Should I Buy Six Months of a Critical Wick If the Supplier Has Long Lead Times or Maintain Less Inventory and Reorder More Frequently?

Your critical wick, made precise

The worked example, labelled. Your larger candles, 300 g at 8% (24 g of oil and 276 g of wax, load as a percentage of total weight) in your own 9 cm jar, run on Cotton Braided Wicks Ready Made. Getting there took work: the first wick tunnelled, and a double C2 sooted by hour three, so Cotton Braided is the rung that passed full-life testing in every third. It's "critical" because there is no sized, tabbed CSI wick above it and nothing between it and C2, so if you run out there is no nearby wick to borrow without re-running that approval. You use about 400 a month including rejects (92.3 a week). Your supplier's lead time from order to door is about 6 weeks (yours to measure; CSI publishes none), and each new lot spends about 1.5 weeks in its check before release. You're weighing one six-month order of 2,400 wicks against ordering as you go.

Four things are actually being traded: cash (money sitting in a box of wicks), lots (each new one needs a check, and each is a small chance of a burn change), formula risk (stock bought for a formula that might change), and supply risk (running out during a long wait). The safety stock itself is 6997's method, used here with the worked example's figures; the full purchase-quantity formula is 6999. This post is about cadence.

What a long lead time really asks of you

A long lead time feels like a reason to buy a lot at once. Mostly it's a reason to order before you need to. Demand over the effective lead time (7.5 weeks) is 693 wicks; add a 173-wick safety stock (6997's method, with a weekly standard deviation of 18 and a lead-time spread of a week, both labelled) and the reorder point is 866. Compare that with your stock position, which is wicks on hand + orders placed but not arrived + packs arrived but still in their lot check, and order whenever it touches 866. On monthly orders that means about 1.7 orders are in the pipeline at any time. That isn't a problem; it's what a long lead time looks like when it's handled.

Where long lead times do push towards bigger orders is uncertainty. If your supplier's six weeks is sometimes ten, the lead-time spread dominates the safety stock (6997 shows why), and a bigger order buys calm. The cheaper fix is usually to measure and steady the lead time: log the order and arrival date of every pack, and ask the supplier for a realistic estimate. Ask us on WhatsApp for an honest dispatch estimate to your city; we'll tell you what's typical and won't promise what we can't.

What goes wrong with each strategy: causes, ranked

The ranking is our judgement for a small maker holding one critical wick; the table separates what customers do with your candles from what you make, store and buy, because one of them can trigger the most expensive mistake on the list.

Row 6 is the expensive one for a six-month holder. A single black-rim photo, usually about trimming, burn length or a ceiling fan, can panic someone into writing off 2,000 wicks. Burn one retained candle from the complaint batch the way your label says first (what to retain and how to use it); clean under the label points to burning habit, not the wick. Row 3 is the mirror image: in this series alone, formulas move wicks for soot (6930), load changes (6929) and dye (6933). If any of those is likely in the next six months, the six-month box becomes a write-off. For the published case of buying 5,000 wicks before testing, see the post on replacement wicks bought before testing.

Six months, two months or one: the numbers

Read the table from the bottom up. If your supplier can keep sending the same lot, monthly ordering wins on every line: least cash, one check, least risk. If every order is likely to be a new lot, the lot checks dominate and the six-month buy looks cheapest on paper, but only by carrying the two big risks: a formula change that strands stock, and one lot failing with ₹28,800.00 of wicks attached to it. The two-monthly cadence sits between them on both counts. Argued against our own interest: we'd happily sell you 2,400 wicks today, and it would not save you a rupee per wick. The case for it is lots, and you can often get the lot benefit without the six-month box (next section).

Two notes on the figures. The lot check is priced on the worked example's six-candle side-by-side burn (three new-lot candles against three retained) at 1 kg oil and 10 kg wax prices: ₹1,441.17, excluding retained wicks, jars and the ten days of bench time, which is often the bigger cost. And if your critical wick is Eco Thick (C2) rather than Cotton Braided, the cash lines scale down (six months of C2 at 400 a month is ₹22,656.00), but the lot-check line doesn't, which pushes the answer further towards fewer lots.

The decision rule, and the staged middle path

The staged middle path, worked example: order one 1,000-pack now (₹12,000.00) and check it. If it passes, order the remaining 1,400 (₹16,800.00) asking for the same lot, and check that it is. You've bought six months of one lot with one full check and a quick goods-in comparison, while keeping ₹16,800.00 of cash and all of the formula-change risk deferred by a month or two. At CSI, whether the second order can come from the same lot is a WhatsApp question: our pages publish no lot information and we won't promise lot continuity we can't see. For setting this up across several wicks, the published post on bulk-buying one wick size after every fragrance has been tested is the companion read.

Storing six months of wicks, and the month-3 check

Space isn't the issue: 2,400 pre-tabbed wicks fit in a carton you can lift with one hand. Condition is. Keep packs sealed in their bags, in a closed box, flat so the wicks don't kink, dry and dark, at room temperature, away from the pouring area. Indian monsoon humidity (roughly June–September) is the reason to add a sealed outer bag. CSI makes no shelf-life claim for wicks, and we know of no published figure for these products; the honest approach is to check stored stock rather than assume it.

Monthly buyers skip this check; it's one of the quiet costs of the six-month box. Materials for three candles are half of a lot check, about ₹702.58 at 1 kg oil and 10 kg wax prices, plus the bench time.

What to buy, and what to skip

Four items for the worked example, chosen on page statements, price and stock on 7 October 2026. CSI publishes no wick, soot, lot or lead-time data, so nothing is ranked on performance, and each card says when not to buy. CSI's sized, tabbed range is short: Eco Thin (C1), Eco Thick (C2) and Cotton Braided, with nothing in between and one wooden width; if your critical wick needs a size we don't sell, ask on WhatsApp and we'll say so plainly.

Skip for now: a six-month box for any formula that's new or due to change; a bigger pack "for the discount" (there isn't one per wick on C1, C2 or Cotton Braided); and a second critical wick bought as insurance without a test record.

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