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NWSP 350.1 Tampons Absorbency




NWSP 350.1


Menstrual Tampons Absorbency – Syngina Method


The NWSP 350.1 Tampons Absorbency test method specifies a procedure for the in-vitro measurement of absorbency of menstrual tampons by the Syngina method. It is a quality control test that is used in production sites for determining conformance to internal manufacturing specifications and for ensuring compliance to the EDANA Code of Practice for Tampon Labeling that has been agreed upon with the European Commission. It is important to note that this laboratory test is not intended to be used for predicting absorbency in-vivo.

The protocol has been used by the tampon industry globally for more than 30 years and it is favored by some regulatory authorities. It is applicable for products with an absorbency of up to 25 grams. The coefficient of repeatability has been estimated for an absorbency of around 10.5 grams to be less than 5%.

This test method provides the values in both SI units and inch-pound units. Inch-pound units are the customary units used in the United States and these values will be in parentheses in the body of this method. The International System of Units (SI units) are the customary metric units used in most of the rest of the world.

SI values are regarded as the official standard system of measurement for this standard test method.


The principle is to simulate the vaginal environment in the laboratory by applying standard pressure to a tampon inside a flexible membrane (a certain type of condom) and then introducing defined amounts of fluid until the tampon leaks. The tampon weight is taken before and after the test to calculate the weight of fluid absorbed.


Please note:
SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.