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Environmental Standards



Governmental agencies, private laboratories, and industrial facilities around the world choose Linde as their supplier of environmental gas standards

The Linde Environmental Division is recognized as the worldwide leader in manufacturing calibration gas standards for the environmental monitoring community.


The diligent work of Linde's research and development professionals allow us to routinely provide you with the leading edge environmental calibration gas standards that you require. Whether it is providing a parts-per-trillion (ppt) Mercury Standard, a 100 component @ 100 parts-per-billion (ppb) VOC Standard, a stable parts-per-million (ppm) HCL Standard, or other unique gas standards, analysts know that they can rely on Linde.


Our customers' needs vary from the percent level to the ppt level, and may involve monitoring stack emissions, auto emissions, or ambient air. Regardless of the application, the Linde's drive for innovative processes such as proprietary cylinder passivation, high quality manufacturing techniques, and the latest in analytical testing, provides you with superior calibration gas standards.

Linde's reputation for quality and accuracy is a culmination of decades of innovation, experience, and personnel training. The result of this hard work are the following multi-step manufacturing and analysis processes:

  • Linde Shield™, the unique Linde cylinder cleaning, conditioning, and passivation processes insure our customers that the gas standards they purchase from Linde are uncontaminated and that the cylinder’s contents will be stable for the certified shelf life.

  • All environmental calibration gas standards at Linde are produced utilizing the highest quality raw materials.

  • Only the most sensitive gravimetric filling techniques are employed by Linde. All of the weights, balances, and scales are calibrated directly to NIST (National Institute of Standards and Technology).

  • All calibration gas standards supplied by Linde’s Environmental Division, including air and nitrogen, are analyzed before shipping. Linde's laboratories use the latest state-of-the-art equipment and analytical techniques such as:

    • NDIR (Non-Dispersive Infrared)

    • FTIR (Fourier Transform Infrared)

    • GC (Gas Chromatography)

    • MS (Mass Spectrometer

    • CVAA (Cold Vapor Atomic Absorbance)

      • Chemiluminescence

      • Paramagnetic

      • Electrochemical


VOCs & Criteria Pollutants

Linde is the only company in the world to offer a gaseous mercury standard for monitoring emissions from power plants

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Portable Calibration Gases

Many applications require the use of smaller non-standard cylinders, to assist where gas quantities, size and/or weight can be a consideration. Linde’s line of small portable cylinders offers a solution to larger cylinders wherever small gas quantities are required. There are two product families:

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