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Understanding USP Class : What it means for plastics in the medical industry

Key-takeaways:

  • United States Pharmacopeia (USP) Class plastics evaluate the biological safety of materials used in medical applications
  • USP Class VI represents one of the highest levels of biological testing for plastics
  • USP classifications focus on raw materials, while Food and Drug Administration (FDA) and European Union Medical Device Regulation (EU MDR) classes focus on final medical devices
  • In Europe, International Organization for Standardization (ISO) 10993 and EU MDR are the primary frameworks for medical material and device validation
  • For 3D printed medical applications, compliance depends on both the material and the full production workflow
  • Sculpteo supports medical innovation with validated materials such as PA12, PA11, and PP
  • Material validation alone is not enough: manufacturing processes, traceability, and application context are equally important

    Introduction

    In the medical industry, material selection is not just a technical decision, it is a critical factor that directly impacts patient safety, regulatory compliance, and product performance. Among the frameworks used to evaluate materials, USP class plastics play an important role in assessing how plastics behave in medical environments.

    As healthcare technologies continue to evolve, particularly with the rise of 3D printing for medical devices, the need for reliable and validated materials has become even more important. Engineers and manufacturers must ensure that plastics used in medical applications are not only functional, but also safe for interaction with the human body.

    For companies developing medical devices, prosthetics, orthotics, or healthcare tools, United States Pharmacopeia (USP) Class VI plastics are often seen as an important benchmark for biocompatibility. These standards, developed by the United States Pharmacopeia (USP), help manufacturers evaluate how materials behave when exposed to biological systems.

    However, one of the most common misconceptions is that USP Class VI alone guarantees medical approval. In reality, USP standards are only one part of a broader regulatory landscape that also includes:

    • Food and Drug Administration (FDA) medical device classes in the United States
    • European Union Medical Device Regulation (EU MDR) classifications in Europe
    • International Organization for Standardization (ISO) 10993 biocompatibility standards

    For manufacturers operating internationally especially in Europe, understanding the distinction between material validation and device classification is essential.

    USP Class plastics

    What are USP Class plastics?

    USP class plastics refer to materials evaluated according to standards defined by the United States Pharmacopeia (USP). These standards focus on how materials interact with biological systems, ensuring they are suitable for medical use.

    Unlike traditional material specifications that primarily address mechanical properties, USP classifications assess how plastics behave in contact with the human body. This includes evaluating biological response, toxicity risks, and compatibility with tissues or fluids.

    Each USP class corresponds to a different level of testing rigor. While USP Class VI plastics are often considered the most stringent in terms of biological evaluation, modern medical manufacturing requires a broader perspective. In practice, compliance depends not only on the material itself, but also on how it is processed and used in a final device

    USP Class vs Medical Device Class: Understanding the Difference

    Because the term “class” appears in multiple medical frameworks, confusion is common.

    USP classes apply to raw materials, while FDA or EU MDR classes apply to the finished medical device.

    Aspect EU MDR / FDA Device Classes USP Classes
    Scope Entire medical device Raw material
    Purpose Risk classification Biocompatibility testing
    Scale meaning Higher class = higher-risk device Higher class = more extensively tested material
    Highest level Class III USP Class VI
    Regulatory impact Determines legal approval pathway Supports material qualification

    This distinction is critical.

    For example, a plastic can meet USP Class VI requirements but still require extensive validation before being used in a Class II or Class III medical device.

    USP Class VI and European Standards: ISO 10993 & MDR

    For European manufacturers, International Organization for Standardization (ISO) 10993 is often more relevant than USP alone.

    Europe’s regulatory approach focuses on:

    • Intended device use
    • Duration of body contact
    • Type of tissue exposure
    • Manufacturing process

    This means that while USP standards remain valuable, European compliance often requires:

    • ISO 10993 biological evaluation
    • European Union Medical Device Regulation (EU MDR) classification
    • Full product traceability

    For companies selling internationally, combining USP, ISO, MDR awareness creates a stronger regulatory strategy.

    Sculpteo materials for medical applications

    Rather than relying on a single classification like “USP Class VI plastic,” Sculpteo focuses on high-performance polymers compatible with medical requirements, including ISO 10993 standards and skin-contact validation.

    Materials such as PA12, PA11, PP, and TPU are widely used in medical applications due to their balance of mechanical performance, flexibility, and biocompatibility.

    These materials enable the production of:

    Property Nylon PA12 (SLS or MJF) Ultrasint® PA11 (SLS or MJF) PP (Polypropylene)
    Source Petrochemical polyamide Bio-based from castor oil Petrochemical polypropylene (BASF-enabled PP)
    Printing technology SLS and MJF SLS and MJF MJF (HP Jet Fusion)
    Flexibility Rigid Flexible, impact-resistant Highly flexible, fatigue-resistant (living hinges)
    Chemical resistance Excellent Excellent Outstanding chemical resistance (acids, bases, solvents)
    Biocompatibility Yes – ISO 10993-5 (cytotoxicity), ISO 10993-10 (irritation & sensitization), USP Class I–VI Yes – ISO 10993-5, ISO 10993-10, ISO 10993-11, USP <88> muscle implantation, USP Class I–VI Yes – passed ISO 10993-5, -10, -11 tests for intact skin devices (cytotoxicity, sensitization, irritation, systemic toxicity, pyrogenicity)
    Surface finishing options Raw, polished, smoothed Raw, smoothed Raw
    Sustainability profile Conventional polymer Renewable, low-carbon alternative Conventional polymer
    MJF part
    Performance

    PA11 HP

    HP Jet Fusion Technology

    The role of biocompatibility in USP Class plastics

    At the core of USP class plastics is biocompatibility, which refers to how a material interacts with the human body.

    Biocompatibility testing evaluates whether a material can safely come into contact with:

    • Skin
    • Tissue
    • Bodily fluids

    This is especially important in:

    • Prosthetics
    • Orthotics
    • Surgical guides
    • Medical enclosures

    By combining USP standards with ISO 10993, manufacturers gain a broader understanding of both material safety and regulatory readiness.

    Material Document Title
    Ultrasint® PA11 Biocompatibility statement
    PA11 HP Biocompatibility information
    PA12 MJF Biocompatibility certificate
    PA12 SLS Regulatory information
    PP (Polypropylene) Biocompatibility certificate

    Common misconceptions about USP Class plastics

    There are several misconceptions around USP class plastics that can lead to confusion.

    One of the most common is the belief that USP classification alone guarantees regulatory approval. In reality, it is only one part of a larger validation process.

    Another misconception is that USP standards apply only to pharmaceuticals. In fact, they are highly relevant for medical devices and components, especially those involving patient contact.

    Finally, some assume that a material labeled “USP Class VI” is automatically suitable for all applications. In practice, suitability depends on the specific use case, manufacturing process, and regulatory pathway.

    Ensuring quality and compliance

    Using USP class plastics is only one part of a broader quality strategy. To ensure compliance, manufacturers must combine validated materials with controlled production processes and proper documentation.

    Standards such as ISO 13485 help structure these processes, ensuring traceability and consistency across production. This is particularly important when transitioning from prototyping to full-scale manufacturing.

    At Sculpteo, this approach translates into a focus on industrial-grade production, repeatability, and quality control, helping medical innovators bring reliable products to market.

    Conclusion

    Understanding USP class plastics is essential for developing safe and effective medical devices.

    While USP classifications provide a valuable framework, modern manufacturing requires a more comprehensive approach that considers the entire production process. By combining validated materials with advanced manufacturing technologies, companies can ensure both compliance and innovation.

    People also ask

    What are USP class plastics?

    What is USP Class VI plastic?

    Are USP class plastics required for medical devices?

    How does USP relate to ISO 10993?

    What materials does Sculpteo use for medical applications?

    Can USP class plastics be used in 3D printing?

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