Advanced Validation & Characterization

Different technical functions

These terms are used for different engineering purposes:

• Characterization: measurement or analysis of material, process or part properties under defined conditions.
• Screening: comparative evaluation intended to identify trends, rank alternatives or support development decisions.
• Benchmarking: structured comparison of materials, formulations, workflows or processing conditions using an agreed basis of comparison.
• Engineering validation: evaluation of whether defined technical requirements or development objectives are met under the specified project conditions.
• Regulatory qualification or validation: a separate activity governed by the requirements applicable to the customer's final Product, intended use, manufacturing process and jurisdiction.

Characterization or engineering validation performed during material development should not automatically be interpreted as regulatory qualification of the final customer Product.

From material behaviour to workflow-dependent performance

Depending on the project, evaluation may address material and process behaviour under defined manufacturing, processing or test conditions.

• thermal behaviour, including HDT, Vicat or DMTA where applicable;
• cure behaviour and working-curve parameters, including Ec and Dp where relevant;
• rheological and flow behaviour;
• mechanical performance;
• environmental stability;
• physicochemical consistency;
• batch-to-batch comparative assessment where included in scope;
• structural or microstructural analysis;
• aging and storage-stability assessment;
• process robustness;
• workflow-dependent behaviour after printing, cleaning or post-curing;
• debinding and sintering-related behaviour where applicable; and
• other project-specific performance variables.

The applicable property, sample preparation, processing conditions, test method and interpretation framework should be selected according to the objective of the project.

Analytical and testing methods

Depending on the project and available testing route, characterization may involve methods such as:

• Dynamic Mechanical Thermal Analysis (DMTA);
• HDT and Vicat softening temperature;
• capillary or rotational rheometry;
• mechanical testing and comparative performance screening;
• Scanning Electron Microscopy (SEM);
• Transmission Electron Microscopy (TEM);
• Atomic Force Microscopy (AFM);
• Nuclear Magnetic Resonance (NMR);
• X-Ray Diffraction (XRD);
• Karl Fischer moisture analysis;
• environmental aging and stability testing; and
• other chemical, thermal, rheological, mechanical or microstructural methods required by the project scope.

Not every method is necessarily performed directly by 3Dresyns®. Depending on equipment requirements, project objectives and the required reporting framework, testing may be performed internally or through external laboratories or technical partners.

Measured values depend on how they are obtained

Technical results should be interpreted together with the conditions under which they were generated.

Where relevant, the project documentation may identify:

• sample geometry;
• sample preparation;
• material version or lot;
• printing technology;
• printer and exposure conditions;
• cleaning conditions;
• post-curing conditions;
• conditioning or environmental conditions;
• test method;
• test equipment;
• number of specimens;
• measurement conditions; and
• applicable acceptance criteria where expressly defined.

Results obtained under one set of conditions should not automatically be assumed to apply unchanged to different printers, material versions, geometries, processing conditions or test methods.

Specialized third-party testing where appropriate

Where specialized analytical equipment, particular test methods or third-party test reports are required, selected testing may be performed by external laboratories.

This may support:

• access to specialized analytical equipment;
• execution of defined test methods;
• third-party generation of selected measurement data;
• traceable test reports;
• comparative testing;
• project-specific qualification activities where appropriate; and
• engineering interpretation based on externally generated results.

The laboratory performing the test remains responsible for the testing and report it issues within its own scope.

3Dresyns® may interpret externally generated results in relation to material formulation, processing conditions, workflow requirements and project objectives.

Results must retain their technical context

Internal screening data, engineering characterization and external laboratory reports may serve different purposes and should not be treated as interchangeable without considering their methods and conditions.

An internal screening result may be appropriate for formulation development or comparative decision-making without being intended as a formal external test report.

Likewise, an external test report provides results for the submitted samples and stated conditions and should not automatically be generalized to every production batch, printer, process configuration or final customer Product.

Technical evidence integrated with engineering decisions

Advanced Validation & Characterization may support:

• Resin Customization;
• Structured Additive Manufacturing Consulting;
• Professional 3D Printing Architecture;
• material selection;
• process optimization;
• industrial implementation;
• scale-up assessment;
• comparative benchmarking; and
• investigation of technical failure modes.

Testing or characterization included within one engineering project does not automatically include every test method, additional validation activity or regulatory requirement that may subsequently become relevant.

Evaluation of development targets

Characterization and screening may be used during Resin Customization to evaluate whether a developing material is progressing toward the agreed technical objectives.

Depending on scope, this may involve mechanical, thermal, rheological, optical, chemical, curing or other relevant properties.

A development target is not automatically a contractual acceptance criterion.

If a property is intended to operate as a binding acceptance criterion, the applicable project documentation should define the relevant property, target or tolerance, test method and conditions where appropriate.

Connecting material data with process behaviour

Characterization may support investigation of interactions between:

• material formulation or material version;
• printer architecture;
• wavelength and irradiance;
• exposure conditions;
• layer thickness;
• part geometry;
• cleaning;
• post-curing;
• debinding;
• sintering;
• environmental exposure; and
• final measured properties.

The purpose is to support technically informed process decisions rather than interpret a material property in isolation from the manufacturing workflow.

Evidence must be interpreted within the defined system

Characterization may support evaluation of repeatability, variability or reproducibility where these objectives are included in the project scope.

However, demonstrated performance under one controlled set of conditions does not guarantee identical results under every customer environment.

Relevant sources of variation may include:

• printer condition;
• light-source output;
• material version or lot;
• temperature;
• geometry;
• operator-controlled steps;
• cleaning;
• post-processing;
• post-curing;
• test preparation;
• test equipment; and
• manufacturing scale.

When Characterization Is Useful

• comparison of candidate materials before implementation;
• evaluation of custom material development targets;
• interpretation of mechanical, thermal or rheological behaviour;
• investigation of workflow-dependent performance;
• support for customer-specific technical documentation;
• investigation of failure modes, instability or unexpected behaviour;
• comparison of processing conditions;
• assessment of scale-sensitive variables;
• technical support for production-readiness decisions; and
• generation of defined engineering evidence for project decisions.

Engineering evidence is not automatic regulatory qualification

Characterization and engineering validation may be used in projects involving medical, dental, food-contact, pharmaceutical-related or other regulated applications where relevant to the agreed scope.

Such work does not by itself constitute regulatory certification, conformity assessment, notified-body approval, medical-device classification, market authorization or validation of the customer's final Product.

The customer or other legally responsible economic operator remains responsible for determining the regulatory requirements applicable to the final Product and intended use.

Where a particular regulatory test, laboratory status, standard, protocol or report format is required, that requirement should be identified before testing so that the appropriate testing route can be evaluated.

Testing reflects the samples received

Where characterization is performed on customer-supplied samples, the customer is responsible for accurately identifying the samples and providing relevant information concerning their preparation, processing and intended purpose.

Results obtained from customer-supplied specimens apply to the tested specimens and stated conditions and should not automatically be extrapolated to other materials, lots, geometries, processes or production conditions.

Data and engineering interpretation are different outputs

A test result provides measured or observed data under specified conditions.

Where included in scope, 3Dresyns® may additionally provide engineering interpretation concerning material behaviour, processing, comparison with alternatives, potential failure mechanisms or implications for subsequent development.

Such interpretation is based on the available information and should be considered together with the limitations of the test method and project conditions.

Characterization does not transfer underlying proprietary technology

Testing, characterization or delivery of results does not automatically disclose or transfer 3Dresyns® confidential formulations, chemical compositions, synthesis routes, manufacturing methods, internal development tools, trade secrets or other Background Intellectual Property.

The customer's pre-existing samples, designs, specifications, data and Background Intellectual Property remain subject to the customer's applicable rights.

Project-generated reports, datasets, interpretations and other deliverables are governed by the applicable project agreement or commercial scope.

Characterization of a customer's Product or invention does not by itself give 3Dresyns® ownership of that independent customer Product or invention.

Controlled handling of technical information

Projects involving non-public samples, data or technical information may be conducted under the applicable confidentiality framework or NDA.

Where external testing is required, necessary information or samples may be provided to the applicable external laboratory or technical service provider for the defined project purpose, subject to the applicable contractual and confidentiality framework.

Validation does not replace final qualification

Characterization and engineering-validation data support technical decisions under defined conditions.

They do not automatically certify or qualify final parts, medical devices, dental devices, pharmaceutical products, food-contact products or other regulated products.

They also do not automatically demonstrate:

• regulatory compliance of the final Product;
• certification;
• market authorization;
• fitness for every intended application;
• performance under every printer or process configuration;
• production-scale reproducibility;
• freedom to operate;
• commercial success; or
• achievement of specifications not expressly included in the applicable project scope.

Final validation of the customer's Product, manufacturing process and intended application remains the responsibility of the customer or other legally responsible party.

Testing services do not create inspection or audit rights

Engagement of Advanced Validation & Characterization does not grant customers, consultants, private auditors, certification bodies, notified bodies acting for customers or other private third parties any right to access, inspect or audit 3Dresyns® facilities, laboratories, manufacturing areas, internal systems, testing resources, development tools or confidential operations.

Relevant results and agreed project documentation are provided according to the applicable project scope.