{"id":"9b86a1d9-e4b0-4675-9161-377d04af5a4b","task":"Determine DOT materials-of-trade exception applicability for a service vehicle carrying chlorine and acid","domain":"chemical-safety","steps":["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.","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.","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.","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.","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."],"gotchas":["Compressed or liquefied chlorine gas is a poison-by-inhalation hazard and is not eligible for the materials-of-trade exception at any quantity — a tech carrying gas chlorine cylinders needs full hazmat shipping compliance, not this exception.","Exceeding either the per-package limit or the vehicle aggregate limit removes the exception entirely for that shipment, triggering full hazmat shipping-paper, marking, and potentially placarding/driver-endorsement requirements.","This is a verification task against 49 CFR 173.6 on its own text — state-level trucking rules can layer additional requirements on top, so check state DOT guidance too before assuming the federal exception alone is sufficient."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/9b86a1d9-e4b0-4675-9161-377d04af5a4b"}