PurityPlus® manufacturers are a group of
independently-owned specialty gas producers in North America that are working
through the Independent Welding Distributors Cooperative. Our regularly-performed
Standard Operating and Quality Assurance Procedures are an essential aspect of
the PurityPlus® program.
AsteRisk, LLC, a consulting organization in the gas industry, is the
company that originally defined, evaluated, and carried out our extensive
SOP/QA program. AsteRisk is further endorsed by PurityPlus® for its
third-party auditing, in addition to its operations and safety consulting (www.asteriskllc.com/). The fundamental aspects of the program are a
set of levels or tiers that defines each participant’s performance capacity. These
tiers lay out the analytical abilities and processes that are necessary to
provide gases of stated purities by adhering to generally approved levels of
maximum impurity and analytical tolerances. Additionally, calibration and
verification is implemented through standards that are NIST-traceable and
confirmed by annual testing.
We use two definitions when attempting to define
traceability. The first is the NIST definition, which says that traceability is
described as an uninterrupted record of documentation (“documentation
traceability”) or an uninterrupted chain of measurements and associated
uncertainties (“metrological traceability”). When applied here, the word
“traceability” always refers to “metrological traceability.” The ISO 17025
definition of traceability is “a property of a measurement result whereby the
result can be related to a reference through a documented unbroken chain of
calibrations, each contributing to the measurement uncertainty.” The specialty
gas specification at PurityPlus® can be traced back to NIST’s
Standard Reference Materials where similar gas standards exist. If certain SRM’s are nonexistent, equally
comparable standards are used, directly sourced from a national government
agency outside of the United States, or by having a gas standard reviewed and
certified by NIST or another designated entity.
Single-stage regulators reduce pressure in merely one step
to generate pressure within a specified range. Regulators created accordingly
will display an insignificant variation in delivery pressure as the cylinder
pressure decreases when in use. Because of this, single-stage regulators are
most suitable for applications in which a constant outlet pressure is not
vital, where an operator can monitor and readjust pressure, or where an inlet
pressure is stable.
Dual-stage regulators perform the same function as single-stage
regulators; however, delivery pressure holds constant as cylinder pressure
declines. Heightened accuracy in pressure control is maintained because the
reduction of pressure is achieved in two steps. Dual-staged regulators are
recommended for applications that require a constant outlet pressure for the
life of a gas cylinder.
PurityPlus® Specialty Gases offers several grades of calibration gas standards – Custom Mixtures, Certified Standards, and Primary Standards to meet the level of accuracy for your laboratory or production process. All PurityPlus® Specialty Gases are custom-mixed and analyzed, and then properly labeled in one of our independently audited laboratory facilities. Each PurityPlus® Production facility conforms to a strict set of quality-assurance measures and standard operating procedures. Each of these labs have been thoroughly inspected, certified and documented to be compliant with FDA, DOT, OSHA, and EPA requirements - among others - by AsteRisk, a globally known, reputable, independent certification company headquartered in the U.S.
Exposure to hazardous chemicals results in steep fines, penalties, and a compromised workforce. PurityPlus® Specialty Gases meets regulations and ensures compliance with all primary and certified standards.