since 2006
d. Polyarylene ketones;
e. Polyarylene sulphides, where the arylene group is biphenylene, triphenylene or combinations thereof;
f. Polybiphenylenethersulphone having a 'glass transition temperature (Tg)' exceeding 563 K (290°C).
Technical Notes
1. For the purposes of 1.C.8.a.2. thermoplastic materials, 1.C.8.a.4. materials and 1.C.8.f. materials, the 'glass transition temperature (Tg)' is determined using the method described in ISO 11357-2:1999 or national equivalents.
2. For the purposes of 1.C.8.a.2. thermosetting materials and 1.C.8.a.3. materials, the 'glass transition temperature (Tg)' is determined using the 3-point bend method described in ASTM D 7028-07 or equivalent national standard. The test is to be performed using a dry test specimen which has attained a minimum of 90% degree of cure as specified in ASTM E 2160-04 or equivalent national standard, and was cured using the combination of standard- and post-cure processes that yield the highest Tg.