Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p77
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 220187–223523

than 5,000 ppm, an average particle size equal to or less than 5 µm and no more than 10% of the particles larger than 10 µm;
b. Not used;
1. C. 007. c. Ceramic‑"matrix" "composite" materials as follows:
1. Ceramic‑ceramic "composite" materials with a glass or oxide‑"matrix" and reinforced with any of the following:
a. Continuous fibres made from any of the following materials:
                     1. Al2O3 (CAS 1344‑28‑1); or
                     2. Si‑C‑N; or

                       Note: 1C007.c.1.a. does not apply to "composites" containing fibres with a tensile strength of less than 700 MPa at 1,273 K (1,000°C) or tensile creep resistance of more than 1% creep strain at 100 MPa load and 1,273 K (1,000°C) for 100 hours.

b. Fibres being all of the following:
                     1. Made from any of the following materials:
                         a. Si‑N;
                         b. Si‑C;
                         c. Si‑Al‑O‑N; or
                         d. Si‑O‑N; and
                     2. Having a "specific tensile strength" exceeding 12.7 x 103m;
1. C. 007. c. 2. Ceramic‑"matrix" "composite" materials with a "matrix" formed of carbides or nitrides of silicon, zirconium or boron;

                N.B.: For items previously specified by 1C007.c. see 1C007.c.1.b.
1. C. 007. d. Not used;
                N.B.: For items previously specified by 1C007.d. see 1C007.c.2.
1. C. 007. e. 'Precursor materials' specially designed for the "production" of materials specified by 1C007.c., as follows:
1. Polydiorganosilanes;
2. Polysilazanes;
3. Polycarbosilazanes;

        Technical Note:
       For the purposes of 1C007., 'precursor materials' are special purpose polymeric or metallo‑organic materials used for the "production" of silicon carbide, silicon nitride, or ceramics with silicon, carbon and nitrogen.
1. C. 007. f. Not used;
                N.B.: For items previously specified by 1C007.f. see 1C007.c.1.a.
1. C. 008. 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 513 K (240°C);
Note: 1C008.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 1A003.
1. C. 008. b. Not used;
c. Not used;
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 1C008.a.2. thermoplastic materials, 1C008.a.4. materials and 1C008.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 1C008.a.2. thermosetting materials and 1C008.a.3. materials, the 'glass transition temperature (Tg)' is determined using the 3- point bend method described