Limited Quantity Hazmat:
What It Is and What It Gets You
Ship paints, aerosols, adhesives, or other small-container chemicals by truck?
You may qualify for significantly reduced Department of Transportation (DOT) requirements.
The limited quantity (LQ) exception lets you ship certain hazardous materials in small per-unit containers without United Nations (UN)-spec packaging, hazmat labels, shipping papers, or vehicle placards — as long as you meet the inner quantity limits, use strong outer packaging, mark each box with the LQ diamond, and stay under 30 kg gross mass per package (in most standard cases). The material remains regulated hazardous material under the Hazardous Materials Regulations (HMR).
Is This Relevant to You?
- You ship paints, aerosols, solvents, adhesives, cleaning products, cosmetics, or automotive fluids
- Your products come in small individual containers (under 1–5 L or 1–5 kg per unit depending on class)
- You ship primarily by truck or rail
- Your material is Packing Group II or III in the Hazardous Materials Table (HMT)
- Column 8A of the § 172.101 table references a Part 173 section for your UN number
- Your total package gross weight is under 30 kg (66 lbs) in most cases
- You ship bulk quantities or large containers
- Your material is Class 1 (explosives)
- Your material is Class 7 (radioactive)
- Your material is Division 2.3 (toxic gases)
- Your material is Division 6.1 PG I, Hazard Zone A/B (poison-by-inhalation)
- Column 8A in the HMT is blank for your material
- You ship air-primary and your volumes exceed § 173.27(f) limits
Who benefits most
The exception is designed for companies that ship small inner containers (PG II: ≤1.0 L/kg, PG III: ≤5.0 L/kg depending on class), within a strong outer package under 30 kg gross, primarily by ground, where the material appears in Column 8A of the § 172.101 table.
The limited quantity exception reduces your shipping requirements — but it does not eliminate all compliance obligations. Here is what may still be relevant regardless of how you ship.
A 24-hour emergency response telephone number is a line that first responders can call at any time during a hazmat incident to obtain safety information. Under DOT regulations (49 CFR 172.604), it is required on shipping papers whenever hazardous materials are transported. Under OSHA's Hazard Communication Standard (29 CFR 1910.1200), it is also required in Section 1 of every Safety Data Sheet — separate from any shipping requirement.
- DOT / shipping — required on shipping papers when the LQ exception does not fully waive the documentation requirement (e.g. hazardous substances, wastes, marine pollutants, air or vessel transport).
- OSHA / SDS — required in Section 1 of the SDS if your company's name appears on it as the responsible party. Applies to manufacturers, formulators, and private labelers — regardless of how or whether the product is shipped.
- If any shipment inadvertently exceeds a limited quantity threshold, full DOT emergency response requirements apply immediately. Having a provider already in place means you are covered without scrambling.
- If your company name is on an SDS — even for a product you consider low-hazard — OSHA requires a 24-hour emergency number in Section 1. This obligation exists independently of how you ship.
- Hazmat Line provides year-round compliance guidance. If a requirement changes or a question comes up, you have a point of contact — not just a phone number.
- If you need related services — SDS authoring, classification review, or training — Hazmat Line can help you identify the right provider.
What the Exception Actually Gets You
Ground transport is where the LQ exception delivers the most benefit. Here is what changes compared to a fully regulated shipment.
| Fully Regulated Hazmat (Ground) | Limited Quantity Hazmat (Ground) | |
|---|---|---|
| Outer packaging | UN performance-tested specification packaging required | Strong outer packaging (e.g. corrugated box) — no UN spec required |
| Hazmat labels | DOT hazard class labels required on each package | No hazmat labels required — LQ diamond mark replaces them |
| Shipping papers | Hazmat declaration required on bill of lading | Not required in most ground cases |
| Vehicle placards | Placards required on transport vehicle | Not required |
| ERI number on shipping paper | Required on shipping papers | Not required (waived with shipping papers) |
| Package mark | UN number, proper shipping name, PG, orientation arrows as applicable | Square-on-point LQ diamond — that's it |
| Carrier surcharges | Hazmat surcharges typically apply | Often avoidable — carriers may not treat as regulated hazmat |
| Hazmat employee training | Required | Still required — not waived |
| Material classification | Required | Still required — not waived |
The LQ exception still provides some benefit for air and vessel — you avoid UN-spec packaging and some labeling — but the savings are smaller. Air transport requires the Y-mark, shipping papers, and often hazmat labels; quantity limits are stricter. Vessel transport requires the mark on all four sides of any cargo transport unit and shipping papers apply. Ground is where shippers get the full benefit.
Does Your Material Qualify?
Eligibility is determined by the § 172.101 Hazardous Materials Table — you cannot self-designate. Follow this decision path.
Find your UN number or proper shipping name. Check Column 8A. If it shows a reference to a Part 173 section (e.g. "173.150"), LQ may be available. If Column 8A is blank → no LQ exception exists for that entry.
The referenced Part 173 section defines exactly how much hazmat is allowed per inner container. Every inner packaging in the box must stay at or below this limit.
Most standard LQ combination packages are limited to 30 kg (66 lbs) gross mass per package. Palletized units under § 173.156 and manufacturer-to-retailer highway shipments have exceptions. If your package exceeds 30 kg with no applicable exception, full DOT requirements apply immediately.
Most LQ shipments use combination packagings — an inner container inside a strong outer box. UN-spec certification is not required. The outer must be structurally sound and meet general packaging integrity requirements under Subpart B of Part 173.
Inner packaging limits by hazard class
| Hazard Class | Inner Packaging Limit | CFR Section |
|---|---|---|
| Class 3 — Flammable liquids (PG II) | 1 L per inner | § 173.150(b) |
| Class 3 — Flammable liquids (PG III) | 5 L per inner | § 173.150(b) |
| Class 8 — Corrosives (PG II) | 1 L or 1 kg per inner | § 173.154(b) |
| Class 8 — Corrosives (PG III) | 5 L or 5 kg per inner | § 173.154(b) |
| Division 4.1 — Flammable solids (PG II/III) | 500 g per inner | § 173.151(b) |
| Division 4.3 — Dangerous when wet (PG II/III) | 500 g / 0.5 L per inner | § 173.151(d) |
| Division 5.1 — Oxidizers (PG II/III) | 500 g / 0.5 L per inner | § 173.152(b) |
| Division 6.1 — Toxic (PG II/III, non-PIH only) | 500 g / 0.5 L per inner | § 173.153(b) |
| Class 2 — Aerosols | 1 L per inner | § 173.306(a) |
| Class 9 / Miscellaneous | Varies by HMT entry | § 173.155(b) |
When inner packagings are placed into fiberboard trays, then into a fiberboard box banded to a pallet, the 30 kg per-package limit is replaced by a maximum of 250 kg (550 lbs) net hazmat per palletized unit.
Requirements by Hazard Class
Once you've confirmed eligibility, the class-specific sections of Part 173 define your exact requirements. Here are the nuances for the most common LQ classes.
The most common LQ class. PG II limit: 1 L per inner. PG III limit: 5 L per inner. Covers paints, nail polish, solvents, adhesives, most flammable cleaning products. Retail ethyl alcohol products have a specific provision under § 173.150(g). Air limits are significantly tighter.
PG II: 1 L or 1 kg per inner. PG III: 5 L or 5 kg per inner. Covers battery acid, drain cleaners, certain rust removers. Reverse logistics provisions apply under § 173.157 for highway returns of damaged product.
1 L per inner container. Covers hair spray, deodorant, spray paint, WD-40, and similar pressurized consumer products. The aerosol exception is one of the most-used LQ pathways in e-commerce and retail distribution.
PG II/III only — the PIH exception does not apply. 500 g or 0.5 L per inner. Covers certain pesticides, industrial chemicals, and disinfectants. PIH materials have no LQ pathway and face more stringent requirements across all modes.
Section 173.156 provides additional flexibility: the 30 kg gross limit can be exceeded for unitized loads between manufacturers, DCs, and retailers; display packs and shrink-wrapped trays have their own provisions; waste LQ materials have a separate pathway under § 173.12(h).
Marking Requirements & Transport by Mode
The square-on-point mark is required on every LQ package. What else is required depends on how you're shipping.
At least one side or end of outer packaging
Stricter quantity limits apply (§ 173.27(f))
Where the full benefit of LQ applies. No hazmat labels, no shipping papers, no placards, no UN-spec packaging. Only the square-on-point mark on at least one side or end of the outer packaging.
Exception: if your material is also a hazardous substance, hazardous waste, or marine pollutant — shipping papers reinstate. The private motor carrier highway exception (§ 172.315(a)(3)) allows skipping the mark for PG II/III materials when five strict quantity conditions are met, but requires a 24-hour ERI number on each package instead.
LQ still provides some savings on air, but considerably less than ground. The Y-mark is required. Shipping papers and hazmat labels reinstate. Quantity limits per inner packaging are stricter — governed by § 173.27(f) and IATA DGR.
The Y-mark may also be used as a universal alternative for ground shipments where quantities meet the stricter air limits — useful for multi-modal shippers who want one mark on all packaging.
LQ is permitted by vessel, but shipping papers reinstate. The square-on-point mark is required. For cargo transport units (CTUs), the mark must appear on each side and end at a minimum 250 mm per side.
The primary benefit retained for vessel: no UN-spec packaging required. Placarding is still generally waived for individual packages. Check IMDG Code provisions for international waters.
Emergency response number — by scenario
| Transport Scenario | Shipping Paper ERI Required? | Package ERI Required? |
|---|---|---|
| Standard LQ ground — with square-on-point mark | No — waived with shipping papers | No |
| Private motor carrier highway exception (no mark used) | No | Yes — on each package |
| Air transport (Y mark) | Yes — shipping papers required | Yes |
| Vessel transport | Yes — shipping papers required | No |
| LQ material that is also a hazardous substance, waste, or marine pollutant | Yes — shipping papers required | No |
The number must be monitored at all times the hazardous material is in transportation. It must connect immediately to a person knowledgeable about the material — or to a third-party ERI service provider. It cannot be voicemail, an answering service, or a business-hours line.
- Many shippers use third-party ERI service providers under § 172.604(c)(2)
- Must be monitored including nights, weekends, and holidays
- For domestic US shipments, include area code; for international origination, include international access code
In a hazmat incident, first responders call the ERI number for immediate chemical guidance. If no one answers or the number is incorrect, that is a violation of § 172.604 and a direct public safety failure. PHMSA civil penalties can reach tens of thousands of dollars per incident.
Hazmat Training — Not Waived
Limited quantity status does not waive the hazmat training requirement under Subpart H of Part 172.
Any "hazmat employee" — anyone who prepares hazmat for transport, operates a vehicle carrying hazmat, or performs a function regulated under HMR. Includes warehouse staff who apply marks or prepare packages.
Training must be refreshed at least every 3 years. Employers must maintain records of each trained employee's name, completion date, and materials covered — during employment and for 90 days after.
Full Regulatory Reference Map
Every CFR section relevant to limited quantity compliance, in one place.
| What It Covers | CFR Section |
|---|---|
| Which materials qualify for LQ — HMT | § 172.101, Col. 8A |
| Quantity limits — Class 3 (flammable liquids) | § 173.150(b) |
| Quantity limits — Division 4.1/4.3 | § 173.151(b)(d) |
| Quantity limits — Division 5.1/5.2 | § 173.152(b) |
| Quantity limits — Division 6.1 (toxic, non-PIH) | § 173.153(b) |
| Quantity limits — Class 8 (corrosives) | § 173.154(b) |
| Quantity limits — Class 9 / miscellaneous | § 173.155(b) |
| Quantity limits — Class 2 aerosols | § 173.306(a) |
| General LQ exceptions, palletized units, display packs | § 173.156 |
| Square-on-point mark requirements | § 172.315 |
| Shipping paper requirements | § 172.200–172.205 |
| Placard requirements and LQ exemption | § 172.500, Subpart F |
| Emergency response telephone number | § 172.604 |
| Hazmat training requirements | § 172.700, Subpart H |
| Air transport quantity limits | § 173.27(f) |
| Waste LQ exceptions | § 173.12(h) |
| Reverse logistics (LQ returns) | § 173.157 |
| OSHA SDS emergency number requirement | 29 CFR 1910.1200 |
Common Questions About Limited Quantity Hazmat
Still have questions about limited quantity compliance?
Our team can help you confirm eligibility, understand your ERI obligations, and get set up with a DOT-compliant emergency response number if you need one.
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