Raw Material Substitution Checklist for Chemical Formulations

When do you need a raw material substitution checklist?

You need a raw material substitution checklist whenever a raw material in an existing chemical formulation must be replaced and the product still has to meet its specification, whatever the cause: discontinuation by the maker, a regulatory restriction or a supply failure. The checklist records the decision before anyone weighs out a bench batch, so the substitute is judged against the function the old material served, not against its name or its data sheet.

Three situations make the record more than a formality. In a process covered by the US process safety management standard, paragraph (l)(1) of 29 CFR 1910.119 requires the employer to establish and implement written procedures to manage changes, except for replacements in kind, to process chemicals, technology, equipment and procedures (OSHA, accessed 2026). The same standard defines the exception: "Replacement in kind means a replacement which satisfies the design specification." (OSHA, accessed 2026). In the EU, a mixture classified as hazardous needs a new classification evaluation when a constituent is substituted at or above the cut-off value (Regulation (EC) No 1272/2008, Article 15(2)). If a customer agreement or a customer's supplier manual asks for notice before a material or source changes, that notice belongs in section 5; read each agreement for the exact trigger.

A single work order is a different case. On the Elsmar Cove quality forum, one practitioner describes a substitution that applies only to one work order, with permanent changes handled through an engineering change request and notice (Elsmar Cove, 2011). The raw material substitution checklist on this page is built for the permanent case; a one-time deviation still needs sections 1 to 4, the release tests in section 5 and their acceptance criteria in section 6, and can skip the stability and document items in section 5 when they do not apply.

What does each section of the raw material substitution checklist cover?

The raw material substitution checklist has 6 sections, and each one fixes a fact the next depends on: what leaves, what it did, what could replace it, whether the replacement fits the rest of the formula, what must be retested, and what result counts as a pass. The table below previews every section and its fields so a formulator can decide what a substitute must re-prove before bench work; all example values are illustrative.

The key row is section 2: a substitute is accepted for the jobs the outgoing material did, so a checklist without a measured property for each job has nothing to accept against. Sections 3 to 6 each take that list of jobs as their starting point. Fill the sections in order: a checklist that jumps to candidates before section 2 is complete tends to compare data sheets instead of functions, and the revalidation scope then has no list of jobs to work from.

How do you record the outgoing raw material's function in a formulation?

You record the outgoing raw material's function in a formulation by listing every job it does, in the product and in the process, and tying each job to a measured property with a unit and a test method. An amine can set pH, neutralize a fatty acid into a soap that emulsifies oil, and help corrosion protection at the same time; a solvent can carry an active and also set the flash point and drying time.

For each job, the checklist asks four things. What property shows the job is done, such as pH at a stated dilution, emulsion stability after a stated time, or a corrosion rating in a named test. What value the current product achieves, taken from release data or the specification, not from memory. What happens if the material is removed or reduced, which tells you whether the job is critical or incidental. And which other components it works with, because a substitute that does the main job may break a pairing.

Record the process role too. Order of addition, the batch temperature at the point of addition and whether the material must dissolve before the next one goes in are part of its function. A substitute that is solid where the outgoing material was liquid, or that needs heat to dissolve, changes the batch procedure even if the finished product passes. Write down where each value came from, so a reviewer can tell a measured figure from an assumption.

How do you compare substitute raw material candidates on the checklist?

You compare substitute raw material candidates on the checklist by putting each one against the same rows: CAS number, active content as delivered, impurities and byproducts the specification limits, the dose that matches the outgoing material's active content, and the documents the supplier can provide. The same CAS number does not make a candidate equivalent, because grade, assay and impurities can differ between suppliers.

Start with identity. Copy the CAS number of each constituent from section 3 of the candidate's SDS, and note any constituent the outgoing material did not have. Then adjust the dose on active content: the candidate dose equals the outgoing dose times the outgoing active content divided by the candidate's active content. In the illustrative example, 8.0 wt% of a 99.0 % active material replaced by a 99.5 % active material gives about 7.96 wt%; the balance goes to water or carrier so the formula still sums to 100.

Next, the documents. Ask for the TDS, the current SDS with its revision date, and Certificates of Analysis for more than one lot, since a single CoA shows one lot, not the spread between lots; that is reasoning, not a sourced figure. Under the US Hazard Communication Standard, mixture makers "may rely on the information provided on the current safety data sheets of the individual ingredients", except where they know or should know the SDS misstates or omits required information (OSHA, 29 CFR 1910.1200, accessed 2026). Then run the compatibility review in section 4: each component pair, the pH and temperature window, and whether the change alters the mixture's classification.

Which revalidation tests does a raw material substitution reopen?

A raw material substitution reopens every test whose result depends on a job the outgoing material did, plus the documents that describe the product: specification tests, shelf-life stability, compatibility in use, the safety data sheet and label, and any customer notice. Section 5 of the checklist lists each item with a yes or no, and a no needs a written reason.

Specification tests come first. Mark each release test reopened or not from the function list in section 2. Shelf-life stability is reopened whenever the substitute could change long-term behavior, such as phase stability, color or viscosity drift; state the storage conditions and duration you will use. Compatibility in use covers dilution in local water and contact with the materials the product touches.

The safety data sheet has its own rules. In the EU, Article 31(9) of REACH requires suppliers to update the safety data sheet "without delay" when new information on hazards, or new information that may affect risk management measures, becomes available, and to send the dated revision to all recipients supplied within the preceding 12 months (Regulation (EC) No 1907/2006, Article 31, ReachOnline 2026). In the US, significant new hazard information "shall be added to the safety data sheet within three months" (OSHA, 29 CFR 1910.1200(g)(5), accessed 2026). For a hazardous mixture in the EU, CLP Article 15(3) does not require the new evaluation if "there is valid scientific justification that this will not result in a change of classification" (Regulation (EC) No 1272/2008, Article 15). Customer notice follows each customer's own agreement.

How do you fill in the raw material substitution checklist, step by step?

You fill in the raw material substitution checklist in seven steps, in section order, and you freeze the acceptance and stop criteria before the first bench batch is made.

1. Section 1: copy the outgoing material's identity from its SDS and the formula record, enter its weight percent as delivered and as active, and state the reason it leaves and the last date it can be bought.

2. Section 2: list each job the material does, the property that shows it, the current value with its source, and the process role.

3. Section 3: enter each candidate on the same rows, calculate the dose on active content, and list documents received and missing.

4. Section 4: review each component pair and the process steps, and mark pass, caution or fail with the reason.

5. Section 5: mark each revalidation item yes or no; give a reason for every no.

6. Section 6: write one acceptance criterion per reopened test, as threshold, unit, direction and method, plus stop criteria with the time point and condition at which each is checked.

7. Sign-off: the person who approves the criteria signs and dates the checklist before bench work starts. A criterion changed after results are seen means a new checklist revision.

Where a covered process falls under 29 CFR 1910.119, OSHA's nonmandatory appendix says a typical change form may include "a description and the purpose of the change, the technical basis for the change, safety and health considerations", among other items (OSHA, accessed 2026); attach the checklist to that form. The editable Word checklist is at the end of this page.

Illustrative example: a completed raw material substitution checklist

The illustrative example below shows a completed raw material substitution checklist for a semi-synthetic metalworking fluid concentrate; every value in it is illustrative, not data from a real product. The outgoing material is a triethanolamine grade, CAS 102-71-6, at 8.0 wt% as delivered, which its supplier will stop selling after 2027-03-31 (illustrative).

Section 2 lists two jobs: setting the pH of a 5 % dilution at 9.2, and neutralizing the fatty acid package into an amine soap that keeps the concentrate clear (illustrative values). Section 3 compares Candidate A, the same CAS number from a second supplier at 99.5 % active, dosed at 7.96 wt%, with Candidate B, monoisopropanolamine, CAS 78-96-6, which needs a fresh dose calculation from a titration because its molar mass differs (illustrative). Section 4 marks Candidate A as pass and Candidate B as caution, because a different amine may change soap clarity and odor. Section 5 reopens pH, concentrate clarity, emulsion stability, the ferrous corrosion test in the existing specification and a 3-month stability check at 40 °C (illustrative); the SDS is reviewed because Candidate B has its own hazard classification.

The decisive row is the stop criterion: in this illustrative case, any visible layer after 24 h at 5 °C ends the trial for that candidate, whatever the other results show.

When does a raw material substitution checklist not fit?

A raw material substitution checklist does not fit a new formulation, a change to several raw materials at once, or a substitution whose safety review needs a hazard analysis rather than a checklist. A new product starts from unmet customer requirements, not from the function of one outgoing material, so it needs a formulation brief. Changing two or more materials together makes it impossible to tell which one caused a result, so split the change or treat it as a new design with its own run matrix.

The checklist also does not replace your own change control. It feeds the management of change procedure in a covered US process, the classification evaluation for a hazardous mixture in the EU, and the change process in your quality management system. If your system is certified, check which edition your certification body audits against: ISO 9001:2026, the sixth edition, was published in September 2026 and replaced ISO 9001:2015, and certified organizations transition within the timeframe set by their certification cycle (ISO, 2026). The checklist does not decide whether a substitute is safe to handle; that comes from the SDS and your own safety review.

Lubinpla handles a raw material substitution in the same order, starting from the function the outgoing material serves and why it leaves, then substitute candidates and the revalidation scope, and returns bench candidates and a trial plan for review, not a production formula. A substitution that changes the product's performance claims belongs in a customer discussion before any checklist is signed.