Content Handbook O

Outline of method

Suitable pieces of the net are subjected to successive washing-rinsing-heating cycles and the active ingredient content is determined in the washed samples after several washings (Note 1). The wash resistance index is determined by the decrease of the active ingredient content after several cycles using the appropriate analytical method.

Scope

This method is intended for determination of the wash resistance index of long-lasting insecticidal net (LN). It is suitable for coated and incorporated types of LN. The wash resistance index is defined as the proportion of the content of the active ingredient on/in the LN after washing compared to that before washing using the procedure in this method.