Should I Keep Two Approved Suppliers for Critical Candle Raw Materials Even If the Backup Supplier Costs Slightly More?

What a primary stock-out puts at risk

The title gives no numbers; everything here is a labelled worked example on the series default candle, 200 g at 8% (184 g wax, 16 g oil, total-weight basis), at 600 candles a month. Wax is at your primary supplier's worked ₹520.00 a kilo; fragrance is Lavender at its CSI kilo price; jar and label are yours.

Wax is in every candle, at 110.4 kg a month (₹57,408.00 at the primary price). If it runs out, production stops for every SKU at once. A single fragrance running out stops one scent. That asymmetry is the first reason wax heads the list for dual sourcing.

What one stock-out costs is your own number; here is how the worked ₹45,000.00 is built (labelled):

How to build the first two lines properly (lost and delayed orders, rush prices, idle labour, the retest risk of an emergency substitute) is the stock-out cost post; this post uses its output.

What two approved suppliers cost

Why give the backup 20% of volume at all, instead of qualifying it and buying nothing? Because a backup you never order from is not warm: its lots may change without you knowing, it will not prioritise you in a shortage, and your team forgets how it pours. A regular share keeps the supplier, the material and your process current. If 20% is too much for your volume, 10% halves the premium; below that, the backup tends to go cold. The premium here is labelled 5%; if a backup is much dearer than that, the break-even shifts right, and safety stock may win.

What the backup saves, and the break-even

The break-even is a single division: expected stock-outs a year at break-even = annual cost of two suppliers ÷ loss avoided per stock-out = ₹13,494.47 ÷ ₹40,000.00 = 0.34. If your primary has run out roughly once in the last three years or more often, the backup is cheap insurance; if it has never run out in five years and has a good stock record, you are in the shaded zone and safety stock may be the better tool.

Compare that with the obvious alternative, holding extra stock of the primary. Six weeks of extra wax ties up ₹86,112.00 and costs about ₹861.12 a month to carry at a worked 1% a month (₹10,333.44 a year), less than two suppliers. But safety stock only covers a stock-out shorter than the cover; it does nothing about a discontinued grade, a supplier that closes, or a bad lot you discover after pouring. Dual sourcing covers all three. Many makers do both: a few weeks of stock, and a qualified backup for the long tail. Whether larger stock is worth its cash at all is the ₹1 lakh inventory-risk post; whether a cheaper supplier's frequent stock-outs outweigh its price is the stock-out cost post again.

The premium and the share matter less than you might expect, because the qualification and upkeep are fixed and the loss avoided per stock-out is large. Even a 20% share at an 8% premium breaks even below one stock-out every two years in the worked case. The figure that really moves the answer is the cost of a stock-out: halve it and every break-even doubles. That is why a maker selling mostly made-to-order gifts, who can delay without losing customers, may rationally run on one supplier and safety stock, while a maker with retail listings that disappear when out of stock should not.

On the premium itself: a backup supplier who knows they are the backup will price accordingly. Tell them the share and the schedule, ask for their price at that steady volume, and review it once a year alongside your primary. The conversation about when your volume earns a better price is the when-to-ask post; it applies to a backup as much as to a primary.

Which materials deserve a second supplier

Fragrance is the hard case. A wax from a second supplier can be qualified to behave the same in your candles; a lavender from a second supplier smells like a different lavender, and your customers may notice. For a bestseller, the better insurance is usually deeper stock of the exact oil and honest questions to your supplier about batch consistency, continuity and reformulation notices: the batch consistency and availability post lists them. If you do qualify a second source for a top scent, treat it as a new candle and test it blind against the original.

Wicks are the opposite case: hard to dual-source and cheap to stock. A "same size" wick from another supplier is a burn-test question, while a month of C2 for 600 candles costs ₹5,664.00 and about ₹679.68 a year to carry at 1% a month. Why it makes sense to hold more safety stock of wicks than of expensive oils is the wick safety-stock post. Jars sit in between: a second compatible jar needs dimension, heat and wick checks, and is usually only worth it at scale; the jar supplier stock-outs post weighs months of jar stock against a second supplier.

Qualifying and keeping a backup approved

The qualification cost is front-loaded, which is why makers put it off until a crisis, and why a crisis then forces an untested substitute. The worked ₹9,611.02 is less than one third of a single worked stock-out. If you are standardising your range on one wax anyway, qualify its backup at the same time: the one-commercial-wax post covers the standardising decision.

With CSI: two grades, one supplier

We sell several container waxes, and some makers approve two of them, for example CSI 464 and Chunks, so that one grade running short does not stop production. That is a sensible hedge against a grade stock-out. It is not dual sourcing: if our dispatch from Pune is delayed, both grades are delayed together. Chunks also cost ₹17.02 more per 184 g candle than CSI 464, so a backup share in Chunks carries its own premium.

What we can do: sell test quantities at production prices (CSI 464 is the same per kilo from 1 kg to 10 kg), provide lot details with orders, GST invoices, and MSDS and IFRA documents for oils on request. What we will not do is promise stock depth or lead times here; check availability per size on the store and confirm dispatch on WhatsApp. For a committed share with scheduled releases, the structures are compared in the per-order or committed-volume post.

Materials for primary, backup and safety stock

Two waxes (one as primary or backup, one to show that two grades are not two suppliers), one oil best protected by safety stock, and the wick that is cheaper to stock than to dual-source. Chosen on page statements, price and stock on 4 October 2026; CSI publishes no throw or burn data, so nothing is ranked on performance.

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