Marsh Cone Set for Civil & Construction, ESMC, Bangladesh

Cone Set for Civil and Construction, China

Marsh Cone Set

Marsh funnel set

The Marsh Funnel was developed to provide a field measurement of the apparent viscosity of clay-thickened drilling mud.

Provided that a conversion table has been developed, a modified Marsh Funnel can be used to provide a measure of apparent viscosities for gum-thickened and polymer thickened products used in wildland fire operations.

Without a conversion table, the flow-through times can be used to determine batch to batch consistency of a single product, and in limited circumstances to compare similar products. The directions for use of a Marsh Funnel are given below. The procedures for modifying the Marsh Funnel for use in determining the viscosity of long-term retardants (Forest Service modification) and the consistency of water enhancers (California Department of Forestry and Fire Protection,


The orifice of the original Marsh funnel tip is too small for determining the viscosity of enhanced water mixtures. The California Department of Forestry and Fire Protection (CDF) modified a standard Marsh funnel for use with these higher viscosity materials. The instructions for making the modifications are described below and shown in the figures.


  • Cut 3 3/4 inches off the tip of the funnel with a saw.
  • Glue a 3/4-inch threaded PVC bushing into the opening
  • Obtain several 3/4-inch threaded PVC plugs (sizes 3/8-inch, 5/16-inch, 1/4 inch, and 3/16 inch) that can be threaded into the bushing to change the inside diameter of the tip.
  • Label the plugs with the diameter of the hole.

Images are reference only. Actual product may be different.

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