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Federal Register / Vol. 86, No. 151 / Tuesday, August 10, 2021 / Proposed Rules animals. A Category A infectious substance must be assigned to identification number UN2814, UN2900, or UN3549, as appropriate.
Assignment to UN2814, UN2900, or UN3549 must be based on the known medical history or symptoms of the source patient or animal, endemic local conditions, or professional judgment concerning the individual circumstances of the source human or animal.
ii Category B: An infectious substance that is not in a form generally capable of causing permanent disability or life-threatening or fatal disease in otherwise healthy humans or animals when exposure to it occurs. This includes Category B infectious substances transported for diagnostic or investigational purposes. A Category B
infectious substance must be described as Biological substance, Category B
and assigned identification number UN3373. This does not include regulated medical waste, which must be assigned identification number UN3291.

5 Regulated medical waste or clinical waste or bio medical waste means a waste or reusable material derived from the medical treatment of an animal or human, which includes diagnosis and immunization, or from biomedical research, which includes the production and testing of biological products. Regulated medical waste or clinical waste or bio medical waste containing a Category A infectious substance must be classed as an infectious substance, and assigned to UN2814, UN2900, or UN3549, as appropriate.

22. In 173.137, revise the introductory text to read as follows:

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173.137
group.

Class 8Assignment of packing
The packing group of a Class 8
material is indicated in Column 5 of the 172.101 Table. When the 172.101
Table provides more than one packing group for a Class 8 material, the packing group must be determined using data obtained from tests conducted in accordance with the OECD Guidelines for the Testing of Chemicals, Test No.
435, In Vitro Membrane Barrier Test Method for Skin Corrosion IBR, see 171.7 of this subchapter or Test No.
404, Acute Dermal Irritation/
Corrosion IBR, see 171.7 of this subchapter. A material that is determined not to be corrosive in accordance with OECD Guideline for
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the Testing of Chemicals, Test No. 430, In Vitro Skin Corrosion:
Transcutaneous Electrical Resistance Test TER IBR, see 171.7 of this subchapter or Test No. 431, In Vitro Skin Corrosion: Reconstructed Human Epidermis RHE Test Method IBR, see 171.7 of this subchapter may be considered not to be corrosive to human skin for the purposes of this subchapter without further testing. However, a material determined to be corrosive in accordance with Test No. 430 or Test No. 431 must be further tested using Test No. 435 or Test No. 404. If the in vitro test results indicate that the substance or mixture is corrosive, but the test method does not clearly distinguish between assignment of packing groups II and III, the material may be considered to be in packing group II without further testing. The packing group assignment using data obtained from tests conducted in accordance with OECD Guideline Test No. 404 or Test No. 435 must be as follows:

23. In 173.172, revise paragraphs a and b to read as follows:
173.172
tank.

Aircraft hydraulic power unit fuel

a The unit must consist of an aluminum pressure vessel made from tubing and having welded heads.
Primary containment of the fuel within this vessel must consist of a welded aluminum bladder having a maximum internal volume of 46 L 12 gallons.
The outer vessel must have a minimum design gauge pressure of 1,275 kPa 185
psig and a minimum burst gauge pressure of 2,755 kPa 400 psig. Each vessel must be leak-checked during manufacture and before shipment and must be found leakproof. The complete inner unit must be securely packed in non-combustible cushioning material, such as vermiculite, in a strong outer tightly closed metal packaging which will adequately protect all fittings.
Maximum quantity of fuel per primary containment and package is 42 L 11
gallons; or b The unit must consist of an aluminum pressure vessel. Primary containment of the fuel within this vessel must consist of a welded hermetically sealed fuel compartment with an elastomeric bladder having a maximum internal volume of 46 L 12
gallons. The pressure vessel must have a minimum design gauge pressure of 5,170 kPa 750 psig. Each vessel must
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be leak-checked during manufacture and before shipment and must be securely packed in non-combustible cushioning material, such as vermiculite, in a strong outer tightly closed metal packaging which will adequately protect all fittings.
Maximum quantity of fuel per primary containment and package is 42 L 11
gallons.
24. In 173.181, revise paragraph b to read as follows:
173.181

Pyrophoric materials liquids.

b Steel boxes 4A, aluminum boxes 4B, metal boxes, other than steel or aluminum 4N, wooden boxes 4C1, 4C2, 4D, or 4F or fiberboard boxes 4G;
steel drums 1A1 or 1A2, aluminum drums 1B1 or 1B2, metal drums, other than steel or aluminum 1N1 or 1N2, plywood drums 1D, or fiber drums 1G; or steel jerricans 3A1 or 3A2 or aluminum jerricans 3B1 or 3B2
enclosing not more than four strong, tight metal cans with inner receptacles of glass or metal, not over 1 L 0.3
gallon capacity each, having positive screwcap closures adequately gasketed or alternative closures physically held in place by a means capable of preventing back-off or loosening of the closure due to conditions normally incident to transportation e.g., vibration. Inner packagings must be cushioned on all sides with dry, absorbent, incombustible material in a quantity sufficient to absorb the entire contents.

25. In 173.185, revise paragraphs c3i introductory text and c3iA
to read as follows:
173.185

Lithium cell and batteries.

c
3
i The mark must indicate the UN
number: UN3090 for lithium metal cells or batteries; or UN3480 for lithium ion cells or batteries. Where the lithium cells or batteries are contained in, or packed with, equipment, the UN
number UN3091 or UN3481, as appropriate, must be indicated. Where a package contains lithium cells or batteries assigned to different UN
numbers, all applicable UN numbers must be indicated on one or more marks. The package must be of such size that there is adequate space to affix the mark on one side without the mark being folded.

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