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Differential Pressure

Differential Pressure

The Differential Pressure test determines the air exchange differential of porous materials such as surgical face masks and other filtration devices. This test was designed after the Military Specification 36954C, complies with EN 14683 and is commonly requested for samples submitted for Bacterial Filtration Efficiency (BFE) testing.

The test is required by ASTM F2100 and EN 14683, and is used for FDA 510(k) submissions for surgical masks. Nelson Laboratories’ staff is experienced at performing this test and can provide a one-stop shop for all ASTM F2100 and EN 14683 testing needs.

Applicable Standards

  • ASTM F2100
  • EN 14683
  • Mil-M-36954C

Test Options

Ask an expert for a specific consultation on your product. If you are ready to submit your samples for testing, click here to fill out the Sample Submission Form.

Code Test Request Quote
DPT110 Differential Pressure only Add
DPT110 - Differential Pressure only

Sample Specifications

DPT110: Minimum 5 recommended; each sample must be 4 x 4 inches (10 x 10 cm) flat sheet or full face mask

Study Outline

A Differential Pressure test is important in evaluating the breathability characteristics of surgical face masks. For other filtration devices, this method helps to evaluate air flow resistance, which may be an important property of the product.

This test determines the breathability by measuring the differential air pressure on either side of the test material using a manometer, at a constant flow rate of 8 liters per minute (LPM). Other flow rates can be evaluated upon request. The test materials are conditioned for a minimum of 4 hours at 21 ± 5°C and 85 ± 5 % relative humidity prior to testing.

The differential pressure values are reported in mm water/cm2 (ASTM F2100) and Pa/cm2 (EN 14683).

The differential pressure test is commonly performed with the BFE Test.
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