| Product compatibility | Changes to the formula, container, closure, pump, liner, or decoration during contact and storage. | Fill samples with the intended formula. Keep a control sample in a compatible reference container. Inspect at the start and at agreed intervals, such as 2 and 4 weeks at room temperature and 40°C. Treat elevated-temperature storage as a screening test, not proof of shelf life. | Formula color, odor, appearance, pH or viscosity where relevant; container swelling, softening, cracking, discoloration, stress marks, and component function. | No visible damage or unacceptable change versus the control; dispensing and closure function remain acceptable. Set formula-specific limits before testing. |
| Leakage and closure integrity | Leaks at the neck, seams, pump, cap, gasket, or other closure points; unintended dispensing during handling. | Fill and close samples using the intended production method. Wipe dry, weigh, then store upright and inverted for 24 hours at room temperature. Repeat after the agreed shipping or temperature-conditioning test. Use absorbent material to help identify leaks. | Sample ID, fill weight, closure setting, orientation, test conditions, visible leakage, and weight change beyond the balance's measurement uncertainty. | No visible leakage, closure loosening, or unintended product release in the tested samples. Define the required sample count and any allowable weight change before the test. |
| Durability and handling | Resistance to cracking, denting, cap damage, label wear, and loss of function during filling, packing, and ordinary handling. | Inspect filled samples before and after a buyer-defined drop sequence on a hard surface, covering relevant orientations such as base, side, and closure. Separately test opening, closing, and dispensing for the intended use cycle count. | Drop height and surface, impact orientation, number of drops, cracks or deformation, closure condition, and dispensing performance. | No breakage, sharp fragments, leakage, or loss of required function under the agreed test conditions. Set the drop height and cycle count to match the product's expected handling. |
| Recyclability and material identification | Resin or material type for each component, separability of mixed materials, coatings, labels, pumps, liners, and other parts. | Request a component-level material list and review the full package against recycling guidance for the intended sales markets. Check whether consumers can separate components and whether labels or finishes may affect sorting or processing. | Material and resin identification for each part; component weight; separation steps; available local collection and processing guidance; supporting supplier documentation. | Materials are identified and claims are limited to what local collection and recycling systems support. Do not describe packaging as recyclable everywhere based only on its resin code. |
| Wholesale sample review | Consistency between samples and the quoted specification, including dimensions, capacity, finish, components, and packing method. | Measure several samples from the same batch. Compare them with the approved drawing or specification and confirm that the tested samples represent the proposed production configuration. | Sample quantity and batch reference; dimensions; component materials; finish; defects; specification differences; confirmation of production equivalence. | Samples match the agreed specification within its stated tolerances. Document any approved deviations before placing a wholesale order. |