What does 49 CFR 173.4 (Small quantities for highway and rail) require?

Short answer

49 CFR 173.4 requires that small quantities of certain hazardous materials be packaged and transported in accordance with specific rules to avoid other regulatory requirements. The maximum quantity of material per inner receptacle or article is limited, and the packaging must meet certain construction and testing standards.

1. The maximum quantity of material per inner receptacle or article is limited to thirty (30) mL (1 ounce) for authorized liquids, other than Division 6.1, Packing Group I, Hazard Zone A or B materials.

2. Each inner receptacle must be constructed of plastic having a minimum thickness of no less than 0.2 mm (0.008 inch), or earthenware, glass, or metal.

3. Each inner receptacle with a removable closure must have its closure held securely in place with wire, tape, or other positive means.

4. The inside packaging must be securely packed in a strong outer packaging.

The rule says

"The maximum quantity of material per inner receptacle or article is limited to (i) Thirty (30) mL (1 ounce) for authorized liquids, other than Division 6.1, Packing Group I, Hazard Zone A or B materials" (49 CFR 173.4(a)(1)(i))

"Each inner receptacle: (i) Is not liquid-full at 55 C (131 F), and (ii) Is constructed of plastic having a minimum thickness of no less than 0.2 mm (0.008 inch), or earthenware, glass, or metal" (49 CFR 173.4(a)(2))

"Each inner receptacle with a removable closure has its closure held securely in place with wire, tape, or other positive means" (49 CFR 173.4(a)(3))

"Unless equivalent cushioning and absorbent material surrounds the inside packaging, each inner receptacle is securely packed in an inside packaging with cushioning and absorbent material that: (i) Will not react chemically with the material, and (ii) Is capable of absorbing the entire contents (if a liquid) of the receptacle" (49 CFR 173.4(a)(4))

In plain English

49 CFR 173.4 is a rule that allows small quantities of certain hazardous materials to be transported with fewer regulatory requirements. To qualify, the materials must be packaged in specific ways, such as limiting the quantity per inner receptacle, using certain types of materials for the receptacle, and ensuring the closure is secure. The rule also requires the packaging to be tested to ensure it can withstand certain conditions, such as drops and compressive loads.

What to do

• Ensure that the maximum quantity of material per inner receptacle or article does not exceed the limits specified in the rule.
• Use inner receptacles that meet the construction and testing standards specified in the rule.
• Securely pack each inner receptacle in an inside packaging with cushioning and absorbent material.
• Mark the outside of the package with the statement "This package conforms to 49 CFR 173.4 for domestic highway or rail transport only."