I Want to Make Small 50 g and Large 500 g Candles with the Same Soy Wax — How Do I Test Whether One Wax Performs Well Across Very Different Container Sizes?

Test the two ends of your range, in the same wax, before calling it one wax

One soy wax can serve a range from 50 g to 500 g — many makers run exactly that — but you cannot know it will until you have tested both ends of the range in that wax. The reason is simple geometry. A small candle has far more surface per gram than a large one, so it cools and sets quickly, melts a full pool fast and burns for a short life. A large candle cools slowly, has a wide pool to reach, a long burn to survive and a lot more fragrance in it. A wax that gives a smooth, well-behaved 200 g candle has been tested in the middle; the ends ask different things of it.

So the test is built around the ends. Make the smallest and the largest candle you sell in each candidate wax, with the wick each size needs, and score them on the lines each size is most likely to fail: wick overpowering and overheating at the small end; tunnelling, slow set, sinkholes and frosting at the large end; and appearance at both. If one wax passes both ends, the sizes in between need only a short confirmation. If a wax passes one end and fails the other, you have learnt that it is not one wax for your whole range — and the cost section shows what running two waxes would cost instead.

The example uses two CSI waxes that differ in what their pages publish. CSI's product page for CSI 468 states a melting point of 50–53°C, a pour temperature of 58–60°C and a fragrance load of up to 13%. The page for Natural Soy Pearl publishes no melt point, pour temperature or ceiling, but it is the only CSI soy wax with a per-kilo price break, which matters if one wax is going to carry the whole range. Neither is presented as the better wax for multiple sizes; the range test decides.

What changes between a 50 g and a 500 g candle

Put some illustrative geometry on it. These diameters are not CSI jar dimensions — measure your own. Take a 50 g candle 5 cm across and a 500 g candle 10 cm across, and convert with an approximate 0.88 g of wax per ml (a labelled figure; confirm with a weighed pour). The small candle has a 19.63 cm² surface on a fill about 2.89 cm deep: 0.393 cm² of surface for every gram. The large candle has 78.54 cm² on a fill about 7.23 cm deep: 0.157 cm² per gram. The small candle has 2.5 times as much surface per gram. Surface is where heat leaves the wax as it sets and where the flame meets it when it burns.

The wick changes with size — that is expected — but the wax does not. That is the point of the test: you are asking whether one wax gives a workable candle with an appropriate wick at each size, not whether one wick works everywhere. CSI does not publish wick-size charts, so each size gets its own starting wick and, if needed, its own bracket. The 300 g double-wick case goes deep on the large-pool end, and testing one wax across fragrances is the other half of the "one wax for everything" question.

Why the same wax can pass one end and fail the other

In general candle-making practice, soy waxes set by crystallising over a range of temperatures, and the speed of cooling commonly shapes how they look afterwards. A 50 g candle crosses that range in minutes; the centre of a 500 g candle can stay liquid far longer, contracting as it goes and giving crystals more time to grow. Some waxes look much the same at both speeds. Others commonly give smooth small candles and cratered or frosted large ones, or the reverse. That is behaviour of the wax, and CSI publishes no data on how any of its waxes responds to cooling rate — the range test is how you find out.

Burning adds a second difference. A small pool is reached quickly and can become deep relative to the candle's size, so a wick that is generous for the diameter can overheat a small jar. A large candle has to keep reaching its edge for burn after burn, and its lower third sits close to the flame for a long time. The wax's melting behaviour interacts with both, which is why a wax that burns cleanly in 50 g may need a different wick construction — or may not work at all — in 500 g. None of this is a verdict on a wax; it is the reason a single mid-size test is not enough.

Fragrance follows mass. At the same 8%, the 500 g candle carries ten times the oil of the 50 g one. If a wax holds the oil well in fast-setting small candles but shows sweating in slow-setting large ones, the shelf candles at each end will show it. Oil droplets after warm storage covers that symptom in detail.

The range test, candle by candle

Each wax gets 4 small candles (50 g, Heart Cutout Velvet Jar, 4 g oil + 46 g wax) and 3 large candles (500 g, your jar, 40 g oil + 460 g wax), all with British Rose at 8%. Of the small ones, three are burned and one is kept on the shelf; of the large ones, two are burned — one of them to the end of its life — and one is kept. These counts are labelled working practice.

Read across the two columns. The question is not which wax makes the better 50 g candle; it is whether each wax passes both columns. The objective comparison protocol covers the head-to-head scoring if both waxes pass; whether a wax that needs many wick tests should be your commercial wax is worth reading if one wax passes only after a separate bracket at each size.

Cost per candle across the range, and the cost of two waxes

Here is each size's material cost in each wax, at the 5 kg wax rate (CSI 468 ₹637.00/kg, Natural Soy Pearl ₹424.80/kg) and British Rose at its 1 kg rate (₹3.07/g — about 10% cheaper per gram than its 100 g pack, one of the oils where the bigger pack is a real saving). Wicks are ₹5.90 (Thin C1) for the small sizes and ₹9.44 (Thick C2) for the 500 g, as an example. Labour, packaging, freight and GST are excluded.

The container dominates small candles: the ₹45.00 heart jar is most of a 50 g candle's cost whichever wax you choose, while in the 500 g candle the wax and oil are the cost (and your jar adds to it). That is why a wax decision made on per-kilo price matters most at the large end. A 10 kg bag at 8% load makes 217 candles of 50 g, 127 of 85 g or 21 of 500 g before allowances.

If the range test says no single wax passes both ends, the alternative is two waxes — one for small candles, one for large. That is workable, but it is not free. You hold two stocks (at minimum a 5 kg bag of each: ₹3,185.00 + ₹2,124.00 = ₹5,309.00 if the two waxes in this example split the range), you keep two sets of temperatures and batch sheets, every new fragrance needs testing in both, and staff can pour the wrong wax into the wrong jar. How much wax stock to hold and one wax across the whole collection cover the inventory and fragrance sides of that trade.

The priced range-test kit

Per wax: 4 × 46 g + 3 × 460 g = 1,564 g of wax, or 1,642.2 g with a 5% pour-loss allowance (a working assumption). Both waxes share one British Rose lot: 272 g of oil, 285.6 g with allowance.

After the test, 357.8 g of each wax is left — enough for the middle-size confirmation in 85 g tins and a retained sample of each lot. Natural Soy Pearl's smallest listed bag is 1 kg, so two are needed; CSI 468 also comes out at two 1 kg bags (₹1,300.00).

The decision rule, and the bag to buy

Then buy. If Natural Soy Pearl passes both ends, its 10 kg bag (₹4,248.00, ₹424.80/kg) covers the whole range from one stock. If CSI 468 passes both ends, its 10 kg bag is ₹6,370.00 (₹637.00/kg); a 5 kg bag (₹3,185.00) costs the same per kilo, so choose by how fast you use it. Either way, buy the small containers in the pack that matches your run — the Heart Cutout Velvet Jar is ₹45.00 each at every listed pack size, so there is no saving in buying 10 rather than 5.

Related questions in choosing a soy wax

Size is one axis of "one wax for everything"; fragrance family is the other. These siblings cover the neighbouring questions.

Frequently asked questions