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We offer the highest quality, industry-standard ATI oil reagents for use in conjunction with oil aerosol generators. Our reagents are used for in situ leakage testing and production quality control efficiency testing of high-efficiency air filters. ATI oil aerosol reagent products are suitable for government, nuclear, and FDA-regulated testing applications.

We offer PAO-4 (poly-alpha olefin) reagents for use in filter testing applications.

The PAO-4, a four-centistokes PAO (Chemical Abstract System ID 68037-01-4). This reagent offers a U.S. Food & Drug Administration-approved alternative to DOP in FDA-regulated filter leakage testing applications. PAO is approved by the U.S. Army Surgeon General and is used by the United States military as a substitute for DOP in their filter and mask testing processes.

PAO – 4 Oil Aerosol Reagents are available in both 2 Litre and 5 Litre containers. Larger volumes may be available upon request.



Boiling Point >316 oC (600 oF)
Specific Gravity 0.819 @ 15.5 ̊C (60 ̊F)
Vapor Pressure <0.013 kPa (0.1 mm Hg) at 20 ̊C
Vapor Density N/A
Solubility in Water Insoluble
Appearance / Odor Colorless, odorless liquid
Freezing Point N/A
pH at 5% N/A
Flash Point 222 ̊C (432 ̊F)
Method Used Cleveland open cup
Flammable Limits in Air N/A – UEL: N/A | LEL: N/A
Auto-Ignition Temp 343 ̊C (649 ̊F)
Viscosity 18 cSt at 40 ̊C/ 4 cSt at 100 ̊C