Calcium Lime Rust
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Calcium Lime Rust, more commonly known as CLR, is a household cleaning product used for dissolving stains, such as calcium, lime, and iron oxide deposits. It is made by American company Jelmar LLC.
Ingredients
CLR's ingredients may include various compounds:[1][2]
- Water
- Lactic acid
- gluconic acid
- Lauramine oxide
- Propylene glycol
- n-Butyl ether
- Glycolic acid
- Sulfamic acid
- Disodium capryloamphodipropionate
- ethylene glycol n-butyl ether
- Citric acid
One formulation is (by weight) lactic acid 12–18%, gluconic acid 2.50–3.75%, lauramine oxide 1.50–3.25%, with the remainder being water.[3] The product also contained phosphoric acid at one time,[citation needed] but it is now phosphate-free.
Mechanism of action
Weak acids, such as lactic acid, citric acid, and phosphoric acid, are commonly used in cleaning products like CLR to effectively dissolve calcium deposits and rust.[citation needed] These acids work by reacting with the calcium carbonate and iron oxide present in the stains. The chemical reaction results in the formation of soluble salts, which can be easily rinsed away with water. [citation needed]
Dissolution of calcium deposits
Calcium deposits, primarily composed of calcium carbonate (Page Module:Chem2/styles.css has no content.CaCO3), react with weak acids to form calcium salts that are soluble in water. The general reaction can be represented as follows:
Page Module:Chem2/styles.css has no content.CaCO3 + 2H+ → Ca2+ + CO2 + H2O
Here, Page Module:Chem2/styles.css has no content.H+ represents the hydrogen ions provided by the acid. The calcium ions (Page Module:Chem2/styles.css has no content.Ca2+) and carbon dioxide (Page Module:Chem2/styles.css has no content.CO2) are formed, which helps in the easy removal of the deposit.
Removal of rust
Rust, which is primarily composed of iron oxides (Page Module:Chem2/styles.css has no content.Fe2O3), also reacts with weak acids to form soluble iron salts. The reaction can be simplified as:
Page Module:Chem2/styles.css has no content.Fe2O3 + 6H+ → 2Fe3+ + 3H2O
In this process, iron ions (Page Module:Chem2/styles.css has no content.Fe3+) are produced along with water, making the rust easier to remove without causing damage to the underlying metal or surrounding materials.[citation needed]
Maker
CLR is made by Jelmar LLC, an American company located in Skokie, Illinois. The company was founded in 1967 by Manny Gutterman. As of 2019[update], the company was still owned and operated by Gutterman's family.[4]
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content.Goldberg, F. J. (February 1, 2003). "C L R - CALCIUM LIME & RUST REMOVER MATERIAL SAFETY DATA SHEET" (PDF). Bemidji State University. Archived from the original (PDF) on February 4, 2018. Retrieved February 4, 2018.
This product contains the following toxic chemicals subject to the reporting requirements of Section 313 of the Emergency Planning and Community Right To Know Act of 1986, as amended, and of 40 CFR 372 (for SARA 313)
- ^ Page Module:Citation/CS1/styles.css has no content.Gaudreault, R. A. (March 1, 2017). "CLR PRO CALCIUM, LIME & RUST REMOVER SAFETY DATA SHEET" (PDF). CLR brands - Jelmar. Archived from the original (PDF) on February 5, 2018. Retrieved February 4, 2018.
SECTION 3 - COMPOSITION /INFORMATION ON INGREDIENTS
- ^ Page Module:Citation/CS1/styles.css has no content."Jelmar - Material Safety Data Sheet - CLR Calcium Lime & Rust Remover - Enhanced formula - DfE" (PDF). Jelmar LLC. Archived from the original (PDF) on August 21, 2017.
- ^ Page Module:Citation/CS1/styles.css has no content.Hall, April (November 2019). "Family cleaning brand remains untarnished". Family Business Magazine. Retrieved August 2, 2023.
