chemistry

Quaternium-15

Quaternium-15 is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Quaternium-15 rather than just read about it. In short: Quaternium-15 (systematic name: hexamethylenetetramine chloroallyl chloride) is a quaternary ammonium salt that has been used as a surfactant and preservative. It acts as an antimicrobial agent because it slowly releases formaldehyde, which is a preservative with biocidal properties.

Key takeaways

Quaternium-15 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Quaternium-15 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Quaternium-15 from memory before moving on to harder problems.

Reference excerpt

Quaternium-15 (systematic name: hexamethylenetetramine chloroallyl chloride) is a quaternary ammonium salt that has been used as a surfactant and preservative. It acts as an antimicrobial agent because it slowly releases formaldehyde, which is a preservative with biocidal properties. Both quaternium-15 and formaldehyde release agents have been the subjects of controversy. They are banned in much of the US and Europe. It can be found under a variety of names, including Dow Chemical Company: Dowicil 200 (cis isomer only), Dowicil 75 and Dowicil 100 (both a mix of cis and trans isomers).

Synthesis Quaternium-15 can be prepared by treating hexamethylenetetramine with 1,3-dichloropropene. A mixture of cis and trans isomers are produced.

Applications The isolated cis-compound is used primarily in cosmetic applications, with a maximum permitted concentration in the EU of 0.2%. The mixed product (cis- and trans-) is used in a wider range of formulations such as: emulsifiable metal-cutting fluids, latex and emulsion paints, liquid floor polishes and floor waxes, and glues and adhesives.

Safety concerns Quaternium-15 has been banned in the EU since 2017 and a bill was introduced in the US in 2017 to require the FDA to investigate its safety.

Allergic reaction Quaternium-15 is an allergen, and can cause dermatitis. Many of those with an allergy to quaternium-15 are also allergic to formaldehyde. At low pH values, it would be expected to release significant amounts of formaldehyde due to acid hydrolysis via the Delepine reaction. Allergic sensitivity to quaternium-15 can be detected using a patch test. It is the single most often found cause of allergic contact dermatitis of the hands (16.5% in 959 cases). In 2005–06, it was the fourth most prevalent allergen in patch tests (10.3%). Even though quaternium-15 releases low amounts of formaldehyde, Johnson & Johnson announced plans to phase out its use of quaternium-15 in cosmetic products by 2015 in response to consumer pressure.

Illustrations

Worked examples

Example 1 — a first encounter with Quaternium-15

Start with the simplest possible case. Write down what Quaternium-15 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Quaternium-15 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Quaternium-15 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Quaternium-15

In research: Quaternium-15 appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Quaternium-15 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Quaternium-15 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkene derivatives, Chlorides, Cosmetics chemicals, so understanding it makes those chapters shorter.
In everyday life: Look for Quaternium-15 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Quaternium-15 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Quaternium-15 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Quaternium-15 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Quaternium-15 in simple terms?

Why does Quaternium-15 matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Quaternium-15?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Quaternium-15.