2685 Almond Drive, PO Box 600, Silver Springs, Nevada 89429   office@granitepropane.com
(775) 577-2361

Open Monday-Friday: 8AM-5PM

Mercaptan Detector Strips

Mercaptan detector strips are a simple and cost-effective method of detecting mercaptan at its threshold limit value (TLV) concentration. Use them to detect mercaptan in the environment or in any chemical plant that uses or produces mercaptan. Understandably, they are a valuable resource for any business where gasses and chemicals are present.


Methanethiol (also known as methyl mercaptan) is an organosulfur compound. Mercaptan is a colorless gas with a distinctively putrid smell similar to cooked cabbage or flatulence. It’s a natural substance found in humans, animals, and plants. Additionally, mercaptan is found in certain foods, such as nuts and cheeses.

Mercaptan is highly flammable and is often released as a by-product of kraft pulping in pulp mills. In kraft pulping, lignin is depolymerized by a nucleophilic attack with the strongly nucleophilic hydrosulfide ion (HS) in a highly alkaline medium. However, in a side reaction, HS attacks methoxyl groups (OMe) in lignin, demethylating them to give free phenolate groups (PhO) and releasing MeSH.

MeSH is readily deprotonated (MeSNa). The formed MeS ion is also a strong nucleophile, reacting further to dimethyl sulfide. Meanwhile, the compounds remain in the liquor and are burned in the recovery boiler. Finally, sulfide is recovered as sodium sulfide.

Methanethiol is mainly used to produce methionine, which is used as a dietary component in poultry and animal feed. Additionally, Methanethiol is used in the plastic industry. Frequently, it’s used as a moderator for free-radical polymerizations and as a precursor in the manufacture of pesticides.

Mercaptan is also used in the natural gas industry as an odorant, due to its ideal compatibility with methane. Naturally, its characteristic “rotten egg” smell is widely known by natural gas customers. Understandably, this smell is an indicator of a possible gas leak.

Mercaptan is released from decaying organic matter and is present in natural gas. Additionally, it can be found in coal tar and in some crude oils. It is highly toxic at high concentrations. Exposure affects the central nervous system. Its penetrating odor provides warning at dangerous concentrations. The United States OSHA Ceiling Limit is listed as 10 ppm.


These are paper strips impregnated with a sensing chemical by a special process to detect mercaptan in air. Originally, these strips will appear yellow in color, and on exposure to mercaptan turn to pink. Keep an eye on them regularly. Naturally, you should maintain stock on hand to ensure safety.

Color change time duration is related to the concentration of mercaptan in the air. Naturally, it provides a semi-quantitative method of detection of mercaptan in the air in the range of 0.5 to 10 ppm. These strips of 7 X 1 cm are bound in a booklet of 20 strips each.


C4H9 SH + HgCl2 →(CH3) 3 CS.HgCl + HCl

HCl + Base + pH indicator → Chloride


  • –   Easy to handle
  • –   No technical skill required
  • –   Sharp color change on exposure to target gas
  • –   No other chemicals or solution required
  • –   No other costly accessories required


It is best suited for the spot check of toxic gas detection.

It is useful for the air investigation at workplace & confined space such as:

  • –   Petrochemical & Refineries
  • –   Chemical & Fertilizer
  • –   Fumigation Pulp & Paper Mills Industries
  • –   Municipal Departments
  • –   Environmental monitoring agencies and many more


First off, tear out one strip from the booklet and place it in the measurement area. If the air contains mercaptan, the detector strip changes its color from yellow to pink. Note down the time it takes to change color from yellow to pink.

The concentration is inferred from the mercaptan sensitivity table given below. For example, if it takes 5 minutes to change the color from yellow to pink the mercaptan concentration is 5 ppm. In other words, if it takes two minutes to change the color, the concentration is 10 ppm.

Mercaptan Detector Strips
Mercaptan Detector Strips

Form Downloads


Data Sheet

Naturally, you can contact us for information on Mercaptan Detector Strips Ask us about any questions or concerns you might have. Call us at any time: (775) 682-0269. Thank you.

Mercaptan Detector Strips Purchase – $105


$105 per package of strips. Each package contains 6 booklets of strips with 20 strips in each booklet, a total of 120 strips. Shipping and handling included.





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    2685 Almond Drive
    PO Box 600
    Silver Springs, Nevada 89429
    Phone: (775) 577-2361
    Open Monday - Friday 8:00 AM - 5:00 PM
    24/7 After Hour's Service Number: (385) 264-7221