The MSA 10045035 is a 58-liter, four-gas calibration cylinder containing 1.45% methane (CH4) for the combustible/LEL channel, 15% oxygen (O2), 60 ppm carbon monoxide (CO), and 20 ppm hydrogen sulfide (H2S). It is a non-refillable aluminum cylinder pressurized to 500 psig that delivers 58 liters of gas. The mixture is prepared gravimetrically with NIST-traceable weights, and each cylinder ships with an individual Certificate of Analysis and an SDS.

The MSA 10045035 cylinder is used to bump test and calibrate MSA portable multi-gas detectors that monitor the four common confined-space gases: combustible (LEL/methane), oxygen, carbon monoxide, and hydrogen sulfide. Because its 1.45% CH4 / 15% O2 / 60 ppm CO / 20 ppm H2S mixture matches MSA's standard four-gas cal-gas specification, it verifies that each sensor responds correctly and that alarms trigger at the right levels. MSA states it is compatible with MSA gas detectors that require this gas mixture; confirm your specific detector's required cal gas in its manual.

It means the gas concentrations are accurate and documented to a recognized national standard. The MSA 10045035 mixture is prepared gravimetrically (by precise weight) using NIST-traceable weights, and every cylinder is supplied with an individual Certificate of Analysis stating the actual measured concentrations plus the lot number, along with a Safety Data Sheet. This traceability is what lets a calibration record stand up to safety audits and OSHA/compliance documentation.

The MSA 10045035 uses 15% O2 on purpose. Normal air is about 20.9% oxygen, so a reduced 15% level lets the calibration confirm that the detector's oxygen sensor reads accurately in an oxygen-deficient atmosphere and that its low-O2 alarm activates — the exact hazard an O2 sensor exists to catch. Testing only at 20.9% would not prove the sensor can detect a dangerous drop.

Yes. The same MSA 10045035 four-gas mixture works for both a bump test (a quick check that each sensor responds and alarms) and a full span calibration (adjusting the detector's readings to the known gas values). A bump test uses very little gas and is recommended before each day's use; a full calibration uses more and is done on a set interval. Both require applying the gas through a compatible flow regulator.

The MSA 10045035 cylinder requires a compatible flow regulator to deliver gas to the detector — either a fixed-flow regulator matched to your detector's sampling rate or a demand-flow regulator for pumped instruments. The cylinder uses a standard MSA threaded valve. A regulator (and calibration cap/tubing) is an accessory and is not the gas cylinder itself, so make sure you have the correct one for your MSA detector.

Yes — because it contains carbon monoxide and hydrogen sulfide, the MSA 10045035 is a reactive calibration gas, and every cylinder carries a printed expiration date. Reactive mixtures like this one have a shorter usable life than inert-gas cylinders because the reactive components slowly change over time, so you should always check the date on the cylinder and stop using it once expired to keep calibrations accurate.

The MSA 10045035 ships with free shipping from Industrial Safety Products. However, like other compressed-gas cylinders it is not eligible for returns or exchanges, so confirm you are ordering the correct four-gas mixture (1.45% CH4, 15% O2, 60 ppm CO, 20 ppm H2S) for your detector before purchasing. Empty cylinders can go back through MSA's calibration-gas recycling program.

A 58-liter cylinder like the MSA 10045035 delivers 58 liters of gas (aluminum, 500 psig), which is enough for many bump tests and several full calibrations — the exact number depends on your regulator's flow rate and how long each application runs (a bump test uses far less gas than a calibration). Plan replacements around both usage and the printed expiration date, since reactive gas can time-out before it runs out.

For MSA detectors, yes. The MSA 10045035 is formulated to MSA's own four-gas specification, prepared gravimetrically with NIST-traceable weights, and backed by an individual Certificate of Analysis — so you get documented, audit-ready accuracy and a mixture MSA validates for its instruments. Using the manufacturer-matched cal gas removes guesswork about whether an off-spec mixture could bias your sensor calibration, which matters when the detector is the thing protecting a worker's life.