One in a series addressing the testing and sampling of varnishes, paints and related products. Defining a method for determining the (VOC) volatile organic compound content of varnishes, paints and raw materials. This part may be used where the content of the VOC is expected to be greater than 0.1% by mass and less than about 15% by mass. When the content of the VOC is greater than about 15% by mass, the less complicated method given in ISO 11890-1 should be used. It is asssumed that the volatile matter is either organic or water. However, other volatile organic compounds may be present and may need to be quantified b another suitable method and allowed for in the calculations.