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ISO 11948-1 Absorption capacity




ISO 11948-1


Urine-absorbing aids — Part 1: Whole-product testing


The method measures the maximum absorption capacity of the absorbing material in the entire urine-absorbing aid. The method is useful for comparing the performance of products whose absorbing cores are uniform in composition and absorbing properties, but it overestimates the amount of urine these products hold in actual use. The method has not been validated for predicting performance of urine-absorbing aids whose absorbent cores are designed to be non-uniform in composition and absorbing properties.

Urine-absorbing aid user performance is affected by many other factors in addition to absorption capacity, such as: the pressure on the product; the posture of the user (e.g. sitting, standing, moving, lying down); the flowrate at which the user loses urine; and how well the product is put on. From user trials, urine-absorbing aid performance is also known to be affected by composition and design features such as shaping, profiling, composition of the absorbent core, elastication and the kind of fixation system used to keep the product close to the body. This method does not differentiate these product features.


ISO 11948-1 Absorption capacity specifies a method for determining the absorption capacity of the absorbent core of body-worn urine-absorbing aids.


The urine-absorbing aid is weighed dry, soaked in test liquid, drained, and weighed wet.  Subtraction of the dry mass from the wet mass gives the absorption capacity.

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