Quat Sanitizer Test Strips

Indigo™ Brand Quaternary Ammonium Sanitizer Test Strips, 100, 400, 1500, 10000ppm. Get fast accurate results in <10 seconds; ideal for organic farming, restaurants, foot baths and more.

Indigo™ QAC (Quat) Sanitizer Test Strips

Quaternary ammonium compounds are ammonium chloride formulations that are potent cationic detergents which disrupt the membranes of bacteria and viruses. Their name derives from the central nitrogen that is bound to four organic groups. Quats bind with microbial cell walls and interfere with their metabolism. They are also shown to be effective against lice eggs and other invertebrates when used in higher concentrations.

  • 10 to 100ppm for residual testing-organic food certification
  • 0 to 400ppm general use in restaurants
  • 0-1500ppm high level disinfection in health facilities
  • 0-10000ppm very high level disinfection-foot baths
  • easy to read color chart
  • strips have white backing for good contrast comparison
  • strips are stiff plastic; good for dipping into tubes
  • Measures accurately from 5-45C (50-110F).
Displaying 1 to 4 (of 4 products)
Restaurant Quat 400 ppm

Restaurant Quat 400 ppm

SKU: 33819-400
$7.50USD or lower Each
High Level Quat 1500 ppm

High Level Quat 1500 ppm

SKU: 33819-1500
$11.75USD or lower Each
Very High Level Quat 10K ppm

Very High Level Quat 10K ppm

SKU: 33819-10K
$15.95USD or lower Each
Residual Quat 10-100 ppm

Residual Quat 10-100 ppm

SKU: 33819-100
$11.95USD or lower Each
More Information

What is a Quat Sanitizer?

Quaternary ammonium compounds are permanently charged cations with four aryl or alkyl side groups; the latter being especially long. They are effective against bacteria, amoebas, fungi, enveloped viruses & invertebrate larvae because they disrupt cell membranes at levels as low at 200ppm from 25-100oC.
Quats have their advantages & disadvantages:
  1. Work best in the pH range of 8-11
  2. Loses potency in hard water (see hard water test strips)
  3. Color charts start to deviate at 45C (110F) & above.

Quaternary Ammonium Compounds

Quaternary ammonium chloride solutions come in many varieties. Ours are calibrated for Oasis 146 but can be considered multi quat sanitizer test strips since results for other formulations such as the ones below will still be accurate. Treat all Quat solutions as 100% and use our Dilution Equation Calculator to dilute accordingly.

Common Quats:

  • benzethonium chloride
  • methylbenzethonium chloride
  • cetalkonium chloride
  • cetylpyridinium chloride
  • cetrimonium
  • cetrimide
  • tetraethylammonium bromide
  • didecyldimethylammonium chloride
  • domiphen bromide

Note: All Indigo™ quat test strips are Made in USA & and are Q/A'd against NIST standards.

Temperature and QAC strips reading relationship

Temperature vs ppm results for Hyamine 1622 (Fluka) warmed up from 35 to 60oC (95-140F).

T (oC) QAC strips readings at: 0; 50; 100; 200; 400 ppm
35     Readings ok for 0-400ppm
40     Readings ok for 0-400ppm
45     0, 50, 100 ppm readings ok; 200 & 400 ppm read~ 1/2 color square higher
50     50, 100 ppm read~ 1/2 color square higher; 200, 400 ppm read 1 color square higher
55     Readings 1 color square higher across whole range
60     Readings 1 color square higher across whole range
Q: I need to create a Standard Operating Procedure on how to use and interpret the use of the High level QAC test strips. I found the one page document on the product description and operating principles I wanted to know if you had any training videos or additional documents on describing what is the desirable ppm range the foot bath should be in, on understanding how to read the strips and what to do if the strips are not within the desirable range. My operator is VERY new and I need to explain every detail.

A: 1. If you don't have guidelines set by a local health authority or an industry standard, then go with the highest level, 1500ppm. However, some have even gone with higher levels and use the 10,000ppm strip.

2. The instructions on the strip pack are straightforward. Dip the strip into the solution & IMMEDIATELY compare to the color chart. If you wait 30 seconds, as required by other brands, you will get a false high reading.

3. Do not use hot water. Water warmer than 40C/105F may give false high readings.

4. The simple answer for not in the desirable range is to add more Quat concentrate if the reading is low. Add more water if the reading is high. Then retest. Don't worry about being exact, you can be +/- 10% without major consequences.

If you run into repeated problems with getting the right concentration, try our Dilution Equation Calculator.

Follow the directions on the label. All Indigo™ quat strips are "quick response". In other words, dip the strip & compare to the color chart immediately. If you wait, the color will develop further & give a false high reading.