Parts Per Million (PPM):

Parts per million is a measure of concentrations that is used where low levels of concentration are significant. The PPM value is equivalent to the absolute fractional amount multiplied by one million.

Example of Parts Per Million:

Weight of significant concentration such as Copper lead frame = 0.000675 grams

Total Weight of the device is 0.1265 grams

To calculate ppm 0.000675 / 0.1265 x 1,000,000 = 5336 ppm

As a percentage 0.1% is 1000 ppm or 1% is 10,000 ppm

Percentage of Weight:

Weight of material = 0.000675 grams

Total Weight of device = 0.1265 grams

Percentage calculation is 0.000675 / 0.1265 = x 100 = 0.5336%

Rev. 5/3/05