A specification that says "cleanroom wiper, low particle, sealed edge" will produce five quotations for five different products, and the buyer will choose on price because the technical column is identical. The fix is not a longer document. It is a document that names a test and a number.
Start with the task, not the product
Write one sentence that describes the surface, the solvent and the acceptance requirement. For example: "Wipe for stainless steel filling surfaces, cleaned with 70% IPA, residue must not exceed 2 mg/m² after evaporation." That sentence already excludes half the market and tells the supplier which test to run.
Then list the properties that follow from it: fibre, construction, edge, size, fold, pack, sterility if required. Each one should have a reason attached, even if the reason is only "operator control". A parameter without a reason gets removed in the next cost review.
Name the method, not just the property
"Low particle" is not a specification. "Particle release tested by IEST-RP-CC004.3, liquid particle count in DI water, report particles ≥0.5 µm per square metre" is. The method tells the supplier which laboratory to use and tells you whether two results are comparable.
The same applies to absorbency, extractables and edge integrity. If you cannot name a method, you cannot compare a result, and the specification becomes a description again.
| Parameter | Method | Tolerance |
|---|---|---|
| Base weight | ISO 9073-1 or supplier method | ±5% of nominal |
| Particle release | IEST-RP-CC004.3, LPC | Report value; limit by task |
| Extractables | Solvent soak, gravimetric | ≤ agreed mg/m² |
| Edge integrity | Seal width, visual at 10× | No unsealed run >2 mm |
| Sheet count | Count per pack, three packs | ±1% of nominal |
Define the pack, because it is part of the product
Two cloths with identical fabric can behave differently on a line if one is a flat stack of 250 and the other is a bag of 100. State the pack configuration, the number of inner bags, the case count and the pallet pattern. State whether the outer carton may carry printing, because a carton that sheds ink is a contamination source in a clean corridor.
If the pack is changed, the specification should require notification. A supplier who moves from a box to a bag to save freight has changed the product, even if the cloth is the same.
Acceptance and change control
Write the acceptance rule before the first delivery: how many packs are sampled, what is measured, and what happens when a result is out. Include the retaining sample period and the documents that must arrive with each lot: certificate of analysis, lot number, and the material declaration if the site requires one.
Then write the change clause. Any change to fibre, binder, edge, converting line or packaging should trigger a notification and, for critical references, a re-qualification. Suppliers accept this when it is agreed at tender; they resist it when it appears after the first price negotiation.
A one-page template
Keep the document to a page. A short paragraph on the task and the solvent; a table of parameters with method and tolerance; a paragraph on pack configuration and labelling; a paragraph on acceptance, retention and change notification. Appendices can carry drawings and historical data.
A one-page specification gets read. A twenty-page document gets filed, and the buyer negotiates on price because nobody in the room can find the clause that would justify the difference.
Should the specification name a brand?
Only if the brand is the qualification. Otherwise name the performance and let suppliers propose. A brand-locked specification removes the competition you are trying to create.
How many references should one tender cover?
One per task family, with a qualified alternate. A tender with twelve line items produces twelve negotiations and no clear standard.
What if a supplier cannot provide test data?
That is the answer to the technical evaluation. A supplier who cannot name the method cannot be compared with one who can, and the price is not a substitute for the data.
