Blend tolerances are affected by a number of factors including:

Blending Method

Although most manufacturers utilize a combination of partial pressure and gravimetric filling, Liquid Technology uses solely gravimetric blending to manufacture all calibration gas standards. This allows us to offer tighter blend tolerances on all gas mixtures including EPA, Primary, Certified and most Disposable Gas Standards.

Mixture Component Interaction

Through years of research, our laboratory continues to lead the way in identifying and eliminating reactivity potential between minor components to provide you with the most stable mixtures on the market. Ongoing internal studies continue to lead to extended, defined shelf life(s) on a broad array of liquid and gas mixtures

Cylinder Treatment Process

Cylinder Surface interactions can present challenges with respect to certain reactive components. Liquid Technology continues to expand our line of proprietary methods for cylinder treatment to eliminate reactivity potential between low level components and cylinder surfaces.

BLEND TYPE COMPONENT RANGE PREP TOLERANCE
ANALYTICAL TOLERANCE
Primary Standard
>100 ppm
+/- 1.0%
+/- 1.0%
Primary Standard
<100 ppm
+/- 2.0%
+/- 1.0%
Certified Standard
>100 ppm
+/- 2.0%
+/- 1.0%
Certified Standard
<100 ppm
+/- 5.0%
+/- 2.0%