What Yuanze’s laboratory checks tell a project team.
Laboratory information becomes useful when a buyer understands what is being checked and what the result applies to. Yuanze’s supplied laboratory list contains 11 physicochemical items and 11 microbiological or environmental monitoring items.
1. Physicochemical checks describe different properties.
The supplied laboratory spreadsheet lists several measurements and product-specific checks. These should not be collapsed into one statement that a product has “passed testing.” Ask which items are applicable to the formula and what the agreed specification requires.
| Group | Listed items |
|---|---|
| Physical and measurement properties | Centrifuge testing; pH; viscosity; conductivity; density; refractive index. |
| Hair-care checks | Conditioner solids content; shampoo foam height; shampoo active matter. |
| Temperature and water-related checks | Cosmetic heat/cold resistance; chlorine dioxide in water. |
For example, viscosity relates to the measured flow behaviour under stated conditions, while pH concerns a different property. A foam-height check belongs to a relevant cleansing-product discussion. Neither should be used as a substitute for a finished-product performance claim. The appropriate method and criteria should be set by the technical team.
2. Separate product checks from environmental monitoring.
| Group | Listed items |
|---|---|
| Microbiological checks | Total plate count; mold and yeast. |
| Clean-area monitoring | Settling bacteria; airborne microorganisms; airborne particles. |
| Monitoring locations and materials | Air; hands; equipment; purified water; production items; filling-area surfaces. |
The items in the second and third groups help explain the monitoring activities named in the document. They are different from a laboratory result for an identified finished-product sample. Monitoring the production environment and assessing the actual product are related quality tasks with different records.
Ask the team to explain the relevant scope rather than requesting the same set of results for every product. The spreadsheet names the activities; it does not state that all 22 items are performed on every formula, batch or order.
3. Read a result with its reference and criteria.
When reviewing an applicable report, identify the sample or batch, test date, method, stated conditions, specification and conclusion. A number without its context is difficult to interpret. For measurements influenced by test conditions, the conditions belong with the result.
- Which formula, sample or batch was tested?
- Which method and conditions were used?
- What criteria applied to the review?
- Who reviewed the result and the conclusion?
- What further action or review is required?
Use the agreed product specification to frame these questions. If a proposed ingredient, component or process changes, ask the technical team whether existing information remains applicable. Do not assume that one acceptable measurement closes all outstanding reviews.
4. Keep stability, compatibility and claims distinct.
The listed laboratory activities sit within a wider quality discussion. Stability and packaging compatibility concern the relevant product and component over appropriate conditions; a sensory review concerns the intended experience; a marketing claim needs its own support.
The Cosmetics Europe / CTFA stability guidance emphasises a product-specific programme. For your brief, identify the tests, reports and decisions needed for the proposed formula, package and intended market. Yuanze’s Quality Control page provides the published quality-process and assessment context.
Sources & further reading
Practical examples and checklists are editorial guidance. The references below support the technical background and company information.
- Yuanze — Quality Control
The published laboratory activities, quality checkpoints and assessment scope.
- Cosmetics Europe / CTFA — Guidelines on Stability Testing of Cosmetics (2004)
Background on stability studies and the formula–container combination.
Primary company source: Laboratory Testing Project List.xlsx, Sheet1, A1:B12. Empty Sheet2 and Sheet3 add no activities. English terms are editorial translations of the supplied Chinese labels.
