UN identification number

UN3320: Sodium borohydride and sodium hydroxide…

As listed: Sodium borohydride and sodium hydroxide solution, with not more than 12 percent sodium borohydride and not more than 40 percent sodium hydroxide by mass

UN3320 appears 2 times in the Hazardous Materials Table (49 CFR §172.101). Hazard class 8, packing group II, III.

ID numberUN3320

Hazard class8

Packing groupII, III

Label codes8

All §172.101 entries for UN3320

Proper shipping name	Class	PG	Labels
Sodium borohydride and sodium hydroxide solution, with not more than 12 percent sodium borohydride and not more than 40 percent sodium hydroxide by mass	8	II	8
Sodium borohydride and sodium hydroxide solution, with not more than 12 percent sodium borohydride and not more than 40 percent sodium hydroxide by mass	8	III	8

Open any entry for packaging sections, special provisions, air limits and vessel stowage.

What it means

Class 8 — Corrosive. Materials that destroy skin tissue or corrode steel or aluminum.

Packing group ranks danger within the class: PG II = medium danger; PG III = minor danger.

Label codes (column 6): 8 → Corrosive label.

UN numbers are recognized for international and domestic transport.

Example basic description

UN3320, Sodium borohydride and sodium hydroxide solution, 8, PG II

Proper shipping name shown without the table's italic descriptive text. Order per §172.202: ID number, proper shipping name, hazard class, packing group. Example only — add technical names, “RQ”, quantities and other elements your shipment requires.

What to check next

Match the name. Compare your SDS Section 14 to the proper shipping names above and pick the row with your packing group.
Read the special provisions on the entry page (§172.102) — they can add limits or exceptions.
Check packaging — the entry page lists the Part 173 sections for exceptions, non-bulk and bulk.
Labels & placards. Placarding depends on class and quantity — see Table 1 vs Table 2.
Emergency response. Find the response guide for UN3320 in the current PHMSA Emergency Response Guidebook.

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Common questions about UN3320

What is UN3320?

UN3320 is the identification number for Sodium borohydride and sodium hydroxide solution in the DOT Hazardous Materials Table (49 CFR §172.101).

What hazard class is UN3320?

UN3320 is listed under hazard class 8 (corrosive).

What packing group is UN3320?

Packing group for UN3320: II, III. Where several rows exist, the packing group that fits your material decides which row applies.

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Source: Hazardous Materials Table (49 CFR §172.101), eCFR.gov — current as of Oct 23, 2026. View the official table. Reference only — verify current requirements before shipping.