How to Write a Raw Material Specification
Finished product quality is decided at the raw material stage. A specification is how you decide it rather than discover it. Identity, assay, contaminants, methods and supplier obligations. Each line prevents a problem that otherwise arrives in a batch.
Why Raw Material Specifications Matter Most
This guide is for brand owners and small manufacturers in India specifying raw materials.
A finished product cannot be better than its inputs. Testing the finished product tells you whether a problem exists; specifying and testing the raw material prevents it from entering in the first place, which is both cheaper and more reliable.
For botanical materials this is particularly true, because the variability is large. Identity, potency, contaminant load and processing all vary between lots and between suppliers, and none of it is visible in a powder.
Many small operations have a finished product specification and accept raw materials on a supplier declaration. That arrangement means the supplier decides your product’s quality, and you find out afterwards.
Writing a specification per material takes an hour with professional input and pays for itself the first time a lot is rejected before it enters production.
The Sections
What a raw material specification should contain.
| Section | Contents |
|---|---|
| Material name | Including botanical name where applicable, and your internal code |
| Grade or type | Where several exist |
| Part used | For botanicals, explicitly |
| Form | Powder, extract, oil, with extraction ratio and solvent |
| Appearance | Described precisely |
| Odour and taste | Where relevant, against a reference sample |
| Identity | Test and method, required per lot |
| Assay | Marker or active, with limit range and method |
| Loss on drying or moisture | Maximum with method |
| Ash values | Total and acid-insoluble, where applicable |
| Particle size | Where it affects processing |
| Bulk and tapped density | Where it affects filling |
| Residual solvents | Where solvent extraction is used, with limits |
| Heavy metals | Each with a maximum |
| Microbial limits | Total counts and specified pathogens |
| Mycotoxins | Where the material warrants it |
| Pesticide residues | Scope per sourcing and market |
| Adulterant screening | Where the material is commonly adulterated |
| Packaging and storage | How it must arrive and be stored |
| Retest or expiry period | With storage conditions |
| Documentation required | Per lot |
| Version control | Number, date, signatures |
Bulk and tapped density is the line most often omitted and it causes real production problems, because a material at a different density fills differently and can make a validated process produce out-of-weight units.
Writing Each Line Properly
The discipline that makes it usable.
Every Parameter Gets a Method
A limit without a method is not enforceable, because the result depends on how it was measured. Name the method or the standard it follows.
Every Limit Has a Direction
Maximum, minimum or a range. Stating a figure without saying which leaves it ambiguous.
Specify Per Lot, Not Per Supplier
Identity and contaminant testing should be required on every lot, since variation is between lots, not between relationships.
Make Limits Achievable
Discuss them with the supplier. A limit the material cannot meet produces either constant rejections or a specification everyone ignores.
Where you require a test on every lot, say so explicitly in the document. A specification that lists a parameter without stating the frequency invites periodic testing, which is not the same control.
Supplier Obligations to Include
Beyond the technical parameters.
- A certificate of analysis per lot, with every specified parameter, actual figures and methods named.
- The testing laboratory named, with accreditation confirmed for the methods used.
- Notification before any change to the source, process or specification.
- A retention sample held by the supplier, for a stated period.
- The right to audit or to request additional testing.
- Packaging and labelling requirements for incoming material, including lot number.
- Transport and storage conditions during delivery.
- A stated response process if a lot is rejected.
- Confirmation of allergen status and the facility’s allergen controls.
- Confirmation of vegetarian, vegan, halal or other status where you make such claims.
- Country of origin, where it matters for your market or claims.
Using the Specification
A document nobody checks against is decoration.
On each delivery, check the lot’s certificate of analysis against the specification line by line: every parameter present, every method as specified, every result within limits, actual figures rather than compliance statements.
Keep a record per lot of the figures received. Over several lots this shows you the supplier’s actual variability, which is more informative than any single certificate and tells you whether your limits are set sensibly.
Where you commission your own verification testing, decide which parameters and at what frequency, and base that on risk rather than testing everything or nothing. Identity and the parameters that matter most to your product are the usual priorities.
And review the specification periodically. A specification written at launch may not reflect what you have learned about the material two years later.
Checklist
Per raw material.
- Name the material including botanical name and part used.
- State grade, form, extraction ratio and solvent where applicable.
- Describe appearance, odour and taste against a reference sample.
- Require identity testing per lot with the method named.
- Specify assay with a limit range and method.
- Specify moisture, ash and particle size as applicable.
- Specify bulk and tapped density where filling depends on it.
- Specify residual solvent limits where extracted.
- Specify heavy metal maximums and microbial limits with pathogens.
- Add mycotoxin and pesticide scope appropriate to the material.
- Add adulterant screening where the material is commonly adulterated.
- State testing frequency explicitly, per lot where required.
- State packaging, storage, retest period and conditions.
- List the documentation required per lot.
- Include supplier obligations, including change notification and retention samples.
- Discuss achievability with the supplier before finalising.
- Version, date and have both parties sign it.
- Check every incoming lot’s certificate against it, line by line.
- Record the figures per lot and review variability periodically.
Want Raw Material Documentation You Can Check?
Ask our team for a sample raw material specification and certificate of analysis before you place a first order.
Frequently Asked Questions
Why specify raw materials rather than just test finished product?
Because finished product testing tells you a problem exists, while raw material specification prevents it entering. A rejected raw material lot costs a delivery; a rejected finished batch costs the batch.
What is most often omitted?
Bulk and tapped density, which causes real production problems because material at a different density fills differently and can make a validated process produce out-of-weight units.
Should testing be per lot or periodic?
Per lot for identity and contaminants, because variation is between lots rather than between supplier relationships. State the frequency explicitly in the document, since a parameter listed without a frequency invites periodic testing.
What supplier obligations belong in it?
A certificate of analysis per lot with actual figures and named methods, the laboratory named and accredited, notification before any source or process change, a retention sample held for a stated period, audit rights, and allergen and claim status confirmations.
How do I use the specification in practice?
Check each lot’s certificate against it line by line, and keep a record of the figures received. Over several lots that shows the supplier’s actual variability, which tells you whether your limits are set sensibly and is more informative than any single certificate.