On February 15, 2021, the American Society for Testing and Materials (ASTM) released the new mask standard ASTM F 3502, which is the first standard for protective masks used by ordinary consumers. This standard mask is suitable for general public and workers to wear. The mask covers at least the nose and mouth of the wearer. It aims to control the source by reducing the amount of sprayed droplets, and at the same time filter the particles to reduce the wearer’s inhalation. protect. ASTM F 3502 specifies general production standards, particle filtration efficiency levels and other performance (test) indicators, labels, user instructions, reports and classifications, compliance assessment requirements, cleaning instructions, and recommended use periods for single and reusable masks.

1. General structure

(1) At least cover the user's face and mouth;

(2) Fit tightly to minimize leakage;

(3) Quantitative leak assessment can be carried out through design analysis or using ASTM F 3407;

(4) It is forbidden to include vents, valves or other functions that allow airflow to bypass the filter element of the barrier mask during exhalation;

(5) There are no sharp edges, sharp places or burrs;

(6) The retention system is used to cover obstacles on the user's nose and mouth to achieve the expected use and activity time;

(7) Dimensions.

2. Performance indicators

New Standard for Protective Masks-ASTM F 3502-Microtest Testing

3. Conformity assessment

(1) Should meet or exceed the requirements of Model A in the guide ASTM F 3050;

(2) Sub-micron particle filtration efficiency (PFE) and air flow (respiration) resistance tests must be carried out by a laboratory accredited by ISO 17025 and within its accreditation range.

4. Use period

Reusable masks must state the "lifetime", the maximum number of uses and cleaning/cleaning cycles that can be carried out, and still maintain their performance level attributes.