Is clr flammable? (A 5-point guide)

This article will answer the following question: “Is clr flammable?”. We will discuss all types of CLR products available to this date, their ingredients, hazards, and how flammable they are.

Is clr flammable?

Almost all CLR products are water-based and present no flammability, aren’t fire hazards, and will not ignite. Although, harmful gases, vapors and mists could evolve if they are heated. The CLR Spot-Free aerosol spray version is highly flammable.

What is CLR?

CLR is the name of a brand, but it became known as a synonym for a line of cleaning products.

CLR brand is a 3 generation family company, it started in 1947.

The slang CLR states for Calcium Lime Rust. The products can dissolve CLR stains and agglomerates made from calcium, lime, and iron oxide deposits.

The CLR products have an acid nature that allows the dissolution of base compounds. The mechanism of action is an acid-base reaction.

Almost all CLR products are water-based and present low flammability because of that.

CLR ingredients

Since there are many CLR formulations, their ingredients vary. Although, most of the products are practically made of weak acid water-based solutions. Among the most common ingredients, we note:

  • 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

What can be cleaned using CLR?

The uses of CLR products are wide. Each product has a specific kind of action and must be applied according to it. The correct use of CLR products depends on the instructions on each label.

Products can be used to clean the following:

  • Cloudy glasses
  • Rusty toilets
  • Mold and mildew
  • Stainless steel
  • Clogs
  • Bathtubs
  • Silver pieces
  • Hard water stains
  • BBQ grills
  • White carpeting
  • Holiday decorations
  • Boats
  • Tarnish from some metals
  • Washing machines
  • Showerheads
  • Bike chains
  • Lawn sprinklers

Although, no CLR product works for all of these purposes at once.

Especially when it comes to metals, only CLR Metal Clear products are suggested, others can tarnish your silvery. 

The manufacturer suggests that products such as Tarn-X Remover should be applied for no longer than 2 minutes, and must always be tested in a small and inconspicuous area before cleaning the entire piece.

Overall flammability

All liquid forms of CLR are non-flammable. The formulas are composed of compounds such as diluted lactic acid, and other nonhazardous ingredients. 

CLR products and hazards

CLR Calcium, Lime & Rust Remover Enhanced Formula

Used to tackle tough calcium and lime deposits and rust stains.

The formula is specially designed to clean stains from bathtubs, toilet bowls, sinks, glass, chrome, fiberglass, stainless steel, kettles, humidifiers, dishwashers, washing machines, and showerheads.

The product is a clear and colorless liquid. Has a mild vinegar odor.

The product is an aqueous acidic cleaner. It’s considered corrosive and dangerous to the environment. For us, it may be skin irritating and cause burning feelings.

  • Ingredients: lactic acid, d-gluconic acid, water, and others (non-hazardous).
  • The product is considered not combustible, flammable, or fire-hazardous.
  • Physical and chemical properties such as boiling point, density, melting point, vapor pressure, water solubility, and evaporation rate are all similar to water.
  • pH: between 2.10 – 2.30

CLR Bathroom and Kitchen

It’s destined to clean water spots, showerheads, and dirt buildup around toilets. This product is a multipurpose and multi-surface cleaner formulated to quickly cut through dirt, calcium, lime, hard water deposits, and soap scum.

Among the many cleaning uses this product has, we point: ceramic tiles, shower doors, sinks, bathtubs, white grout, toilet bowls, fiberglass, and kitchen benches.

The product is a clear colorless liquid and has a mild lavender odor.

This product is signed as skin corrosive and irritating. Can cause severe burns and eye damage. Vapors and mists may arise from it, they should never be inhaled. It’s also toxic to the environment.

  • Ingredients: diluted lactic acid, water, and other non-hazardous.
  • The content is not considered combustible, flammable, or fire hazardous. In an eventual fire, the risks involved are due to the toxic vapors generated, but the product itself does not burn.
  • Physical and chemical properties such as boiling point, density, melting point, vapor pressure, water solubility, and evaporation rate are all similar to water.
  • pH: between 2.4-2.6.

CLR BBQ Grill Cleaner

This is a pump product destined to remove grease and oils.

CLR BBQ Grill Cleaner has a foaming trigger that can be used for both the inside and outside of grills, smokers, and deep fryers. 

Unlike other CLR products, this one is a base, not an acid. Its pH is high, so it’s better to test it in a small area before spraying it into all of your appliances.

Due to its base nature, the product is considered corrosive and irritating to our skin. It May cause skin, eye, and respiratory irritation if directly applied to someone.

  • Ingredients: Potassium hydroxide, sodium metasilicate, monoethanolamine, water, and other non-hazardous ingredients.
  • The content is not considered combustible, flammable, or fire hazardous. In an eventual fire, the risks involved are due to the toxic vapors generated, but the product itself does not burn.
  • Physical and chemical properties such as boiling point, density, melting point, vapor pressure, water solubility, and evaporation rate are all similar to water.
  • pH: around 12.

CLR METAL CLEAR

This label is a multi-purpose cleanser or cleaning and shining metal, porcelain, granite, laminated, and other hard surfaces.

It’s mildly abrasive but shouldn’t scratch most surfaces. It’s meant to polish and shine stainless steels, porcelains, granites, and other surfaces.

The product has a few restrictions to use. It must not be used with strong oxidizing agents, acids, bases, and bleach. Side reactions may occur and unleash toxic vapors under mild conditions.

Its routes of exposure are mainly through direct contact with our skin or eyes, besides inhalations and swallowing.

  • Ingredients: anhydrous aluminum silicate, sodium silicate, disodium cocoamphodiproprionate, and methanol.
  • The content is not considered combustible, flammable, or fire hazardous. Although methanol is flammable, it’s only a minor constituent of the formula, so the product is still not considered flammable.
  • Physical and chemical properties such as boiling point, density, melting point, vapor pressure, water solubility, and evaporation rate are all similar to water.
  • pH: between 11.30-11.90.

CLR Spot-Free Stainless Steel, Aerosol Spray Can

Different from the others, this product is not liquid. 

This product is a highly flammable spray aerosol.

CLR Spot-Free Stainless Steel Cleaner is formulated to work in stainless steel appliances and cookware, such as refrigerators, dishwashers, ovens, stoves, countertops, and barbeque grills. 

The product works by removing dirt, residue, and fingerprints from steel surfaces. It also leaves a streak-free, shiny protective barrier against further stains.

The product is made with petroleum distillates and other organic propellants that are highly flammable. This should never be handled around any source of ignition such as flames, sparks, and intense heat. The product must be stored below 120ºF.

  • Hazard Ingredients: Petroleum Distillates, White Mineral Oil, Surfactant, Propane-Butane Propellant. 
  • Most of its ingredients are very flammable. The product must be used in a well-ventilated area so no flammable mists are formed mid-air.
  • Physical and chemical properties: the product is an aerosol. Properties such as pH, boiling point, and flash point are not applicable for practical use.
  • The most probable routes of exposure to this product are inhalation and direct skin contact. Direct inhalation may cause several illnesses, including heart rhythm irregularities, shortness of breath, unconsciousness, or death.

Is CLR septic safe?

According to the manufacturer:

“Yes, CLR is septic safe. By the time it reaches the septic system it is neutralized with water.”

Most CLR products are acids considered chemically weak. Once in the septical system, it’s expected to dilute and perhaps found a base compound from another source, to become neutralized.

Conclusion

CLR is a brand that has many labels. Most of its products are considered not flammable because they’re water-based and don’t possess flammable ingredients. An aerosol spray label named Spot-Free Stainless Steel, although, is highly flammable.

Frequently Asked Questions (FAQS): Is clr flammable?

is clr poisonous?

Not especially. Some CLR products are considered safer for humans and the environment according to the United States Environmental Protection Agency.

Safer Choice is a standard that helps consumers and commercial buyers to identify products with safer chemical ingredients, without sacrificing quality or performance. Products that are contemplated with this title get to use a label that says so.

is clr safe for toilets?

Yes. According to the manufacturer, cleaning toilets is one of the basic functions of most CLR products. 

The products work by removing stains and agglomerates made from calcium, lime, and iron oxide deposits. It can remove persistent strains made from hard water and other sources.

CLR is an effective cleaner because has a low pH, capable of neutralizing the lime compounds left in your toilet.

is clr food safe?

CLR is not exactly a sanitizer and it should not be used directly on foods, or any appliance where food is processed. Some CLR products are made to be used in the kitchen but none has the required standards to be considered food safe.

CLR products are cleansing products made to work against hard stains and depositions of calcium, lime, and rust.

Citations

https://clrclean.com.au/wp-content/uploads/2021/04/SDS-CLR-Calcium-Lime-Rust-Nov-2020-2025.pdf
https://clrclean.com.au/wp-content/uploads/2021/04/SDS-CLR-Bathroom-Kitchen-Cleaner-Apr-2021-2026.pdf
https://clrclean.com.au/wp-content/uploads/2021/04/SDS-CLR-Oil-Grease-Remover-Nov-2020-2025.pdf
https://www.epa.gov/septic/how-your-septic-system-works
https://clrclean.com.au/wp-content/uploads/2017/10/MSDS-CLR-OIL-AND-GREASE-REMOVER.pdf
https://m.media-amazon.com/images/I/512um4cIJEL.pdf
https://m.media-amazon.com/images/I/51SMZp21gmL.pdf
https://m.media-amazon.com/images/I/51SMZp21gmL.pdf

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