Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Evaluation of Wildland Fire Chemicals
Standard Test Procedures (revised 5/4/06)

STP 8.1—Surface Tension

Summary:

The surface tension of a test solution is one indicator of the ability of the solution to penetrate wildland fuels, such as charred wood and scorched duff, as well as weathered building materials.

A sample of the product that was submitted to the Forest Service for qualification testing is sent to an approved testing lab. Results are sent back to the Forest Service.

The Project Leader for Fire Chemicals reviews the results and prepares a letter to the supplier showing the performance of the submitted product.

Method:

All testing shall be performed in accordance with American Society of Testing and Materials Standard Test Method for Surface and Interfacial Tension of Solutions of Surface-Active Agents.

Equipment:

  • Electronic density meter
  • 5-mL syringe
  • Calibration standard (usually room temperature distilled water)

References:

American Society for Testing and Materials. Standard Test Method for Surface and Interfacial Tension of Solutions of Surface-Active Agents; D1331-89(2001).


Printer-friendly (PDF File, 56 kb)