Ultimate Questions To Ask Before You Reject A Batch

Table of Contents

1 Five minutes that decide the claim
2
3 The evidence chain your supplier will test
4 Write the notice, not the complaint
5 Replacement, credit, or who pays
6 One incident, or a pattern?
7 When the supplier stalls
8 What this means in practice

In short: A rejected batch is decided less by the laboratory result than by what you did in the first hour, what you wrote in the notice, and whether the cost lands on the right side of the table. Here is the buyer’s side of that sequence.

The batch is in your warehouse, the numbers are outside specification, and your production schedule has a hole in it. The the deviation report you just read explained what went wrong; now the drums sit labelled and unopened.

In our experience supplying intermediates to buyers in India, Bangladesh and Pakistan, the outcome is usually settled before the first email is answered. The laboratory result creates the problem; the batch rejection itself is commercial. Most buyers run it badly — not for lack of leverage, but because they spend it in the wrong order.

Five minutes that decide the claim

A failing batch is not a disaster. A disorganised first hour is. The record you built on arrival is what you will argue from. The the six incoming checks gave you containers photographed as received, the batch number recorded against the delivery note, a sample retained under the specified condition, and a dated note of when the discrepancy was first seen. If they were not run properly, this is the moment that gap becomes expensive.

Three things matter in the first hour, and none is negotiation.

Segregate physically and label it. Move the batch to a marked hold area and label every drum HOLD — NOT RELEASED, with batch number and date. ICH Q7 §16 makes the same point from the manufacturing side: material that fails specification must be clearly labelled, physically segregated so it cannot be used by mistake, and its disposition documented. The rule is written for the supplier, but it describes the state your warehouse should be in.
Write down what you saw, not what you concluded. “Assay 97.2% against a 98.0% minimum, batch 2409A” is evidence. “Supplier sent substandard material” is an opinion, and an opinion is the first thing a supplier will refuse. Note the time, the person and the instrument.
Tell the supplier the same day. Not because speed wins arguments, but because delay works against you: most quality agreements and sales-law frameworks treat an unprotested delivery as accepted after a stated period.

The mistake we see most often: a buyer keeps the batch in quarantine for two weeks “getting organised” before making contact. By then the material has sat in their building long enough for the supplier to argue it was mishandled there.

The evidence chain your supplier will test

You do not need to prove the batch is bad. You need to prove it was bad when it left the supplier. Every batch rejection turns on that narrower claim, and the only one that survives.

The most useful document is a retained sample taken at arrival and stored correctly. It shifts the question from “is it out of specification now?” to “was it out of specification then?” — which both sides can test. Without it you are arguing about cause, and that argument cannot be won: the supplier’s counter-argument (something happened in your storage) is impossible to exclude.

Evidence	What it proves	What it does not
Retained arrival sample, stored to specification	Condition of the material on arrival	Nothing, without the storage log
Batch number match across COA, labels and delivery note	That you tested what the supplier shipped	Nothing, if the three disagree
Third-party result on a split sample	An independent measurement both sides accept	Nothing, if the lab is not agreed in advance

On the supplier’s side, we see far more disputes over method than over results. That last row is where most disputes turn. A supplier who disagrees with your in-house result is not necessarily stalling — they may believe their own data. The productive move is a split of the retained sample sent to a laboratory both sides accept, method agreed before it leaves. An a COA is not proof on its own: it reports selected results against selected limits, and says nothing about the impurity you found outside them.

If the failure touches a parameter that was never clearly fixed, the argument is not about the batch at all. It is about how the order was specified — much harder to win after delivery than before.

Write the notice, not the complaint

The first written contact decides whether you get a serious reply or a holding one. Most buyers send an emotional document; suppliers route those to a commercial contact and wait. A notice does four things.

Identifies the material — purchase order, invoice, batch number, quantity, delivery date. Precise enough that nobody asks which shipment you mean.
States the non-conformity in measurable terms — which parameter, which value, against which agreed limit, by which method. One line per defect.
States the remedy you want — replacement, credit, or review for conditional acceptance, with a date. Not a range; a chosen remedy.
States the window for reply — the line most buyers leave out.

On the response window: cross-border supply relationships commonly settle on five to ten business days for an acknowledgement and a course of action. A 24-hour deadline reads as a trap and invites a fight about reasonableness instead of about the batch. State the window and what happens if it passes, then follow it exactly.

Cite the standard you are invoking. Where what the quality agreement promised defines how a non-conformity is reported and how fast the supplier must respond, point at that clause. A notice quoting something the supplier already signed is not a negotiation — it is an administrative step they have to process.

Replacement, credit, or who pays

Three outcomes, and a fourth that is a slow-motion version of the third.

Outcome	Fits when	Watch for
Replacement	The material is still needed, the defect is clear, the production slot can be filled later	Replacement at the original price with no committed date. Get it in writing.
Credit / refund	You have sourced elsewhere, or the batch is not worth reworking	A credit note is only worth what your next order is worth. If you are switching, ask for money.
Conditional acceptance	The deviation is non-critical, documented, and your downstream process tolerates it	It releases the batch, not the risk. Concessions need written quality approval and a recorded downstream impact.

The instinct to reach for a discount is the one to resist. It converts a quality decision into a commercial one and moves the problem into your process, where it resurfaces with your name on it. If a supplier offers a price reduction before the root cause is discussed, that offer says something about their confidence in the investigation.

On leverage, one thing is worth knowing: payment terms decide how much of the claim you can enforce. A buyer who has paid in full with no orders pending is negotiating with a supplier who has already been paid. A buyer holding a balance against delivery, or with a repeat order in progress, is having a different conversation.

Cost allocation is a separate question, and buyers default to absorbing it — return freight, storage, re-inspection, disposal — usually without checking. That default is almost never what the contract requires. Three things decide it, all fixed before the problem existed.

The contract and remedy schedule. Where the supply terms put the cost of a non-conforming delivery on the supplier, that allocation does not vanish because pursuing it is inconvenient. Where they are silent, the legal default is often better than buyers assume.
The Incoterms in force. Who held risk at handover decides whether transit damage is your problem or theirs. It is the first place a supplier looks, so it should be the first place you look.
The cause. If the specification was yours and the material met it, the failure is not the supplier’s. Buyers lose credibility fast pushing a claim their own specification created.

Storage while the batch sits in dispute is the item buyers forget. If your notice sets a deadline, a documented daily storage figure from the rejection date belongs in the claim. If it sets none, the storage is your own problem, indefinitely. Never quote a figure you cannot support: an inflated claim gives the supplier a reason to dispute the whole notice, not one line.

One incident, or a pattern?

This question decides how far you push, and it is answerable from data you hold. A single rejection with a credible root cause and a closed corrective action is an incident; two in a year is a pattern. The difference is commercial: an incident is handled with the notice, a pattern at the level of the relationship. What to look at:

Outlier or trend? Pull your receipt data for the last several shipments and look at the spread. A batch-to-batch consistency review shows whether this is a step change or the far end of a distribution that has been widening for months. The widening distribution is the earlier, more serious signal.
Does the cause explain this batch, or excuse it? A cause that ends at something fixable is an investigation. One that begins and ends at “human error” with nothing attached is a description.
Is the corrective action closed, or promised? Ask what changed in the procedure, who verified it, and how they will show you it worked. If it cannot be demonstrated, it is a pattern with good manners.

If the supplier attributes the failure to the process itself, the question becomes technical rather than commercial. Understanding where the impurity came from — whether it purges downstream or accumulates — is the difference between a batch you can use and one you cannot, and your technical team can reason about it from the supplier’s own data.

When the supplier stalls

Silence is the most common response, and usually not malice — just a supplier with one person who can answer and no procedure telling them to. The escalation path is short, and should be followed in order.

Restate in writing, referencing the first notice. Same facts, same remedy, first notice attached. This step creates the record; it is not there to persuade.
Invoke the escalation clause. If the quality agreement says what happens when a response window passes, use it. If not, that gap is what to fix before the next order.
Pause new orders. From where we sit, this is the step that ends most stalls within a week. It is also the step buyers are most reluctant to take, and the one that produces a response fastest. It needs no argument and no change of tone — the order book simply stays where it is until the issue is resolved.
Decide whether to switch. Do it with the full cost in view, not the unit price. Re-qualification, a new sample cycle, documentation review and the risk of a worse supplier belong on the balance sheet — which is why the hidden cost of switching should be calculated before the decision, not after.

If you decide to switch, the transition itself carries risk: supply chain risk is highest precisely while you are moving between suppliers and have neither as a proven fallback.

What this means in practice

A rejected batch is not a quality event with a commercial consequence. It is a commercial event with a quality trigger — and buyers who treat it as the second keep most of their claim.

Everything above rests on three things decided long before the failure: the specification that defined “conforming”, the agreement that defined how a deviation is reported, and the payment structure that defines your leverage.

None can be renegotiated afterwards. What you control is the record you hold, the notice you write, and the speed of first contact — and when the claim closes, your supplier scorecard is where one incident becomes a trend line, and a trend line a sourcing decision. A rejection never scored is a rejection that will be repeated.