Pursuant to the Montreal Protocol on Substances that Deplete the Ozone Layer, worldwide countries continue progress toward effectively phasing out the use of all Chlorofluorocarbons. In connection with these efforts, the U.S. EPA has published new Method 1664 to replace existing Oil & Grease Method 413.1 which uses Freon-113, a Class I CFC, as the extraction solvent. New Method 1664 employs n-Hexane as the extraction solvent instead of Freon® and most importantly, permits use of solid phase extraction techniques.

When compared to liquid/liquid extraction, CPI solid phase extraction disks for Oil & Grease are much easier to use, cut extraction time by at least two-thirds, require less than half the solvent, do not form emulsions during sample preparation, and provide equivalent or superior extraction performance: 

• Speed Extraction Time – Faster flow rates on most samples
• Save Money – Less expensive than Liquid/Liquid extraction
• Sediment Trapping Design – Patented design traps sediment while ridges allow sample to pass
• Eliminate Emulsions and Freon® – Eliminate shaking, emulsion formation, and reduce solvent usage

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Oil & Grease SPE Disks & Supplies
Description	CPI P/N	Replaces JT Baker® P/N (Varian®  P/N)
Oil & Grease SPE Disks, 47mm,  20/pk	4350-13	7522-06/8060-06 (1214-5017)
Oil & Grease SPE Disks, 90mm, 10/pk	4350-139	7522-09 (1214-5016)
Teflon® .45µ Syringe Filter, 25mm, 100/pk	4350-131	n/a
Drying & Filtering Cartridge, Nominal 3g, 50/pk	4350-135	n/a
The above Drying & Filtering Cartridge contains both Sodium Sulfate and a .45µ Teflon filter, to perform drying and filtering simultaneously.
FastFlo™ Prefilter, for 47mm glass, 20pk	4350-010089	n/a
FastFlo™ Prefilter, for 90mm glass, 10pk	4350-010090	n/a
Glass Filter Beads, 1Kg	4350-15	7467-01 (1214-6005)
Oil & Grease Standard, 100mL	4401-1664-1	n/a
The above standard contains Hexadecane and Stearic Acid at 4mg/mL each in Acetone.
Free Training Material for EPA 1664
Description	CPI P/N
Application Note, Method 1664	4350-050002
“Optimization of glass fiber solid phase extraction disks for the determination of n-hexane extractable materials”
This application note covers use of SPE techniques under the requirements of proposed Method 1664. It includes numerous tips for performing the extraction and optimizing recoveries and precision. In addition, this application note compares the performance of five brands of Oil and Grease SPE disks on the market and highlights their strengths and drawbacks. It is a helpful resource for saving method development time in the lab.
Samples of CPI Oil & Grease SPE disks (47mm)	4350-13S
Comes complete with step-by-step instructions for performing the extraction to meet Method 1664 performance criteria.