By and large, the main performance criteria of a mask comprises:
1. air transmission rate (or breathability)
2. water vapour transmission rate (or water vapour absorbency)
3. filtration efficiency
4. particle count

In certain applications such as the assembling of ultra sensitive electronic devices, there are also stringent requirements to limit/prohibit the presence of:
5. ionic contaminants
6. non-volatile residuals
7. amide, and silicone oil
8. outgases

In some other applications,
9. activated charcoal filter
10. anti-bacterial sheet or
11. eye-protector film may be necessary.

As may be expected, a mask which can meet the most stringent of the widest range of criteria is generally very expensive and therefore not cost-effective in most instances.

The key to getting the best value for money, therefore, is to choose a mask which best meets the critical requirements of a particular application without over specifying the other properties. In other words the mask should ideally be customised in order to be most cost effective.

Whilst the ideal is not attainable and what is attainable is never ideal, the range of choices in materials, designs, constructions and even colours under our label "TEClean" is, in most probability, the widest from any single source around the globe. In short, next to ideal. The choice is yours.