Quat Sanitizer Test Strips

Choose from 4 different Indigo® quaternary ammonium chloride test strips for disinfection & sanitizing needs in restaurants, hospitals, organic farming & more. All come with 100 test strips/vial, a guaranteed 3 year minimum shelf life. Full documentation is available including a Stability Statement, Certificate of Analysis & SDS. Optional next day delivery in any quantity of most items. Buy Indigo® test strips, the brand you can trust for accuracy & technical support. Call us on our toll free line for immediate assistance or e-mail us with your questions. 1 hour response is typical during business hours, M-F, slightly longer on weekends.

Indigo® QAC (Quat) Test Strips

Quaternary ammonium compounds are ammonium chloride formulations that are potent cationic detergents which disrupt the membranes of bacteria and lipophilic viruses especially on hard, non-porous surfaces.

Their name derives from the central nitrogen that is bound to four organic groups. Quats attach to 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.
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 are a Quats?

Quaternary ammonium compounds are a chemically diverse group of permanently charged cations with four aryl or alkyl side groups. See benzalkonium chloride as an example.

Quats are effective against bacteria, amoebas, fungi, enveloped viruses & invertebrate larvae because they disrupt cell membranes at levels as low at 200ppm. They are not sporocidal or effective against hydrophilic viruses.

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

Indigo® Quat/QAC Test Strip Technical Specifications

  • 10 to 100ppm: ≤10-20-30-50-100ppm; read results in 10 seconds
  • 0 to 400ppm: 0-100-200-300-400ppm; read results in 10 seconds
  • 0-1500ppm: 0-200-400-750-1000ppm; read results in 5 seconds
  • 0-10000ppm; : 0-1000-2500-5000-10000ppm; read results in 5 seconds

Quaternary ammonium sanitizers are important for hard surface disinfection where food is prepared. Here are some pros & cons.
Pros Cons
Nontoxic, odorless, colorless, noncorrosive, nonirritating Slower at killing some microorganisms
Relatively stable in the presence of organic matter Not compatible with some detergents
Active over a wide pH range but best in the range of pH 8-11 Not compatible with hard water
  Color charts start to deviate at 45C (110F) & above

How to Dilute Quaternary Ammonium Compounds

Most Quat disinfectants are formulated with more than one quaternary ammonium compound & may be designated as "multi-quats". Indigo® test strips are calibrated for Oasis 146 consisting of:
To dilute any multi-quat accurately, add up the percentages of the quats used in the formulation. For Oasis 146, they add up to 7.5%. Use this percentage in our Dilution Equation Calculator to prepare a 1L/1US quart spray bottle as in this example:

Step 1: enter 7.5%.
Step 2: enter 1500ppm as the desired final concentration
Step 3: enter 1000mL (=1L, =~1 US quart) for the amount of water
Step 4: press Calculate to see that 20mL (~1 oz) of quat added to the 1L of water (0.98L to be really precise) gives you a 1500ppm solution.

If you're good with math, you can check these results. First. converting 7.5% to 75000ppm. Then 1500ppm divided by 75000ppm equals 1/50 which is the same ratio as 20mL/1000mL.

Not clear on percent vs ppm? See our blog: Diluting Chlorine, Peroxide or Quat Sanitizers is Easy.