Due to the different manufacturing processes for powder-free gloves, they are not 100% powder-free. The definition of "powder" according to American ASTM medical glove standards is anything that does not pass through a 2.7-micrometer glass microfiber filter by using suction filtration.
Both American and European requirements for powder-free exam gloves are for a maximum powder limit of 2 mg per glove. This may include cornstarch, calcium carbonate aggregates, latex particles, synthetic debris, packaging fibres, non-soluble lubricants, dust, etc. Currently, Unigloves manufactures all powder-free exam gloves at a maximum powder limit of 2 mg per glove.