Compound Usage Explained

Within normal usage on regular discs we’d expect to see around half of one bottle still remaining after the chips time has expired. 

This is not just due to Blu-Ray mode using more but how the machine works in general.

For example, if an operator used only 30 seconds cycles on regular repair, within the 500-minute consumables pack this would equate to 1000 starts. The machine uses more compound at the start of each cycle to prime the lines and wet the disc slightly before running. This means it would use more than the other end of the timing spectrum like a 4-minute repair which is only 125 starts. 

So, along with pre-priming that the operator may do during the general use of the machine and the way the machine uses the compound on different cycles such as Blu-ray, means we would always expect there to be some compound left. If the manufacturers were to put just enough for the average user we’d have some customers running out. 

BR discs always come out with compound left on the disc due to the cycles pump timings. In a Regular 2 minute cycle the compound pump stops with 30 seconds to go and the water stops with 10 seconds to go. This helps the disc get a clean finish. In BR mode the compound stops with 10 seconds to go and the water with around 5 seconds meaning you always get a wet BR disc. If the pumps stopped earlier then it's not really do anything to the hard coat of a BR disc.