| Supplier Identity and Manufacturing Capability | - Legal entity and factory address
- Manufacturing process flow
- Production capacity and quality-control plan
- Recent factory audit report
| - Document review and video or on-site audit
- Verify that the audited facility matches the production location
- Review batch traceability and complaint records
| ISO 9001 quality-management principles; supplier-audit procedures based on documented quality systems | High priority
The supplier should be able to link raw materials, processing records, laboratory results, and finished-goods batches. | Unapproved subcontracting, inconsistent material grades, weak traceability, and difficulty performing corrective actions. |
| TPU Grade and Intended Skin Contact | - Technical data sheet and product specification
- Polyether or polyester TPU designation
- Hardness, density, color, and processing range
- Statement of intended use and contact duration
| - Confirm the exact grade used in samples and mass production
- Compare supplier data with an independent laboratory report
- Review change-control procedures for formulation changes
| ISO 868 for Shore hardness; ISO 1183 for density; ISO 527 for tensile properties, where applicable | Select a grade specifically evaluated for the planned application rather than relying only on the term “skin friendly.” | A material may meet mechanical targets but still contain unsuitable additives or show poor performance during prolonged contact. |
| Biocompatibility and Skin Irritation | - Biological-evaluation reports for the finished article or representative material
- Information about colorants, plasticizers, coatings, and adhesives
- Intended contact time and contact area
| - Cytotoxicity screening when relevant
- Skin irritation and sensitization evaluation based on the use case
- Use an independent laboratory with documented methods
| ISO 10993-5, ISO 10993-10, and ISO 10993-23 may be relevant for medical-device applications; applicability depends on the final product and intended use | Application-specific
Do not transfer a test report from one product to another unless material composition, process, thickness, and contact conditions are comparable. | False confidence from generic “non-toxic” claims, unexpected irritation, or failure to support a regulated product submission. |
| Restricted Substances and Chemical Safety | - Full material declaration or restricted-substance declaration
- Safety data sheet where applicable
- Disclosure of intentionally added substances
- Recent test reports for the actual production grade
| - Screening for heavy metals, phthalates, PAHs, formaldehyde, and other substances relevant to the market
- Confirm detection limits and laboratory accreditation
- Review formulation and supplier-change controls
| EU REACH Candidate List and Annex XVII restrictions; RoHS may apply to electrical and electronic products; local chemical regulations may also apply | High priority
Requirements should be mapped to the destination market, product category, and current restricted-substance list. | Customs delays, product recalls, marketplace removal, regulatory penalties, or exposure to restricted chemicals. |
| Odor and Volatile Emissions | - Odor-control specification
- Information on residual solvents, catalysts, and processing aids
- Packaging and conditioning instructions
| - Condition samples before testing
- Conduct sensory odor assessment with a defined rating scale
- Use VOC or emissions analysis when odor is critical
| Test method should be agreed in advance; VOC methods may include chamber or thermal-desorption approaches appropriate to the product | Set a numeric internal odor limit and test samples from multiple production lots rather than approving one sample only. | Strong odor complaints, poor consumer acceptance, and possible indication of residual chemicals or incomplete processing. |
| Colorants, Coatings, and Surface Finish | - Colorant and additive declarations
- Surface-treatment details
- Migration or extractable-substance information
- Color-control tolerances
| - Test the finished colored article, not only natural resin
- Evaluate rub resistance, sweat resistance, and cleaning resistance
- Check coating adhesion and surface transfer
| ISO 105 series methods may be selected for color fastness; ISO 2409 may be considered for coating adhesion where applicable | Use the final color, coating, adhesive, and printing system in verification samples. | Dye transfer to skin or clothing, surface flaking, staining, and unexpected chemical exposure. |
| Mechanical Durability and Flex Fatigue | - Tensile strength and elongation data
- Tear strength and abrasion-resistance data
- Flexing, compression, and cyclic-use expectations
- Lot-to-lot performance history
| - Independent tensile, tear, abrasion, and flex-fatigue testing
- Test finished components at the actual thickness
- Evaluate failure mode after repeated use
| ISO 527 for tensile properties; ISO 34-1 for tear strength; ISO 4649 for abrasion resistance, where applicable | Establish minimum values based on product design, temperature, humidity, and expected service life. | Cracking, tearing, loss of elasticity, premature replacement, and increased skin exposure to broken edges or coatings. |
| Hydrolysis, Sweat, and Environmental Resistance | - Polyether or polyester TPU durability data
- Resistance to sweat, sebum, detergents, sunscreen, and disinfectants
- Recommended storage and use conditions
| - Accelerated aging in heat and humidity
- Artificial sweat and chemical-contact testing
- Post-aging checks for hardness, tackiness, cracking, odor, and appearance
| ISO 188 for accelerated heat aging; ISO 4892 series for artificial weathering where relevant; product-specific sweat methods should be defined | Risk-based
Select aging conditions that represent the destination climate and actual consumer exposure. | Sticky surfaces, discoloration, hydrolysis, loss of strength, odor generation, or increased skin irritation potential. |
| Microbial and Hygiene Considerations | - Cleaning and disinfection instructions
- Antimicrobial claims and supporting evidence
- Surface porosity and moisture-retention information
| - Evaluate cleanability and moisture retention
- Do not accept antimicrobial claims without a defined test method
- Test the finished surface after aging if hygiene is a key requirement
| ISO 22196 may be relevant for antibacterial activity on plastics and other non-porous surfaces; it does not replace safety or biocompatibility evaluation | Treat antimicrobial performance as a separate claim that requires product-specific evidence. | Misleading marketing claims, poor cleanability, microbial growth in damp conditions, or incompatibility with cleaning agents. |
| Certification and Laboratory Validity | - Complete test report with sample description and production date
- Laboratory accreditation scope
- Report number, test method, results, and conclusion
- Certificate validity and renewal status
| - Verify the report directly with the issuing laboratory when possible
- Check that the tested sample matches the supplied grade
- Confirm accreditation for the specific test
| ISO/IEC 17025 is the key competence standard for testing and calibration laboratories; certification marks must be used according to the issuing body's rules | A certificate is evidence only for its defined scope, product, model, formulation, and validity period. | Expired, altered, or irrelevant reports; failed audits; and inability to demonstrate due diligence. |
| Global Regulatory Documentation | - Destination-market compliance matrix
- Declaration of conformity where required
- Technical file or supporting dossier for regulated products
- Labeling, packaging, and traceability requirements
| - Review requirements country by country
- Confirm importer, manufacturer, and authorized-representative responsibilities
- Obtain legal or regulatory review for medical and consumer products
| Requirements vary by product and market; examples include EU REACH, EU General Product Safety Regulation, US consumer-product rules, and medical-device regulations | Build a compliance file before purchase approval and update it whenever the formulation, supplier, or manufacturing site changes. | Non-compliant labeling, blocked market entry, recalls, fines, and additional testing costs. |
| Batch Consistency and Incoming Inspection | - Certificate of analysis for each batch
- Batch numbering and retention-sample policy
- Process-control limits
- Nonconformance and corrective-action records
| - Verify hardness, color, density, dimensions, and appearance
- Perform periodic chemical screening and performance revalidation
- Compare production batches with the approved reference sample
| ISO 2859-1 may be used for attribute-based sampling plans; acceptance limits must be agreed contractually | Approve a controlled golden sample and define inspection levels, critical defects, major defects, and minor defects. | Variable softness, color, odor, surface quality, or chemical composition between shipments. |
| Change Control and Long-Term Supply | - Written notification period for formulation or process changes
- Alternative raw-material and subcontractor policy
- Requalification procedure
- Business-continuity and capacity plan
| - Include change-control clauses in the purchase agreement
- Require customer approval for critical changes
- Repeat risk-based testing after significant changes
| ISO 9001 change-control principles; additional obligations may apply to regulated products | No material, additive, colorant, adhesive, coating, or manufacturing-site change should bypass documented review. | A previously approved product may lose its performance or compliance status without the buyer knowing. |
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