How do you ship candles without breakage or melting?

Ship candles so the glass cannot touch anything hard and the wax cannot get hot enough to soften: each candle wrapped and held still in a strong box, a pack you have drop tested, and a summer plan based on your wax's melt point. Carrier hazardous materials rules are built around liquids and their flash points: USPS Publication 52, section 343.1, treats a liquid with a flash point of 140°F (60°C) or below as flammable and limits it to ground shipment as a Limited Quantity. Those rules matter for fragrance oil, diffuser base and room spray. For wholesale cases, the lead-wick statement goes on the outer carton when a wick has a metal core.

What the carrier rules cover

USPS Publication 52 regulates flammable and combustible liquids (hazard class 3) by flash point [1]. A finished solid candle is not a liquid, and nothing in section 343 addresses solid candles. If you are unsure how a carrier treats a product, Publication 52 says a mailer who needs help determining a hazard class can request a ruling from the Postal Service's Pricing and Classification Service Center (PCSC) [2]. Private carriers publish their own rules; read them for any product you are unsure of.

The liquids you might sell alongside candles are a different matter. The short version of USPS's classes, from Publication 52 section 343 [1]:

In the words of section 343.1, a flammable liquid is "A liquid that has a flashpoint of not more than 140° F (60° C)," a combustible liquid is one that "has a flashpoint above 140° F (60° C) and below 200° F (93° C)," and "A liquid with a flashpoint above 200° F (93° C) is not regulated as a hazardous material" [1].

International mail of flammable and combustible liquids is prohibited [1]. Packaging Instructions 3A (flammable) and 3B (combustible) in Publication 52's Appendix C set the container limits and markings; for example, a combustible liquid above 140°F to 200°F may go in a primary receptacle of no more than 1 gallon, with cushioning and absorbent, sealed secondary packaging, a strong outer box and the DOT Limited Quantity mark [3][4].

Fragrance suppliers sometimes state their own line differently. CandleScience says "Fragrances that have a flashpoint of 141°F or less are unable to be shipped via USPS" and must go by ground, and that all its oils are above 141°F [5]. That is CandleScience's shipping policy for its own products. The rule in Publication 52 is the 140°F definition above. Do not confuse these shipping lines with the Federal Hazardous Substances Act's labeling lines (20°F, 100°F and 150°F, as CPSC states them), which decide what a consumer liquid's label must say, never how it ships [8]. The full explanation, with the DOT definitions in 49 CFR 173.120, is on what a fragrance oil's flash point means.

Packing glass so it arrives whole

1. Let the candle cure and set completely. A candle shipped soft dents and smears.
2. Put the lid on and secure it. A loose lid rattles against the glass. Tape it or use a shrink band (lids, dust covers and shrink bands).
3. Wrap each candle. Paper, foam sleeves or bubble wrap around the whole jar, with the bottom and the top covered as well as the sides.
4. Give each candle its own space. Use a divided insert, a molded pulp or foam holder, or enough cushioning that no candle can touch another candle or the box wall.
5. Fill the empty space. If the box rattles when you shake it, it will break in transit. Add fill until nothing moves.
6. Use a box strong enough for the weight. Glass candles are heavy for their size. A box that crushes under another parcel lets the jars meet.
7. Seal and label. Tape every seam, and put the address label on the largest flat face.
8. Add the care card and invoice inside, where they cannot slide between jars.

Test your pack before you trust it

None of the standards or protocols cited here sets a candle shipping test; Kohl's candle protocol 100-Z, revised February 2025, sets burn and labeling tests but no packaging, transit or drop test [6]. So run your own. Pack a box exactly as you will ship it, with real candles, and drop it onto a hard floor from about the height of a loading dock or a delivery driver's arms on each face, edge and corner. Open it. If anything cracked, moved or dented, change the pack and repeat. Then ship two or three boxes to friends in different zones and ask for photos on arrival.

Heat in transit

Container wax is soft on purpose, and a box can sit in a hot truck or on a sunny porch. What happens depends on your wax's melt point and the time it spends warm.

• Know your wax's numbers. Melt point, and whether your candles will survive a hot car puts the melt points from named data sheets side by side and gives a home heat test modeled on a supplier's oven test. Run it on your own candle at your own load.
• Ship standing up. If the top softens, an upright candle has a better chance of resetting level. Mark the box "This side up."
• Shorten the time in transit in summer. Ship early in the week so parcels do not sit in a depot over a weekend, and choose faster services for hot destinations.
• Tell customers what to expect. A candle that arrives softened can be left to cool upright before it is lit. Say so on your shipping policy.

Case packing for wholesale

Shops buy by the case, and a case has more to carry than a single parcel.

Ask each shop how it wants cases marked and whether it has a maximum case weight. Larger retailers write this into vendor manuals (what larger retailers require).

When a candle arrives broken

Have a policy before it happens: ask for a photo of the box and the candle, replace or refund, and keep the photos. They tell you whether the problem was the pack (a crushed box, a jar that moved) or the carrier (a box that was dropped hard), and what to change. A jar that cracks while burning is a different problem and a safety one (cracked or broken candle jars).

Where shipping fits the rest of selling

Shipping cost belongs in your price, and the fees on a marketplace apply to the shipping you charge as well as the candle. Selling candles online works through both. For cases going to shops, selling candles wholesale covers minimums, line sheets and what shops ask for.

References

1. United States Postal Service, Publication 52, Hazardous, Restricted, and Perishable Mail, section 343 Flammable and Combustible Liquids (343.1, 343.21, 343.22, 343.3), undated page, read October 22, 2026. https://pe.usps.com/TEXT/pub52/pub52c3_022.htm
2. United States Postal Service, Publication 52, section 333 Consumer Commodity, undated page, read October 22, 2026. https://pe.usps.com/text/pub52/pub52c3_013.htm
3. United States Postal Service, Publication 52, Appendix C, Packaging Instruction 3A (Flammable Liquids), undated page, read October 22, 2026. https://pe.usps.com/text/pub52/pub52apxc_010.htm
4. United States Postal Service, Publication 52, Appendix C, Packaging Instruction 3B (Combustible Liquids), undated page, read October 22, 2026. https://pe.usps.com/text/pub52/pub52apxc_011.htm
5. CandleScience Support, What does the fragrance flashpoint mean?, updated May 1, 2026. https://support.candlescience.com/en_us/what-does-the-fragrance-flashpoint-mean-H1whhmgsZl
6. Kohl's, Private Brands Performance Claims Test Protocol 100-Z: Candle (including freestanding, taper, tealight, votive, filled and novelty candles), revised February 2025. https://link.kohls.com/content/dam/klink/100-Z-CANDLE.pdf
7. U.S. Consumer Product Safety Commission, Candles Business Guidance, undated, read October 22, 2026. https://www.cpsc.gov/Business--Manufacturing/Business-Education/Business-Guidance/Candles
8. U.S. Consumer Product Safety Commission, FHSA Requirements (business guidance), undated, read October 22, 2026. https://www.cpsc.gov/Business--Manufacturing/Business-Education/Business-Guidance/FHSA-Requirements