NMFC 91925 - Gypsum & Plaster Products | Class 50–400

Article ID

91925

Covers gypsum, plaster, stucco, blocks, and additives

Freight Group

UNGROUPED ARTICLES

Ungrouped density-rated gypsum and plaster items

Class Range

50-400 13 classifications

Classes scale with density, 50 through 400

Hazardous

Non-hazmat; keep dry to prevent clumping

Classification Details

NMFC	Description	Class
91925.00	Gypsum or Gypsum Products, viz.: Gypsum, ground, powdered or pulverized, other than land plaster, not calcined, in cloth or paper bags or in boxes or drums; Gypsum Blocks, Planks, Slabs or Tile, reinforced or not reinforced with metal, with or without metal ends or sides, in packages; Gypsum Concrete, in cloth or paper bags or in bulk in boxes, drums or pails; Gypsum Filler, in cloth or paper bags or in bulk in boxes, drums or pails; Gypsum Rock or Anhydrite Rock, crude, not further processed than crushed, screened or dried, not calcined, in cloth or paper bags or in bulk in boxes or drums; Plaster, calcined; patching, stucco or wall; Keene's Cement or Plaster of Paris, in cloth or paper bags, or in boxes or drums; Plaster, land, in cloth or paper bags or in boxes or drums; Retarder or Accelerator, plaster or stucco, in cloth or paper bags or in drums; Subject to Item 170 and having a density in pounds per cubic foot of: Show more
91925.01	Less than 1	400
91925.02	1 but less than 2	300
91925.03	2 but less than 4	250
91925.04	4 but less than 6	175
91925.05	6 but less than 8	125
91925.06	8 but less than 10	100
91925.07	10 but less than 12	92.5
91925.08	12 but less than 15	85
91925.09	15 but less than 22.5	70
91925.10	22.5 but less than 30	65
91925.11	30 but less than 35	60
91925.12	35 but less than 50	55
91925.13	50 or greater	50

To find the correct freight class for your shipment:

Identify the product form (powdered gypsum, gypsum rock, plaster/Stucco, Keene’s cement, accelerators/retarders, or blocks/tiles) and its final shipping package, then weigh and measure the full pallet or crate to calculate density (lb/cu ft) for NMFC Item 170.
Run a quick density check: a 48×40×36 in pallet of bagged plaster weighing 2,000 lb cubes at 40 cu ft, or 50 pcf—often qualifying for a lower class and better LTL rate.
For blocks/planks/slabs/tile, band to a pallet with corner and edge protectors, add a rigid top cap (OSB), and keep strapping off metal-reinforced edges; mark as Do Not Stack if crush-risk exists.
Control moisture and dust: use sift‑proof bag closures, poly liners in boxes or drums, full stretch-wrap with a top sheet, and keep shipments off damp floors or exposure during transfer.

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

Accurate density entry under NMFC 91925 prevents reclass/rebill disputes, keeping invoices clean and pickups on schedule.
Optimized packing—tighter bag patterns, right-size boxes, or drums that reduce void space—boosts density, lowering freight class and cutting LTL rates.
Non-hazmat mineral products streamline carrier acceptance, avoid hazmat fees, and simplify paperwork for faster tendering.
Edge protection and moisture barriers reduce breakage and clumping, slashing claims and waste for contractors and plants receiving gypsum goods.

Weight (lbs)

Dimensions (inches)