Compared to compressed air, vacuum is increasingly used in industries: vacuum packaging for food/pharma, vacuum assembly of electronic parts, vacuum handling for LCDs/auto glass, vacuum coating, heat treatment, etc.

What is vacuum? How defined? 
Basics: 
1atm = 760mmHg = 1.01325×10^5Pa = 1.01325bar. 
Unit conversions below.

Confused? Simply: at sea level, gauges read 0, but absolute pressure is 1atm above you. (Less confusing, but heavier?)

Vacuum is opposite: removing air. Theoretically to zero (gauge: -1bar), but absolute vacuum is unattainable. The unattained point is absolute vacuum level.

AIRpipe's ring seal provides larger contact area than standard O-rings, enhancing lifespan and durability. Its vacuum sealing matches pressure performance, achieving ~1mbar absolute vacuum (1mbar=100Pa=99.9%). (Actual: 0.79mbar/99.92%) This exceeds most application needs.

Vs compressed air pipes, vacuum systems demand superior sealing and cleanliness. Minor leaks degrade vacuum, and internal rust/oxidation burdens pumps. Install quality piping alongside good pumps.

AIRpipe: Not just quality compressed air piping, but also vacuum.