| Chemical identity | Contain one organic substituent attached to the nitrogen atom; the general structural form is R–NH₂. | Contain two organic substituents attached to the nitrogen atom; the general structural form is R₂NH. | Confirm the substance name, CAS Registry Number, molecular formula, and structure against the purchase specification and intended use. Check that salts, isomers, or mixtures are clearly identified. |
| Assay and purity | Request a lot-specific assay result and a defined method, such as gas chromatography where suitable for the substance. | Request a lot-specific assay result and a defined method appropriate to the substance and its impurity profile. | Set acceptance limits in the agreed specification. Review the analytical method, reporting basis, and whether the result is corrected for water or other stated components. |
| Impurity profile | Identify relevant residual starting materials, by-products, and other amines that may affect performance or safety. | Identify relevant residual starting materials, by-products, and other amines; assess impurities against the intended application. | Ask for listed impurities and limits where they matter to the process or regulatory use. Do not treat “high purity” as a substitute for a numerical, agreed specification. |
| Water content | Check water when moisture can affect handling, reaction performance, or product stability; Karl Fischer titration is a common determination method. | Check water where it can affect handling, reaction performance, or product stability; agree the test method and reporting units. | Specify a maximum water content only when required by the application, and confirm that the lot-specific certificate reports the result or an agreed test status. |
| Other physical and chemical tests | Depending on the grade, relevant checks may include appearance, color, density, boiling range, or amine value. | Depending on the grade, relevant checks may include appearance, color, density, boiling range, or amine value. | Choose tests that are meaningful for the specific substance. Compare results with the supplier’s specification and the buyer’s validated process requirements. |
| Batch consistency | Compare recent lot results for assay, key impurities, and application-critical properties. | Compare recent lot results for assay, key impurities, and application-critical properties. | Request representative lot data where appropriate, change-control information, and notice procedures for changes to raw materials, process, site, or test methods. |
| Certificate of analysis | Obtain a certificate of analysis (CoA) tied to the supplied lot, with test results, methods or references, specification limits, and release status. | Obtain a CoA tied to the supplied lot, with test results, methods or references, specification limits, and release status. | Check that the product identity and lot number on the CoA match the packaging and shipping documents. Clarify whether reported values are actual results or specification limits. |
| Safety and transport documents | Obtain a current safety data sheet (SDS) and applicable transport classification information for the exact substance and supply form. | Obtain a current SDS and applicable transport classification information for the exact substance and supply form. | Check that hazard classification, labeling, emergency information, and transport details are consistent with the relevant jurisdiction and shipment. Requirements can differ by country and transport mode. |
| Regulatory status | Confirm the substance’s applicable inventory or registration status for the destination market and intended activity. | Confirm the substance’s applicable inventory or registration status for the destination market and intended activity. | Check applicable requirements in each destination jurisdiction. For example, EU REACH obligations depend on factors including the substance, role in the supply chain, tonnage, and any applicable exemption; U.S. TSCA requirements should be checked for the specific substance and activity. |
| Intended-use suitability | Confirm that the grade and impurity controls meet the requirements of the intended process or end use. | Confirm that the grade and impurity controls meet the requirements of the intended process or end use. | Where food, pharmaceutical, cosmetic, or other regulated uses are involved, verify the applicable legal requirements and supporting evidence separately; industrial-grade material should not be assumed suitable. |
| Traceability and supply continuity | Confirm lot identification, manufacturing or distribution traceability, and retention of relevant quality records. | Confirm lot identification, manufacturing or distribution traceability, and retention of relevant quality records. | Agree record-retention, complaint handling, nonconformance notification, and change-notification expectations. Assess lead time and continuity without relying on an unverified source claim. |
| Practical sourcing decision | Approve only after identity, specification, lot documentation, and application suitability have been reviewed. | Approve only after identity, specification, lot documentation, and application suitability have been reviewed. | Use a written specification and a documented supplier qualification process. Reassess when the formulation, manufacturing site, regulatory destination, or intended use changes. |
| Note: The appropriate test limits and regulatory obligations depend on the specific amine, grade, intended use, supply-chain role, and destination market. Confirm current requirements with qualified regulatory and safety personnel before purchase or use. |