How do you assess supplier risk when changing a raw material?
Summary
Proceed with a raw material supplier change when specification, trials and customer approval terms all clear; stage it when any customer requires notice or requalification. Wait when the specification omits a property that drives performance, or a customer must approve before shipment. The risk depends on material criticality, specification coverage, customer terms, regulatory coverage and the new supplier's lot history.
ICH Q7, the GMP guide for active pharmaceutical ingredients (Step 4, 10 November 2000), says written procedures should cover the review and approval of changes in raw materials (ICH, 2000).
ICH Q7 says full analyses should be conducted on at least three batches from a supplier before reducing in-house testing (ICH, 2000).
ICH Q9(R1), adopted 18 January 2023, describes risk as the combination of the probability of occurrence of harm and the severity of that harm (ICH, 2023).
The IPEC Significant Change Guide, Version 5 of 2023, evaluates a change's potential impact on an excipient to decide whether users or regulators should be notified (IPEC Federation, 2023).
This decision table is for industrial chemical makers and distributors moving a raw material to a new source. Medicinal products, excipients and automotive parts follow their own change rules, such as EU GMP, ICH Q7, the IPEC guide and the AIAG PPAP manual, which take precedence. Qualifying the new supplier's quality system is a separate question.
Why do the effects of a raw material supplier change show up late?
The effects of a raw material supplier change show up late because the first lots pass the specification, while the properties that fail are often not in the specification and only act in the customer's process, in storage or in service. A new source can meet every line of the certificate of analysis and still differ in trace impurities, particle size distribution, moisture pickup or isomer ratio. Those differences surface later as slower filtration, haze or a shorter shelf life.
Three things delay the signal. Old-source stock in tanks dilutes the new material for a while. Customers use product at their own pace, so a defect appears only when a changed lot reaches their line. Aging effects need time.
Pharmaceutical guidance treats material changes accordingly. EU GMP Chapter 5 says significant amendments to the manufacturing process, "including any change in equipment or materials, which may affect product quality and/or the reproducibility of the process, should be validated" (European Commission, 2014, section 5.25). ICH Q7 says the potential for critical changes to affect established retest or expiry dates should be evaluated, if necessary with stability testing of material made after the change (ICH, 2000, section 13.16). For an industrial raw material the same logic suggests planning the review period around the slowest effect, not the first passing lot. Generic switching guides stress a pilot run "for finding and resolving issues before starting full-scale production" (Alpha Software); a pilot catches process problems, but not slow aging effects.
Which conditions make a raw material supplier change low or high risk?
A raw material supplier change is low risk when the material does not drive any performance property, the specification covers every property that matters, no customer term requires notice, the new source is covered for your market, and the new supplier has a lot history. It is high risk when any one of those fails, and it must wait when a customer has to approve before shipment.
Judge material criticality by what the raw material does in the finished product. An active component, a surfactant that sets wetting, or a resin that sets cure is critical; a carrier solvent that evaporates fully in use usually is not. ICH Q7 bases sampling plans on the criticality of the material, its variability and the supplier's past quality history (ICH, 2000, section 7.33), and the same three factors fit an industrial change decision.
The decision table below decides whether a raw material supplier change can proceed, needs a staged trial, or must wait for customer notification or approval.
Your conditions | Risk level | What to do first |
|---|---|---|
Material drives no performance property; specification complete; no customer notice term; source covered for your market; supplier has lot history | Low | Check identity and specification on the first lots, then switch |
Specification covers performance properties; customer terms silent | Moderate | Run a plant trial, then evaluate the first batches made after the change (ICH Q7, section 13.15) |
Specification omits a property that drives performance in use | High | Add the property and test both sources side by side before any trial |
Customer contract or quality agreement requires notice of a new raw material source | High, staged | Notify the customer and agree the requalification plan before shipping changed product |
New source not yet covered for your market, or its SDS classification or listed impurities differ | High, wait | Confirm the source's registration status and SDS before any trial, and check whether your own SDS must change |
Customer must approve before shipment | Wait | Hold the change until written approval; keep old-source stock |
New supplier offers few or no production lots | Moderate to high | Run full analyses on several lots and compare with each certificate of analysis (ICH Q7: at least three batches, for APIs) |
The deciding row is the specification gap: a specification that omits a performance-relevant property cannot show that the new raw material is equivalent, however many lots pass. Close that gap first, because every other check depends on it.
Regulatory coverage can stop a change outright, whatever the trials show. Under REACH, substances shall not be manufactured in the EU or placed on the market unless they have been registered where registration is required (Regulation (EC) No 1907/2006, Article 5). In the US, EPA calls checking whether a chemical is on the TSCA Inventory a critical step before beginning to manufacture, which includes importing (US EPA). Ask the new supplier, or its importer, for the registration or Inventory status of the exact substance it will ship.
How do you compare raw material supplier options without looking only at the best case?
To compare raw material supplier options without looking only at the best case, write the same three answers for every option, including staying with the current supplier: what might go wrong, how bad it would be, and what would show it early. ICH Q9(R1) lists three questions that help define a risk: "What might go wrong?", "What is the likelihood (probability) it will go wrong?" and "What are the consequences (severity)?" (ICH, 2023).
Leave the likelihood qualitative unless you have data. Most buyers have no failure statistics for a supplier they have never used, and an invented percentage makes a weak option look precise. ISO 31000:2018 frames risk management as identifying, analyzing, evaluating, treating, monitoring and communicating risks (ISO, 2018). Monitoring is what keeps the downside in view after the decision.
The table below shows how a downside case per option looks for one raw material (illustrative).
Option | Downside case | Early signal | Switch condition |
|---|---|---|---|
Stay with current supplier | Supply interruption or price rise continues | Late deliveries, allocation notices | Second interruption in the review period |
Switch fully to new supplier | Changed lots fail at a customer after shipment | Certificate values drift toward a limit | Any property outside the agreed range |
Stage: blend or dual source | Two sources run in parallel and both need checks | Lot-to-lot spread widens | Staged lots pass for the agreed review period |
The staged row is the one most comparisons leave out, and it often carries the lowest downside because the old source stays qualified.
Which early signals should you watch after changing a raw material supplier?
After changing a raw material supplier, watch incoming certificate values against their limits, lot-to-lot spread, processing behavior in your own plant, retained-sample aging and the first customer feedback on changed lots. Each signal should have an owner and a review date written before the first changed lot arrives.
Incoming values. Plot each certificate value from the new source next to the old source's history. A value inside the limit but at its edge is a signal, not a pass.
Lot-to-lot spread. A wider spread than the old source shows a less controlled process even when every lot conforms.
Processing behavior. Track filtration time, dispersion time, viscosity build or reaction exotherm in your own production; these often move before any certificate value does.
Retained samples. Keep samples of the first changed lots and of the last old-source lots, and compare them at the same ages.
Customer feedback. Tag every complaint and technical question by whether the shipped lot contained new-source material. ICH Q7 says there should be an evaluation of the first batches produced or tested under a change (ICH, 2000, section 13.15), and EU GMP Chapter 5 says a full analysis at appropriate intervals should be compared with the supplier's certificate of analysis to check its reliability (European Commission, 2014).
When should you stop or reverse a raw material supplier change?
Stop or reverse a raw material supplier change when a stop condition written before the change is met: a property leaves the agreed range, a customer complaint is traced to new-source material, a required customer approval is withheld, or the new supplier announces its own process change. Writing these conditions first keeps the decision from being argued away once money and time are spent.
Reversal is only possible while the way back is open. Keep the old supplier qualified, keep old-source stock or a supply commitment for the review period, and record what reversal would cost at each stage: before the first changed lot ships, after it ships, and after the old source is released.
Customer terms set some stop points for you. Automotive suppliers work to the AIAG PPAP manual, which AIAG describes as the industry standard for production part approval (AIAG, PPAP-4). A customer change notice form built on Table 3.1 of the PPAP manual, 4th edition, lists "Bulk Materials: New source of raw material from new or existing supplier" as a reason for notification (Accuride, Form P100). In API manufacture, ICH Q7 says current dosage form manufacturers should be notified of changes that can impact the quality of the API (ICH, 2000, section 13.17).
Once a stop condition is met, quarantine the changed lots in stock, tell affected customers, and rerun the decision table with what the failed lots showed.
What should you ask a new raw material supplier before switching?
Before switching, ask a new raw material supplier who makes the material and where, how it is made, which test methods stand behind the certificate of analysis, how many production lots exist, and what notice it gives before changing its own process. The answers decide which row of the decision table applies.
Manufacturer and site. EU GMP Chapter 5 says that, where possible, starting materials should be purchased directly from the manufacturer (European Commission, 2014, section 5.27). A trader's material may come from several plants.
Process route. A different synthesis route or feedstock can change the impurity profile while every specified value stays the same.
Test methods. Ask for the method behind each certificate value; the same property measured by another method may not compare.
Production lots. Ask for samples from at least two or three production lots, not a lab lot (illustrative). Ask for each lot's certificate.
Change notice. The IPEC Federation recommends that excipient suppliers and users base notification requirements in quality agreements and supply agreements on its guide (IPEC Federation, 2023). An industrial buyer can ask for the same commitment in writing.
Call in your quality lead, or the customer's technical team, when the material is critical to a customer's process or the customer terms are unclear. Lubinpla runs this kind of feasibility review from your own supplier documents and site history: it lays out scenarios, early signals and switch conditions for each option, invents no probabilities, and leaves the decision to people.
Frequently asked questions
Do you have to tell customers when you change a raw material supplier?
It depends on the contract, the quality agreement and the industry. Automotive customers working to the AIAG PPAP manual list a new raw material source among the changes that need notification (Accuride, Form P100). In API manufacture, ICH Q7 says dosage form manufacturers should be notified of changes that can impact API quality (ICH, 2000, section 13.17). Read each customer's terms before the first changed lot ships.
How many lots should you test from a new raw material supplier?
No single number fits every material. For active pharmaceutical ingredients, ICH Q7 says full analyses should be conducted on at least three batches before reducing in-house testing (ICH, 2000, section 7.31). Industrial buyers often use that as a reference point and add lots when the material is critical or its lot-to-lot spread is wide.
Is a matching certificate of analysis enough to approve a new raw material supplier?
No. A certificate of analysis covers only the properties it lists, measured by the supplier's methods. EU GMP Chapter 5 says the buyer should also perform a full analysis at appropriate intervals and compare it with the supplier's certificate to check its reliability (European Commission, 2014). Properties outside the specification still need a trial.