What is N-Octadecane CAS 593-45-3?

N-Octadecane CAS 593-45-3, also called octadecane or C18 paraffin, is a straight-chain saturated alkane with the formula C18H38 and a molecular weight of about 254.5 g/mol. It is supplied as a high-purity solid or liquid depending on storage temperature.

How is N-Octadecane used in textiles, building materials and cold-chain packaging?

The material can be encapsulated and incorporated into cooling bedding, sportswear, wallboards or packaging to moderate temperature swings. It absorbs heat when ambient conditions rise and releases heat as they cool, helping keep the surrounding environment within a narrower temperature range.

Is N-Octadecane chemically stable enough for encapsulation?

As a non-polar paraffin, n-octadecane is chemically inert under normal conditions and non-corrosive. These properties help it remain compatible with encapsulation systems and reduce the risk of attacking container, shell or construction materials during repeated melting and freezing cycles.

What are the key specifications and appearance changes of this product?

The product page specifies GC purity of at least 99.0% and a melting point of 28-30 C. Below about 28 C it appears as a white crystalline solid or flakes, while above 28 C it becomes a colorless transparent liquid; boiling point is about 317 C and flash point is above 165 C.

How should temperature-sensitive N-Octadecane be stored?

Store it in a cool, ventilated area in tightly closed steel drums or IBC tanks. Because its physical state changes near 28 C, avoid unnecessary exposure to high heat and ensure the container remains suitable for either solid flakes or liquid product.

N-Octadecane CAS 593-45-3

N-Octadecane, CAS 593-45-3, is a high-purity straight-chain C18 paraffin supplied for phase-change materials, smart textiles, building insulation, cold-chain logistics, chemical synthesis and laboratory standards. Confirm the required purity and grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 593-45-3
Synonyms: N-Octadecane / Octadecane
Einecs: 209-790-3
Molecular Formula: C₁₈H₃₈
Grade: Industrial Grade / PCM Grade / Reagent Grade
Package: 150kg Iron Drum or 750kg IBC Tank

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Product Description

N-Octadecane, CAS 593-45-3, also called octadecane or C18 paraffin, is a straight-chain saturated alkane.

Synonyms: N-Octadecane / Octadecane.

CAS: 593-45-3.

It has a molecular weight of about 254.5 g/mol and appears as a white crystalline solid or flakes below about 28 °C.

Above about 28 °C it becomes a colorless, transparent liquid.

It has a GC purity of not less than 99.0% and a melting point of about 28–30 °C.

It has a boiling point of about 317 °C and a flash point above 165 °C.

As it melts it absorbs latent heat, and as it solidifies it releases that stored heat for passive thermal buffering.

It is used in microencapsulated cooling bedding, sportswear and temperature-regulating textiles.

It is incorporated into wallboards, roofing materials and packaging to moderate temperature swings.

It is used in cold-chain shipping containers to help maintain specific temperature ranges for pharmaceuticals.

It is used as a raw material for surfactants and emulsifiers, and as a non-polar solvent in organic reactions.

It is used as a GC reference standard for retention times of petroleum fractions.

Confirm appearance, GC purity, melting point, boiling point, density, flash point, refractive index, water content, sulfur content and solubility.

Store in a cool, ventilated area, preferably below 25 °C, away from direct sunlight, open flames, sparks and heat sources.

Keep containers tightly closed and undamaged, as the product may leak if it melts during transport in hot weather.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required purity and grade, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is N-Octadecane CAS 593-45-3?

A: N-Octadecane CAS 593-45-3, also called octadecane or C18 paraffin, is a straight-chain saturated alkane with the formula C18H38 and a molecular weight of about 254.5 g/mol. It is supplied as a high-purity solid or liquid depending on storage temperature.
Q:
Why is the melting point of N-Octadecane important for phase-change applications?

A: Its melting point is around 28 C, close to comfortable indoor and body-contact temperatures. As it melts it absorbs latent heat, and as it solidifies it releases that stored heat, making it suitable for passive thermal buffering without electrical input.
Q:
How is N-Octadecane used in textiles, building materials and cold-chain packaging?

A: The material can be encapsulated and incorporated into cooling bedding, sportswear, wallboards or packaging to moderate temperature swings. It absorbs heat when ambient conditions rise and releases heat as they cool, helping keep the surrounding environment within a narrower temperature range.
Q:
Is N-Octadecane chemically stable enough for encapsulation?

A: As a non-polar paraffin, n-octadecane is chemically inert under normal conditions and non-corrosive. These properties help it remain compatible with encapsulation systems and reduce the risk of attacking container, shell or construction materials during repeated melting and freezing cycles.
Q:
What are the key specifications and appearance changes of this product?

A: The product page specifies GC purity of at least 99.0% and a melting point of 28-30 C. Below about 28 C it appears as a white crystalline solid or flakes, while above 28 C it becomes a colorless transparent liquid; boiling point is about 317 C and flash point is above 165 C.
Q:
How should temperature-sensitive N-Octadecane be stored?

A: Store it in a cool, ventilated area in tightly closed steel drums or IBC tanks. Because its physical state changes near 28 C, avoid unnecessary exposure to high heat and ensure the container remains suitable for either solid flakes or liquid product.

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