What makes an approved supplier list different from a contact list?

An entry on an approved list records a decision that somebody made, on a date, on stated evidence, for a defined scope. A contact list records that a company exists and sells something. The distinction has consequences: an approved entry authorises a purchase without further assessment, so it carries the weight of the assessment behind it. If nobody can say who approved an entry, when, on what basis and for which material, the document is a directory with a formal-sounding title.

How many approved sources should a material have?

Enough that losing one does not stop production, and few enough that each remains worth maintaining. The answer follows from consequence rather than from spend. A material that is embedded in a registered product, or that requires a long qualification, justifies a second approved source even at low volume, because the recovery time after a loss is measured in months. A material that is widely available, quickly substituted and lightly specified may reasonably have one, provided the decision is recorded as a decision.

Does an approval expire?

Not automatically in most systems, which is precisely the problem. Evidence ages: audit findings, documentation, ownership and the manufacturing site all change without anybody telling you. The workable arrangement gives each entry a review date proportionate to its criticality, and treats a source that has not delivered for an extended period as dormant rather than approved. Reactivating a dormant source should require a defined check, not a purchase order issued because the name was still on the list.

What should trigger a revision outside the review calendar?

Any event that changes the evidence the approval rested on. A notified change of manufacturing site, process route or raw material source. A change of company ownership or of the contracting legal entity. A significant quality event or a repeat of a previous one. A change in the regulatory position of the material or the market. A change in your own product that alters what the material must satisfy. Each of these invalidates part of the original basis, and the calendar is too slow to catch them.

How should a supplier be removed from the list?

Deliberately, and with the record preserved. State the reason, the date and who decided, and distinguish removal for cause from removal for disuse, because the two mean different things to whoever reads the file in three years. Keep the historical entry rather than deleting it, since lots purchased under that approval may still be in products on the market and the file has to explain why they were bought. A silent deletion destroys traceability while looking like housekeeping.

Building an approved supplier list, and keeping it honest

Company news · Eapearl Chemical · 16 April 2026

Most organisations have a list of approved suppliers. Rather fewer can say who approved each entry, on what evidence, for which material, and when that evidence was last looked at.

A list is a set of decisions, not a directory

The purpose of an approved supplier list is to let a purchase happen without repeating an assessment. That is a real saving and it is why the document exists. It also means that every entry carries the weight of whatever assessment stands behind it, and the document is only as sound as the weakest of those.

The usual way these lists decay is not dramatic. Names are added because an order was placed urgently and the list was updated afterwards to match reality. Entries acquire a scope of everything they have ever supplied, rather than the material they were assessed for. Nobody removes anything, because removal requires a decision and leaving a name costs nothing visible. After a few years the document describes the history of the purchasing department rather than the current state of the supply base.

Segment by consequence, not by spend

The first structural decision is how much apparatus each material deserves, and the common error is to sort by annual value. Spend is easy to obtain and almost irrelevant. What matters is what happens if the material stops arriving or arrives wrong.

Tier	Characteristic	What the entry needs
Critical	Embedded in a registered or qualified product; long requalification; a stoppage halts production	Full assessment on file, named scope, short review interval, second source actively maintained
Important	Specified material, replaceable but with a real trial burden	Assessment on file, defined scope, routine review, an identified alternative even if not yet approved
Routine	Widely available, lightly specified, quickly substituted	Basic checks recorded, longer review interval, no obligation to hold multiple approvals

A small-quantity specialty is frequently more critical than a bulk commodity, because it cannot be replaced quickly. Sorting the list by consequence puts effort where a loss would actually hurt, and it usually reveals at least one item that has been treated as routine for years and is not.

What an entry has to carry

Treat the list as a controlled document. Each entry should state the legal entity rather than only a trading name, the materials and grades the approval covers, the manufacturing site the approval refers to, the evidence on which it was granted, the person who granted it, the date, the review date, and the current status. That last field needs more than two values, because a supplier is not only approved or absent.

Approved — assessed, in use, evidence current, within its stated scope.
Approved with conditions — usable subject to a stated restriction, such as additional incoming testing or a limited grade range. The condition is written into the entry, not remembered.
Dormant — approved historically but not supplying, with a defined check required before reactivation.
Under assessment — a candidate, explicitly not purchasable yet. Making this a visible state prevents the most common leak, which is buying from a promising candidate before the assessment finishes.
Suspended — approval paused pending an open issue, with the issue referenced.
Removed — retained in the record with a reason and a date, never deleted.

The scope field does more work than any other. An approval granted for one grade from one site is not an approval for a different grade from a second site, even though the company name is identical. Without an explicit scope, the list will be read as a blanket endorsement, which is how a qualified source for one material becomes an unassessed source for three.

Approval decays even when nothing goes wrong

Evidence has a shelf life. An audit report describes a site as it was on a day. Documentation reflects a regulatory position at a point in time. Ownership changes, sites are added, experienced staff leave, and a process is optimised in ways that were never notified because the specification values did not move. None of this is misconduct, and none of it generates an alert.

So each entry needs a review date set by its tier, and the review has to be a real check rather than a signature. The minimum useful review asks four questions: is the legal entity and the site still what the entry says; has anything been notified since the last review; what does the performance record show; and is the documentation on file still current. If the answer to any of these is unknown, the entry is not current and should be marked accordingly rather than renewed by default.

Triggers that outrun the calendar

A notified change of site, process route, raw material source or analytical method. This is what the change notification clause exists to produce, and its output has to reach the list.
A change of ownership, or a change in the legal entity issuing the invoice. The assessed company and the contracting company must remain the same one.
A quality event, and more importantly a repeat of a previous one, which says something the individual incidents did not.
A shift in the regulatory status of the material or of the destination market.
A change in your own product or process that alters what the material has to satisfy. Your approval was granted against a requirement, and the requirement moved.
An extended period without deliveries, which should move the entry to dormant automatically rather than by anyone remembering.

Each of these invalidates part of the basis on which the approval was granted. That does not mean the supplier becomes unacceptable; it means the evidence no longer covers the current situation and the gap should be closed knowingly.

Second sources, and the difference between having one and maintaining one

A second approved source that has never delivered is a plan, not a capability. Approval and readiness are different states, and the distance between them is usually discovered during the incident the second source was meant to cover. For critical materials, either place periodic volume with the alternative so that the route stays exercised, or record honestly that the source is approved but untested at scale and state how long activation would take.

Recording the activation time is the part most often skipped, and it is the number the rest of the organisation needs. A source that can be running within weeks and one that would need a fresh plant trial are both approved, and they offer entirely different protection.

Removing a name without losing the history

Removal deserves the same discipline as addition. Record the reason and separate removal for cause from removal for disuse, because a future reader will need to know which occurred. Keep the historical entry: material purchased under that approval may still be in products on the market, and the file has to be able to explain why those purchases were legitimate at the time. Deleting the row removes the explanation while leaving the consequences.

Where removal is for cause, check what else the supplier was approved for. Problems are rarely confined to one material, and an issue that justified removal for one grade is at least a reason to review the others rather than to leave them standing because they are listed separately.

What a maintained list is worth

The test of the document is whether someone outside purchasing can use it to answer a question. Given a material, can they see who may supply it, for which grade and site, on what evidence, and when that was last confirmed? If they can, the list is doing its job for commodities such as toluene and sodium hydroxide as well as for specified materials such as L-methionine, where the consequence of an unassessed source is considerably larger.

If they cannot, the list is a habit. To request the documentation set that supports an assessment, or to discuss a specification against a named application, use our contact page.