What Makes a Candle Truly Sustainable? A Buyer's Guide
By Hayley Clarke, Co-Founder, CandleXchange
The word "sustainable" gets used a lot in the candle world. It appears on packaging, in Instagram captions, and across product descriptions — often with very little to back it up. If you care about buying well, it's worth knowing what to actually look for, because not all candles marketed as eco-friendly or natural are created equal.
This guide breaks down what genuinely matters when it comes to sustainable candles, so you can make an informed choice rather than take a brand's word for it.
Start With the Wax
The wax is the foundation of any candle, and it's one of the most important factors in both performance and environmental impact.
Paraffin wax is still the most widely used wax in the candle industry. It's a byproduct of petroleum refining, and when burned it can release trace amounts of chemicals including toluene and benzene. For a candle you're burning inside your home, that's worth knowing.
Soy wax is a plant-based alternative that burns more cleanly, produces less soot, and is biodegradable. It also tends to hold fragrance well and has a longer burn time than paraffin, which means you get more value from the same candle. The caveat: not all soy wax is equal. It's worth checking whether a brand uses 100% natural soy or a blended wax that mixes soy with paraffin.
All CandleXchange candles are made with natural soy wax, hand-poured in Australia with no paraffin blending.
Look at the Fragrance
This is where a lot of "natural" candles quietly fall short. Synthetic fragrance oils are extremely common and not inherently harmful, but they're worth being aware of if you're sensitive to chemicals or want a more natural product.
Pure essential oils are the most natural option — they come directly from plant material (flowers, leaves, bark, resin) and carry the genuine botanical character of the plant. The trade-off is that some essential oils don't hold their scent as long in a candle as synthetic alternatives, and they tend to cost more.
CandleXchange uses natural oils — pure essential oils and naturally-derived fragrance oils — free from synthetic chemicals. Several of our blends use pure essential oils, including Lemongrass, Lavender and Rose, and our Citronella, Lavender and Rosemary blend. Where we use naturally-derived fragrance oils, they're chosen for quality and safety, not cost alone.
The Container Problem Nobody Talks About
Here's the sustainability issue the candle industry largely ignores: the container.
Most candles come in glass containers, and most of those containers end up in landfill. Candle containers are made from tempered glass, which cannot be processed by any Australian kerbside recycling infrastructure. Australians buy approximately 4 million candles each year, and the bulk of those containers are single use.
This is the problem CandleXchange was built to solve. Our Return and Swap program means that when your candle is finished, you return the container to us and we refill it for the next customer. You receive 30% off your next purchase, and the glass stays in use rather than going to landfill. It's a circular model in the truest sense — and genuinely rare in the candle industry. To date, we've diverted 7.5 tonnes of glass from landfill through Return and Swap.
You can read more about how to prepare your container for return and what we do with it once it comes back to us.
Where Is It Made?
Buying locally made means shorter supply chains, lower transport emissions, and support for Australian workers and businesses. It also tends to mean better quality control, because the people making the product are close to it.
CandleXchange candles are hand-poured in Brookvale on Sydney's Northern Beaches. Every candle is made in small batches, which means more care and consistency in every pour.
Does the Brand Have a Broader Purpose?
Sustainability isn't only about environmental impact. It also encompasses the kind of business a brand is running — and who benefits from its success.
CandleXchange is a certified social enterprise operating two purpose-driven programs. Our Return and Swap program keeps CandleXchange containers in circulation — returned, cleaned, refilled, and back on the shelf. Our UpCandle program goes further: we collect used candle containers from any brand, clean and refill them, and donate them to domestic violence survivors as they move into new homes — more than 4,300 candles donated to date. It's not about what you buy — it's about what happens to all those containers that would otherwise go to waste.
Buying from a social enterprise means your purchase contributes to a model actively trying to do better — for the environment and for people.
What to Ask Before You Buy
If you want to cut through the greenwashing and make a genuinely considered choice, these are the questions worth asking of any candle brand:
- What wax do they use, and is it 100% natural soy?
- What happens to the container when the candle is finished?
- Are the fragrances natural, synthetic, or a blend — and are they transparent about it?
- Where is the product made?
- Does the brand have any verified social or environmental commitments beyond marketing language?
The answers will tell you a lot more than a "natural" label ever could.
The Bottom Line
A truly sustainable candle isn't just about what it's made from. It's about what happens to it after it's burned, how it was made, and what the company behind it actually stands for.
If you're ready to make the switch, browse the full CandleXchange range and see the whole picture for yourself.
Frequently Asked Questions
Is soy wax really more sustainable than paraffin?
Soy wax is a plant-based, renewable material that burns more cleanly and is biodegradable — making it a more environmentally considered choice than paraffin, which is a petroleum byproduct. That said, the full sustainability picture includes fragrance, container, and how the candle was made, not wax alone. A paraffin candle in a reusable container may have a lower overall environmental footprint than a soy candle in glass that goes straight to landfill.
Can candle jars be recycled in Australia?
No. Candle containers are made from tempered glass, which cannot be processed by any Australian kerbside recycling infrastructure. The vast majority of candle jars end up in landfill. CandleXchange's Return and Swap program exists specifically to solve this problem — returned containers are cleaned and refilled rather than discarded.
What does "natural fragrance" actually mean on a candle label?
There's no regulated standard for "natural fragrance" in the candle industry, which makes it easy for brands to use the term loosely. Genuine natural fragrances include pure essential oils derived from plant material, or naturally-derived fragrance oils that are free from synthetic chemicals. The clearest indicator is transparency — a brand that explains exactly what's in their fragrance blend is more trustworthy than one that simply labels it "natural."
What's the difference between Return and Swap and UpCandle?
Return and Swap is CandleXchange's own container program: when you finish a CandleXchange candle, you return the jar and we refill it — you receive 30% off your next order. UpCandle is a separate program for containers from any candle brand: we collect them, clean them, refill them, and donate them to domestic violence survivors as they settle into new homes. Both programs keep glass out of landfill, but they work differently and serve different purposes.