Shea Butter Quality Control for Buyers

A Certificate of Analysis describes one batch at dispatch. Transit heat, moisture ingress and time change free fatty acid and peroxide value. Identity and adulteration risk is the buyer's regulatory exposure — the Responsible Person or brand owner — not the supplier's. Incoming QC answers two questions the COA cannot: is this the product I approved, and has it changed since it was tested?

Two failure modes the programme catches: the shipped product differs from the approved sample, and the product deteriorated between dispatch and use. Pre-purchase due diligence is qualifying a shea butter supplier. The commercial arrival step is scaling from sample to container, step 8. Reading one COA, line by line, is how to read a shea butter COA. The steps below design the system you operate on every delivery.

Use the COA interpreter when you compare your result with the supplier's. Each parameter is explained on the specifications hub. For origin and grades, see the complete guide to shea butter. A plant that already receives drums can start here and only later open the qualification scorecard; a brand that has not yet placed a first order should not build a full incoming programme before it has an approval record to compare against.

The programme is a system, not a sequence you perform once. Sampling intensity, retains, the in-house bench, the third-party panel, the trend log and the non-conformance form have to exist before the first container arrives. Building them after a failed lot is how a claim window expires while you are still looking for a clean jar.

A lot is one supplier batch code. A consignment is everything on one bill of lading. A sampling unit is a drum, carton or pail. Sample every drum from a new supplier; move to the square-root-of-n-plus-one rule only after three conforming deliveries. That “n plan” is the practical rule used for pharmaceutical starting materials in WHO sampling guidance; it is a buyer convention here, not a shea-specific statute.

A solid fat is sampled at ambient with a clean stainless trier or corer from the top, middle and bottom of the drum — or by melting a whole small pack. Never partially melt a drum to “make sampling easier”: you will fractionate the fat and lie to yourself. Avoid condensation on cold tools. Clean tools between units. Use foil-lined or glass containers. Take at least 250 g of composite and 100 g per unit for laboratory plus retention.

Retains exist for dispute resolution, trend re-tests and complaint investigation. Without them you are arguing from memory. Ask the supplier to retain a sample of every dispatched batch too.

A buyer with a balance, an oven and a burette can run the three freshness tests that matter most on every lot; identity and contaminant tests are for a third-party laboratory at qualification and once a year. Method references are on shea butter test methods.

A minimum in-house kit is a 0.01 g balance, an oven, a burette and standardised sodium hydroxide, phenolphthalein, ethanol, melting-point capillaries and a water bath. That is enough to hold a supplier to freshness. It is not enough to call a fat shea when identity is in doubt. Write a one-page SOP for each in-house method that names the standard, the sample mass, the calculation and the person who may release the lot. A titration without a written method is a conversation, not a result.

Distinguish three numbers. The specification limit is the contract. An alert limit is internal and tighter — it triggers a look. The action limit equals the specification and triggers a non-conformance. Cosmetic leave-on limits are not soap limits. Soap tolerates a higher free-fatty-acid band because the free acids saponify — see soap makers and the shea saponification lye calculator. Food and pharmaceutical buying is dominated by contaminant panels — food manufacturers, pharmaceutical buyers. Cosmetic brands writing a first spec should also read sourcing step 3.

Log, per lot: receipt values, re-test values at 3, 6 and 12 months or at each production draw, the storage temperature log, and every time a container is opened. Storage practice is how to store shea butter to prevent rancidity. Glossary entries for rancidity, peroxide value and free fatty acid are the short definitions.

Expected behaviour: free fatty acid rises slowly and monotonically when moisture and lipase activity are present — a step change means water ingress or a heat event. Peroxide value rises during primary oxidation and can then fall as peroxides decompose into secondary oxidation products (aldehydes, ketones). A falling PV after a rise is not recovery; it is progression. Use p-anisidine value (AOCS Cd 18-90) and TOTOX = 2 × PV + p-AV to see the whole picture. A peroxide value that rises and then falls has not improved; the peroxides have broken down into the compounds you can smell.

Plot each lot's receipt FFA and PV against the supplier's declared specification. Three consecutive points trending toward the limit is a supplier conversation before a failure — see supplier corrective action. Log fields worth keeping: supplier and batch code; goods-receipt number and date; grade and intended application; receipt FFA, PV and moisture (your result and the COA); re-test dates and values; storage location and logged temperature range; container opened/closed events; a five-point odour note; whether an alert or action limit was breached and the NCR number.

Quarantine and label. Re-test in duplicate from the retained portion. If still out, send a portion to the agreed dispute laboratory. Classify. Decide disposition. Document. Notify the supplier within the claims window you wrote into the specification agreement. Contract manufacturers who run this file for several brands should keep one form and many application limits — see contract manufacturers.

A concession is written, time-limited and signed by QA. It never becomes the new normal. The quality page is the supplier-side status page; this section is the buyer-side procedure.

A supplier corrective-action request is 8D-lite: problem statement with data; containment (what happens to the lot); root cause (the supplier's investigation — intake FFA of kernels, storage, drum liners, transit); corrective action; verification on the next delivery; closure. Example timelines, buyer-set: acknowledgement in two working days, root cause in ten working days, verification on the next lot.

Fields worth putting on the form: buyer reference and date raised; supplier, batch code, quantity affected; class and parameter(s) with buyer result, COA value and dispute-lab result; containment; supplier root-cause analysis; corrective action and effective date; verification on the next delivery; closure signature and scorecard update. Feed the result into the qualification scorecard. Two majors in twelve months is a re-qualification, not a conversation.

Tick a step only when that step's own checklist is complete.