Ammonia Leak Detection Strips

SKU: 33810-Phe

$3.95USD or lower Each

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[4.8]   3 Reviews    | Write a Review

Buy Indigo® phenolphthalein test papers for fast, inexpensive ammonia gas leak detection. Ammonia changes phenolphthalein paper from white to pink at pH 8.3 & higher. Only $3.95 for 100 strips; save even more with quantity discounts.

Find ammonia gas leaks by wetting one end of the test paper with water and then holding it near the suspected leak. If the color change is immediate, get a protective mask with an air supply.

If you need a supersensitive detector for gloveboxes, click on ammonia leak detector cloth. Or, if you need a semiquantitative measurement for use in bioreactors or waste management, click on 0-100ppm ammonia test strips.


How Does Phenolphthalein Indicator Work?

Phenolphthalein is itself a weak acid and colorless when dissolved in distilled water. When a basic (alkaline) compound such as ammonia is added, the increase in pH alters its chemical structure and changes the color of the solution to pink/fuchsia. This is a simple test for ammonia gas using litmus paper infused with phenolphthalein.

Related information or images
  • The number of strips per pack or vial is approximate.
  • Shelf life is at least 3 years if kept properly sealed after opening; 5 years is typical.
  • Available in larger sheets, 8x10" (200x250mm), by special order.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo Phenolphthalein test paper ammonia detection Stability Statement Indigo Phenolphthalein test paper ammonia detection Certificate of Analysis Indigo Phenolphthalein test paper ammonia detection SDS
Reviews (3)

Great service! Product as described!

— Jude

Product was received quickly after order. Works just as advertised. An easy method to look for small ammonia leaks.

— Deep River Curling Club
— Indigo:

Thanks for letting us know. This is an inexpensive way to test for coolant links whether it is a refrigerator or a hockey/curling rink. If you really have a burning design to know more about ammonia, read this: Ammonia-Refrigerant, Leak Detector & Disinfectant.

Fast service! Ordered and shipped on same day. Shipped on Thursday, received in rural NL on Monday. Product as described.
— DN
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