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NMFC 162930 - Pumice & Lava Rocks | Class 50–400

Article ID
162930
NMFC 162930 covers pumice and lava rocks
Freight Group
UNGROUPED ARTICLES
Ungrouped item with density-driven classes
Class Range
50-400 13 classifications
Classes 50–400 based on measured pounds-per-cubic-foot
Hazardous
No
Non-hazardous, easy to ship and stack

Classification Details

NMFC Description Class
162930.00 Pumice, including Pumice Stone or Lava Rocks, see Note, item 162931, in bags or boxes, subject to Item 170 and having a density in pounds per cubic foot of:
162930.01 Less than 1 400
162930.02 1 but less than 2 300
162930.03 2 but less than 4 250
162930.04 4 but less than 6 175
162930.05 6 but less than 8 125
162930.06 8 but less than 10 100
162930.07 10 but less than 12 92.5
162930.08 12 but less than 15 85
162930.09 15 but less than 22.5 70
162930.10 22.5 but less than 30 65
162930.11 30 but less than 35 60
162930.12 35 but less than 50 55
162930.13 50 or greater 50

Notes

Note 162931: NOTE-Also applies on Pumice Stone Blocks or Forms.

How to Determine Your Class

To find the correct freight class for your shipment:

  1. Confirm material and packaging: pumice, pumice stone, or lava rocks in sealed bags or sturdy boxes, then palletize and shrink-wrap to contain grit.
  2. Calculate density per Item 170: weigh the handling unit, measure L×W×H in inches, convert to cubic feet, and divide weight by cube to find the class break.
  3. Keep product dry and contained. Pumice is porous; moisture shifts weight and can prompt reweigh/reclass. Use liners in bags or a bag-in-box approach to prevent dust escape.
  4. Improve stackability: use slip sheets and corner boards for bagged rock, label ‘This Side Up,’ and strap pallets so loose fill doesn’t slump during transit.

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

Business Value

  • Lower freight costs by boosting density: right-size boxes or compact bag fills to reach a better pcf and qualify for a lower NMFC class.
  • Non-hazardous status broadens carrier coverage and simplifies jobsite or residential deliveries common in landscaping and horticulture.
  • Cleaner deliveries and fewer claims: abrasion-resistant packaging keeps particles contained, reducing damage, cleanup time, and chargebacks.
  • Accurate density data prevents inspections and reclass fees, enabling faster quoting, predictable invoices, and tighter logistics budgeting.