Which Candle Raw Materials Should I Keep as Safety Stock Because Running Out Would Stop My Entire Production Line?

Not every stock-out is equal

Safety stock is the material you hold beyond what you expect to use before the next delivery arrives. It costs cash and shelf space, so it should go where a stock-out does the most damage. The useful question is not "how important is this material?" but "if this ran out tomorrow, what share of my production would stop?" For a shared wax, the answer is all of it. For the jar and wick used by most SKUs, most of it. For an oil used in one candle, a sliver — and that SKU can usually wait a few days for its bottle without the rest of the workshop standing still.

There is a second question: can anything stand in for it? In candle-making the honest answer is almost always no, not without testing. CSI publishes no wick-size-per-diameter chart, no equivalence between its wicks, and no data that would let one wax replace another in your formula without a retest. So a stock-out cannot be patched by grabbing the nearest substitute — which is precisely why the shared materials need a buffer.

Step 1: map every material to the output it stops

The example range is the reader's: four fragrances — Neroli, Palo Santo, Fresh Strawberries and Spicy Raspberry — in 200 g White Matte Glass Jars (the reader's weighed fill), with Neroli and Palo Santo also in the 85 g Golden Aluminium Tin (published fill). Everything is poured in Luxury Soy Wax CSI 464 at 8%; the jars use the reader's tested Eco Thick C2 wick and the tins Eco Thin C1. 310 candles a month, about 10.3 a working day.

Four materials land in tier A: the wax (100% of output), the White Matte jar and its Thick C2 wick (71%), and the wick stickers (100%). Tier B holds the tin and its wick and the two oils used in two SKUs each. Fresh Strawberries and Spicy Raspberry, each in one SKU, are tier C. Two things are missing from that table that belong in tier A as well: the scale and the thermometer. Neither is consumed, but if either breaks, every pour stops — the answer there is a spare, not a number of days. Notice too that combining by material raises a line's tier: a jar shared by four SKUs is one stock line, as the one-jar post shows, and an oil shared by two products is one bottle, as in the one-oil post.

Step 2: days of cover by tier

Express safety stock as days of normal use — it scales with the business automatically. This page uses labelled example tiers: A = 14 days, B = 7 days, C = 0 days (tier C lines simply run on their reorder points). Daily use comes from the month's need with allowances — one QC candle per SKU, an example 3% reject rate, 4% pour loss on wax and oil, 2% breakage on glass. Safety stock sits on top of the stock you hold to cover your supplier's lead time; that lead-time cover is the subject of separate reorder points per material, since CSI publishes no lead times.

The tiered buffer holds about ₹26,866.27 of material; fourteen days of everything would hold ₹35,523.41 — ₹8,657.14 more, almost all of it in the oils and the tin line, none of which would stop more than two-fifths of output. The wax buffer is the largest single line, about 24.5 kg of CSI 464; that is what protects every candle you make. Wicks and stickers are tiny in value and enormous in consequence, which is why they sit in tier A with a full 14 days. Glass is the one tier A line that also breaks in storage, so its buffer carries its own breakage — buffer for glass versus wax and oil explains the difference — and if a large order might need emergency remakes, the remake-inventory post sizes that separately from safety stock.

Step 3: build the buffer once, in real packs

Safety stock is built once and then maintained: every regular order replaces what you used, and the buffer stays on the shelf, rotated first-in-first-out so it never ages. The build below rounds each tier A and B line to the cheapest in-stock CSI packs and adds a spare Pen Thermometer and Candle Making Weighing Scale (₹354.00 each). Tier C lines are not on it.

Three rounding notes. CSI 464 is ₹507.40 a kilo in 1 kg, 5 kg and 10 kg bags, so the cheapest cover for the wax buffer is 2 × 10 kg + 4 × 1 kg + 1 × 500 g — the 500 g bag is ₹520.00 a kilo, so it is only used to land on the need. The Thin C1 10-pack was out of stock on the 4 October 2026 re-check, so small wick buffers start at 20. Neroli and Palo Santo are priced linearly from 100 g up (₹6.66/g and ₹6.02/g), so their buffers sit in 100 g, 50 g and 15 g bottles rather than a 500 g bottle that would hold far more than seven days.

Buy now, buy after testing

Only approved materials belong in safety stock — a buffer of something you have not tested is not protection. The natural next step for a business that worries about its shared wax is a qualified backup: a second wax that has passed in your formula and could be switched to if the first were unavailable. That is a test, not a purchase. Buy Luxury Soy Wax Chunks 1 kg (₹599.00) for a side-by-side trial at your 8% load against CSI 464 — its page states a 13% ceiling, so 8% is inside it — and only if it passes your burn, throw and appearance checks write it into your approved-materials list. Do not stock 10 kg of an untested backup.

The tier-A materials

Setting safety stock for your own range

The next post, shared wax versus a slow oil, compares two extremes side by side; different lead times adds the lead-time cover that sits underneath safety stock; and ordering for 20% growth shows how a cover grows with the business. The whole pipeline is on the cluster hub.

Frequently asked questions