| 1 |
Material identity |
Stoichiometric hydroxyapatite is commonly represented as Ca10(PO4)6(OH)2. |
Chemical formula, phase identification, product grade, and intended use. |
| 2 |
Calcium-to-phosphorus ratio |
The theoretical atomic Ca/P ratio is 10:6, or approximately 1.67. |
Lot-specific Ca/P testing method, acceptance range, and certificate of analysis. |
| 3 |
Elemental composition |
Ideal stoichiometric hydroxyapatite contains approximately 39.9% calcium and 18.5% phosphorus by mass; the balance is mainly oxygen and hydrogen. |
Elemental assay results and declared limits for impurities and residual ions. |
| 4 |
Crystal phase |
Hydroxyapatite can coexist with secondary calcium-phosphate phases if synthesis or heat treatment is not tightly controlled. |
X-ray diffraction pattern, phase identification, and quantitative phase-purity data. |
| 5 |
Crystallinity |
Higher crystallinity generally corresponds to slower dissolution, while lower-crystallinity material generally dissolves more readily. The desired level depends on the application. |
Crystallinity measurement, heat-treatment history, and dissolution or resorption data. |
| 6 |
Particle-size distribution |
Particle size affects handling, packing, surface area, fluid penetration, and the rate of material dissolution. |
D10, D50, D90 values, measurement technique, agglomeration status, and sieve or laser-diffraction results. |
| 7 |
Porosity and morphology |
Granular, porous, dense, and scaffold forms provide different handling and fluid-access characteristics. |
Total porosity, pore-size distribution, morphology images, and bulk or tapped density. |
| 8 |
Source materials |
Synthetic hydroxyapatite is produced from controlled chemical precursors rather than relying on animal-derived mineral. |
Precursor specifications, animal-origin statement, allergen statement, and traceability records. |
| 9 |
Biological safety |
Implantable materials require risk-based biological evaluation appropriate to the finished device and its intended contact. |
Biocompatibility test reports, risk-management documentation, and extractables or leachables information where applicable. |
| 10 |
Heavy metals and impurities |
Trace contaminants can affect safety, regulatory acceptance, and batch consistency. |
Limits and test results for lead, cadmium, mercury, arsenic, residual solvents, and other process-related impurities. |
| 11 |
Sterility and packaging |
Sterility is a property of the finished packaged product and the validated sterilization process, not simply the raw powder. |
Sterilization method, sterility assurance information, packaging validation, shelf life, and storage conditions. |
| 12 |
Quality-system capability |
Medical-device supply requires documented manufacturing controls, change control, deviation management, and lot traceability. |
Applicable quality certifications, audit availability, process validation, change-notification policy, and complaint handling. |
| 13 |
Regulatory documentation |
Regulatory requirements differ by country, product classification, intended use, and whether the material is supplied as a raw ingredient or finished graft. |
Technical file support, intended-use statement, regulatory status, conformity documentation, and post-market support. |
| 14 |
Batch consistency |
Consistent Ca/P ratio, phase composition, particle size, moisture, and impurity profile are essential for reproducible performance. |
Three or more recent batch certificates, statistical trend data, sampling plan, and out-of-specification procedure. |
| 15 |
Commercial suitability |
The most suitable supplier is determined by technical fit, documentation, capacity, lead time, and total cost rather than price alone. |
Minimum order quantity, scale-up capacity, lead time, forecast flexibility, technical support, and total landed cost. |