Determine DOT materials-of-trade exception applicability for a service vehicle carrying chlorine and acid

Steps

1. Identify the DOT hazard class and packing group of each chemical carried (e.g., cal-hypo is typically a Division 5.1 oxidizer; muriatic acid is typically Class 8 corrosive) from the product's SDS/shipping description.
2. Confirm none of the materials fall into a category excluded from the materials-of-trade (MOT) exception under 49 CFR 173.6 — this exception does not apply to poison-inhalation-hazard materials, self-reactive materials, or hazardous waste.
3. Apply the per-package limits: for Packing Group II or III materials, no more than 30 kg (66 lb) or 30 L (8 gal) per package; for Packing Group I materials, no more than 0.5 kg (1 lb) or 0.5 L (1 pint) per package.
4. Apply the vehicle aggregate limit: total materials of trade generally may not exceed 200 kg (440 lb) gross weight, except where a different provision under the section applies.
5. Confirm the products are carried for the technician's own direct business use (not for resale/wholesale delivery), since that use condition is part of what qualifies a shipment as a material of trade.