1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 148

G 148 CAP. 60]

Import and Export (Strategic Commodities) Regulations

[1988 Ed.

[Subsidiary]

IL 1760

IL 1763

IL 1767

Compounds of tantalum and niobium (columbium), as follows-

(a) Tantalates and niobates having a purity of 99 per cent or better except

fluorotantalates;

(b) Other compounds containing 20 per cent or more of tantalum in which the niobium

content with respect to tantalum is less than one part per thousand;

(See also Items IL 1649 and IL 1670.)

Note:

This item does not cover single-crystal lithium niobate and single-crystal lithium tantalate, for which see Item IL 1757(1).

Fibrous and filamentary materials which may be used in composite structures or laminates, and such composite structures and laminates, as follows-

(a) Fibrous and filamentary materials having both of the following characteristics:

(1) "Specific modulus" greater than 3.18 x 106 m (1.25 × 108 in);

(2) "Specific tensile strength" greater than 7.62 × 104 m (3 × 106 in);

(b) Fibrous and filamentary materials having both of the following characteristics:

(1) "Specific modulus" greater than 2.54 x 106 m (1 x 108 in);

(2) Melting or sublimation point higher than 1,992K (1,649°C) (3,000°F) in an

inert environment except:

(i) Carbon fibres having a "specific modulus" less than 5.08 x 106 m (2 x 108 in) and a "specific tensile strength" less than 2.54 × 104 m (1 x 106 in);

(ii) Discontinuous, multiphase polycrystalline alumina fibres in chopped fibre or random mat form, containing three per cent by weight or more silica, having a "specific modulus" less than 10 x 106 m (3.92 x 108 in);

(c) Resin-impregnated fibres (prepregs) and metal-coated fibres (preforms) made from

materials covered by sub-items (a) or (b) above;

(d) Composite structures, laminates and manufactures thereof made either with an organic matrix or a metal matrix utilizing materials covered by sub-items (a) or (b) above.

Technical Notes:

1. The term "fibrous and filamentary materials” includes:

(a) Continuous monofilaments;

(b) Continuous yarns and rovings;

(c) Tapes, woven fabrics and random mats;

(d) Chopped fibres, staple fibres and coherent fibres blankets;

(e) Whiskers, either monocrystalline or polycrystalline, of any length.

2. "Specific modulus" is Young's modulus in N/m2 (lbs force/sq in) divided by specific weight in N/m3 (lbs force/cu. in), measured at a temperature of (296±2)K ((23±2)°C) ((73.4±3.6)°F) and a relative humidity of (50±5) per cent. "Specific tensile strength" is ultimate tensile strength in N/m2 (lbs force/sq. in) divided by specific weight in N/m3 (lbs force/cu. in) measured at a temperature of (296±2)K ((23±2)°C) ((73.4±3.6)°F) and a relative humidity of (50±5) per cent.

3. Preforms of glass or of any other material specially designed for the fabrication of optical fibres covered by Item IL 1526(c) and (d).

Technical Note:

Optical fibre preforms are defined as bars, ingots, or rods of glass, plastic or other materials which have been specially processed for use in fabricating optical fibres. The characteristics of the preform determine the basic parameters of the resultant drawn optical fibres.