Analytical Chart

Blend and Analytical Component Analysis guidelines in accordance to Grade of Mixture.
ALL BLENDS ARE PREPARED IN ACCORDANCE TO NIST.

Reference Section 2

The customer must request the NIST SRM OR NIST WEIGHT. All values which meet NIST SRM requirements are supplied with the Analysis Label, located on the cylinder


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Process Minor
Component
Range		 Specification of Mixture
Primary Gold Star Certified Unanalyzed
Blend 10 ppb to 999 ppb + / - 25% of each minor component + / - 15% of each minor component N/A Cannot be specified
due to lack of analysis. Typically 5% to 30%.
0.1 ppm - 9.9 ppm + / - 10% of each minor component + / - 5% of each minor component + / - 20% of each minor component
10 ppm - 999 ppm + / - 5% of each minor component + / - 2% of each minor component + / - 10% of each minor component
1.0% - 1.9% + / - 2% of each minor component + / - 2% of each minor component + / - 5% of each minor component
2.0% - 49% + / - 1% of each minor component + / - 0% of each minor component + / - 2% of each minor component
Analytical 10 ppb to 999 ppb + / - 10% of each minor component + / - 5% of each minor component N/A Mixtures are not analyzed.
0.1 ppm - 9.9 ppm + / - 2% of each minor component + / - 2% of each minor component + / - 2% of each minor component
10 ppm - 999 ppm + / - 1% of each minor component + / - 1% of each minor component + / - 2% of each minor component
1.0% - 1.9% + / - 1% of each minor component + / - 1% of each minor component + / - 2% of each minor component
2.0% - 49% + / - 1% of each minor component + / - 1% of each minor component + / - 2% of each minor component

*CERTIFIED - Means a Standard which has been adopted by NIST and is reflected to blend and perform analysis within accepted industry standards.

Example: If you request a product contain 1% Methane in Air and request a Certified NIST Standard, the chart reflects that the Blend Tolerance will be 5% +/-, and the Analytical Tolerance will be 2% +/-.

*PRIMARY - Means a Standard which is much more restrictive in this chart.

*Gold Star - This is a Standard adopted by our company which is much more rigid than either of the NIST Standards, but is NIST Traceable.

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Last Updated: January 4, 2001