Ultem PEI FDA Compliance — 21 CFR, USP Class VI & NSF

Ultem 1000 (unfilled polyetherimide) meets the primary FDA, USP, and NSF compliance standards applicable to plastics used in food contact, pharmaceutical processing, and medical device applications. Its regulatory profile—combined with autoclave sterilizability to 2,000+ cycles and mechanical performance at elevated temperature—makes it one of a handful of engineering thermoplastics suitable for reusable medical devices and food-zone equipment that must withstand steam sterilization.

At a glance:

• FDA 21 CFR 177.1595: Ultem 1000 compliant for repeated food-contact use
• USP Class VI: Biocompatibility testing passed; suitable for indirect patient contact and device applications
• NSF: Listed for potable-water contact applications
• Autoclave: 2,000+ validated steam sterilization cycles at 270°F (132°C)
• Hydrolytic stability: No chain scission, no surface crazing through repeated wet-heat exposure
• Grade note: Compliance applies to Ultem 1000 (unfilled); glass-filled grades require separate documentation review

FDA 21 CFR 177.1595 — Food Contact

The U.S. Food and Drug Administration regulates the use of polymeric materials in contact with food under Title 21 of the Code of Federal Regulations. Section 177.1595 specifically covers polyetherimide (PEI) resins and defines the conditions under which Ultem can be used in repeated food-contact applications.

What the Regulation Covers

21 CFR 177.1595 establishes compositional requirements for the base resin, extractable limits under food-simulant test conditions, and temperature/contact-type limitations. Ultem 1000, as manufactured by SABIC, is compliant for food contact under the conditions specified in 177.1595, including direct contact at typical food-processing temperatures and use in steam-sterilized food-handling equipment.

Practical Applications in Food Processing

Ultem is used where conventional engineering plastics fail due to temperature or sterilization requirements:

• Portioning and dispensing equipment: Food-contact fixtures exposed to hot products (up to 300°F)
• Autoclave-sterilized food trays: Trays and cassette fixtures in cook-chill and retort processing requiring steam sterilization between runs
• Liquid handling components: Valve bodies, manifold inserts, and flow-path hardware in hot beverage and dairy systems requiring CIP or steam sterilization
• Inspection fixtures: Parts in food-safe environments where all contact surfaces require regulatory compliance

USP Class VI Biocompatibility

The United States Pharmacopeia (USP) Class VI designation is a biocompatibility standard used in medical device and pharmaceutical applications. Class VI testing includes three in-vivo animal tests:

• Systemic injection test: Aqueous and non-aqueous extracts injected systemically; no systemic toxicity observed
• Intracutaneous test: Extracts injected into skin tissue; no significant biological reactivity
• Implantation test: Material samples implanted in muscle tissue for 7 days; no significant tissue reactivity

Ultem 1000 passes all three test protocols and carries USP Class VI status. This biocompatibility designation supports its use in medical devices that contact patient tissue or body fluids indirectly, pharmaceutical processing equipment contacting drug products or packaging, and laboratory consumables used in biological research.

USP Class VI is not the same as full biocompatibility qualification under ISO 10993 (the international standard for medical device biocompatibility). For devices requiring ISO 10993 compliance—particularly implantable or long-term body-contact devices—a full ISO 10993 evaluation is required in addition to, or instead of, USP Class VI documentation.

Medical Device Applications

• Surgical instrument sterilization trays and cassettes
• Endoscope component housings and accessory handles
• Dental autoclave cassettes and instrument holders
• Drug delivery device structural components
• Diagnostic equipment parts requiring between-patient sterilization
• Laboratory consumables in contact with biological samples

For high-frequency autoclave use (clinical settings cycling trays 10–20 times daily), Ultem 1000's 2,000+ validated cycle performance provides multi-year service life under typical protocols.

NSF Certification — Potable Water Contact

NSF International's certification programs include listings for materials in contact with drinking water. Ultem holds NSF listing under applicable NSF/ANSI standards for potable water contact applications. This makes it suitable for:

• Drinking water filtration and distribution hardware
• Beverage dispensing system components
• Water treatment equipment parts

The NSF listing covers specific product forms and grades; verify that the specific Ultem form and grade you intend to use is covered under the applicable NSF/ANSI standard before finalizing the design.

Autoclave Sterilization Performance

Steam Sterilization Parameters

The standard hospital autoclave gravity cycle operates at 270°F (132°C) and 30 psi steam pressure for 15–20 minutes. Pre-vacuum (Prevac) cycles operate at the same temperature and pressure but with a pre-vacuum phase that more aggressively displaces air from complex geometries.

Ultem 1000 survives both cycle types without significant dimensional change, surface crazing, or hydrolytic degradation. SABIC's published validation data documents 2,000 full cycles with property retention well above the minimum threshold for continued functional use. For comparison:

Hydrolytic Stability Mechanism

Ultem's resistance to steam sterilization is a function of its hydrolytic stability: the ether and imide bonds in the PEI backbone resist attack by hot water in a way that ester bonds (PC, PET) and amide bonds (PA-6, PA-66) do not. Hot pressurized steam cleaves ester and amide linkages over time, reducing molecular weight and producing dimensional and mechanical degradation. Ultem's backbone chemistry is substantially more resistant to this mechanism.

Other Sterilization Methods

Beyond steam autoclave: dry-heat sterilization at 320–375°F (below Tg) is acceptable; EtO sterilization is compatible with standard degassing; gamma radiation is tolerated to approximately 25 kGy, with yellowing and minor property change possible at higher doses; e-beam is similar to gamma.

Compliance Documentation Checklist

When procuring Ultem for regulated applications, request from your distributor:

1. Certificate of Conformance (CoC): Lot-specific statement of grade, form, and compliance status
2. SABIC material datasheet: Current revision with regulatory listings
3. FDA 21 CFR 177.1595 compliance letter: For food-contact applications
4. USP Class VI test report: Available from SABIC for Ultem 1000
5. NSF certificate: For potable-water contact applications
6. Autoclave validation data: Cycles, conditions, and property retention

Keep these in your design history file per your QMS (ISO 13485 for medical devices; SQF or FSSC 22000 for food manufacturing).

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