First, there is absolutely no oil in the air of an oil free compressor while in a “technical” oil free compressor, oil is actually injected in the air and removed afterwards using a filtration process. This procedure involves several parts such as an oil separator, coalescent filters and activated carbon filter to remove vapors. Now, the problem is that during the filtration process failures can happen. A separator can break or a filter can be saturated quicker than expected contaminating the process and the end product.
Besides that, the lifetime of the “technical” oil free machines can be short at high temperatures.
Another disadvantage of a “technical” oil free machine is its high maintenance. The machine has to undergo regular interventions to change the filters and to treat the condensate, leading to higher energy costs.
When using true oil free air compressors, you do not have any of these concerns. Also, you have your safety and environmental problems covered.