NMFC 143500 - Well Sealing Fibers | Class N/A

Note 143501: NOTE-Applies on material used to seal the walls of the bore hole to prevent the loss of the drilling fluid from the hole into the formation.

To find the correct freight class for your shipment:

1. Confirm composition before quoting: fiber-only versus fiber-plus-additives, then reference NMFC 143500 and review Note item 143501 for any exceptions or subitems.
2. Spell out the commodity on the BOL: “Sealing material, oil or gas well drilling, fibrous, NMFC 143500, non-hazardous,” and list packaging (e.g., 50 lb poly-lined bags on pallet or 1,000 kg supersack).
3. Protect against moisture and fiber loss: use lined bags or supersacks with inner liners, top-sheet and stretch wrap, and corner boards so pallets can be safely stacked.
4. Plan site delivery needs common to rig yards: request forklift-capable delivery for supersacks, avoid overhang on pallets, and add dust-control labeling if fibers are prone to nuisance dust.

Note: All classifications are subject to Item 170. Verify with official NMFC publications for the most current requirements.

• Accurate NMFC 143500 usage reduces reclass and reweigh disputes, stabilizing LTL quotes and preventing surprise carrier fees.
• Non-hazardous status broadens carrier options and eliminates hazmat surcharges, improving lane coverage to remote well and pipe yards.
• Clear packaging descriptors (bags, boxes, supersacks) streamline dock handling and cut detention, especially on appointment-based oilfield deliveries.
• Moisture-resistant packaging and secure unitization lower claim risk for clumping, leakage, or fiber escape, preserving margins on repeat shipments.