Complete guide to nylon material certifications for food, medical, water, and industrial applications — FDA, EU Regulation 10/2011, NSF, WRAS, and ISO standards.
Why Material Certifications Matter in Nylon Sourcing
For engineers and procurement managers specifying nylon materials, certifications are not bureaucratic formalities — they are the legal and technical foundation that determines where your parts can be used. A nylon part that meets all mechanical requirements but lacks food-contact certification cannot legally be used in food processing equipment in the EU or US. Medical device applications require FDA device master file compatibility and ISO 10993 biocompatibility testing.
This guide provides a comprehensive overview of the certifications most relevant to nylon material selection, with practical guidance on what each means for your application.
US FDA Food Contact Regulations
The US FDA regulates food contact materials under 21 CFR (Code of Federal Regulations) Parts 174-180. For nylon, the key regulation is 21 CFR §177.1500, which establishes the conditions for safe use of nylon resins in food contact:
**21 CFR §177.1500 — Nylon Resins**:
This regulation specifies:
– Permitted nylon types (PA6, PA66, PA6/66 copolymer, PA11, PA12)
– Maximum residual monomer content
– Extraction limits (specific solvents and conditions)
– Temperature limitations for different food types
**Key Limitations**:
| Food Type | Max Temperature | Conditions |
|—|—|—|
| Aqueous foods | Up to 250°F (121°C) | Hot fill and fryable |
| Fatty foods | Up to 250°F (121°C) | With extraction limitations |
| Alcoholic beverages | Up to 150°F (66°C) | Limited extraction data |
| Dry foods | Room temperature only | No temperature restriction |
**What FDA compliance means in practice**:
– The nylon resin is FDA-compliant (21 CFR §177.1500 listed)
– Colorants and additives used must also be FDA-approved for food contact
– The part manufacturer must ensure processing conditions don’t introduce contaminants
– FDA compliance is a starting point — specific applications may require additional testing
**Not all FDA-listed nylons are equivalent** — KSAN (Korea), BASF (Ultramid), DuPont (Zytel), and DSM (Stanyl) all have FDA-listed nylon grades, but they differ in additives, processing, and extraction profiles. Always request the FDA Letters of No Objection (LONO) or Food Contact Substance Notifications (FCN) from your material supplier.
EU Regulation 10/2011 for Food Contact Plastics
The EU has the most comprehensive food contact regulation for plastics. EU Regulation 10/2011 (and its amendments) establishes:
**Dual Listing System**:
The regulation lists:
1. **Authorized monomers and starting substances** (Annex I) — the chemical building blocks
2. **Authorized additives** (Annex II) — colorants, stabilizers, plasticizers
3. **Specific Migration Limits (SMLs)** — maximum allowed migration of each substance into food
4. **Overall Migration Limit (OML)** — 60 mg/kg food for total migrants
**Nylon-Specific Requirements**:
Nylon monomers (caprolactam for PA6, adipic acid and hexamethylenediamine for PA66) are specifically listed in Annex I. However, the additives used — catalysts, antioxidants, slip agents — must individually appear in the authorized list.
**Key Compliance Points**:
| Requirement | Threshold |
|—|—|
| Overall Migration Limit (OML) | 60 mg/kg food |
| Specific Migration of caprolactam | 15 mg/kg food |
| Heavy metals | Various SMLs |
| Primary aromatic amines (PAAs) | ND (not detectable, 0.01 mg/kg) |
**Important**: EU Regulation 10/2011 requires documentation of compliance including:
– Declaration of Compliance (DoC) from the material manufacturer
– Supporting technical documentation
– Batch traceability
For imported materials, request the EU 10/2011 compliance statement with specific SML test data from an accredited laboratory.
Medical Device Applications: FDA and ISO 10993
Nylon used in medical devices requires FDA device registration and ISO 10993 biocompatibility testing:
**FDA Medical Device Regulation**:
– Class I devices: General controls, many exempt from 510(k)
– Class II devices: Require 510(k) premarket notification — must demonstrate substantial equivalence to predicate device
– Class III devices: Require PMA (premarket approval) — most rigorous review
For material suppliers, FDA Device Master File (MAF) registration allows proprietary data sharing with device manufacturers without revealing trade secrets.
**ISO 10993 Biocompatibility Testing**:
This series of standards tests material biological safety. Key tests for nylon:
| Test | Standard | What It Evaluates |
|—|—|—|
| Cytotoxicity | ISO 10993-5 | Cell death/viability in cell culture |
| Sensitization | ISO 10993-10 | Allergic reaction potential |
| Irritation | ISO 10993-10 | Skin/eye/mucosal irritation |
| Acute Systemic Toxicity | ISO 10993-11 | Toxic response to extracts |
| Pyrogenicity | ISO 10993-11 | Fever response from bacterial endotoxins |
| Implantation | ISO 10993-6 | Tissue response to implanted material |
**USP Class VI**:
For pharmaceutical and medical device applications, USP Class VI testing is often required in addition to ISO 10993. This three-tiered test (systemic injection, intracutaneous, implantation) evaluates acute systemic and local tissue response.
**Nylon’s Biocompatibility Profile**:
PA6 and PA66 have a generally favorable biocompatibility profile — routinely passing ISO 10993-5 cytotoxicity and sensitization tests. However, residual monomers (caprolactam, hexamethylenediamine) can cause issues at high extraction levels. Medical-grade nylons have tighter monomer specifications.
Water and Plumbing Certifications
For nylon in potable water and plumbing applications, regional certifications are required:
**NSF/ANSI 61 — Drinking Water System Components**:
This North American standard establishes health effects criteria for devices and components that contact drinking water. NSF 61 covers:
– Extraction testing for regulated contaminants
– Maximum contaminant levels (lead, phthalates, BPA, etc.)
– Threshold of toxicological concern (TTC) approach for non-listed substances
Nylon compounds seeking NSF 61 certification must pass extraction testing at standardized conditions. Common grades: PA66-GF for hot water plumbing, PA12 for cold water and fuel lines.
**WRAS (Water Regulations Advisory Scheme) — UK**:
WRAS approval requires materials to not contaminate water or promote microbial growth. Testing includes:
– Non-toxicity to water organisms
– Taste and odor testing
– Extraction testing for regulated substances
**KTW (Kunststoffe für Trinkwasser — Germany)**:
German drinking water certification with specific extraction limits for plasticizers, antioxidants, and colorants. More stringent than NSF 61 in some areas, particularly for plasticizer content.
**ACS (Attestation de Conformité Sanitaire — France)**:
French sanitary certification based on AFNOR standards. Requires declaration of all components and extraction testing in French-accredited laboratories.
**For international projects**: Always verify the specific regional water certification required. Many countries have their own standards that may differ significantly.
UL Flammability and Electrical Certifications
For electrical and fire safety applications:
**UL 94 Flammability Classification**:
The most common flammability standard for plastics in electrical applications:
| Rating | Test | Typical Nylon Grades |
|—|—|—|
| HB | Horizontal burn, self-extinguishing | Standard PA6, PA66 |
| V-2 | Vertical burn, 30s max after flame removal | PA66 with flame retardant |
| V-1 | Vertical burn, 30s max, no dripping | FR modified PA66 |
| V-0 | Vertical burn, 10s max, no dripping | FR PA66, FR PA6 |
| 5VA | 5V test, no burn-through | Premium FR grades |
| 5VB | 5V test, no burn-through, panel | Premium FR grades |
**Glow Wire Flammability Index (GWFI)** and **Glow Wire Ignition Temperature (GWIT)**:
More relevant for electrical components that may be heated by current:
| Property | Standard PA66 | FR PA66 |
|—|—|—|
| GWFI (850°C) | Passes at 2mm | Passes at 0.8mm |
| GWIT (775°C) | Fails | Passes at 0.8mm |
**RTI (Relative Thermal Index)**:
Underwriters Laboratories assigns RTI values indicating maximum continuous use temperature:
| Property | PA66 | PA66-GF30 | FR PA66 |
|—|—|—|—|
| RTI Electrical | 85°C | 130°C | 130°C |
| RTI Mechanical | 75°C | 130°C | 130°C |
| RTI Impact | 75°C | 130°C | 130°C |
**CTI (Comparative Tracking Index)**:
Measures resistance to electrical tracking (surface leakage under voltage). PA66 typically achieves CTI 500-600V. FR grades often reduce CTI to 250-400V. For EV applications requiring CTI >600V, special high-CTI grades are needed.
Whether you need technical guidance on selecting the right nylon grade for your specific application, or want to discuss pricing and supply options for PA6-CF, PA66-GF, or standard nylon materials, our engineering team is ready to help. Nylonplastic.com supplies industrial-grade nylon materials to manufacturers in North America, Europe, and Southeast Asia.
Get a Free Material Consultation →
Contact our technical team for nylon grade recommendations, pricing for bulk orders, or samples for testing. We supply PA6-CF carbon fiber reinforced nylon in 1.75mm and 2.85mm diameters, plus full range of PA6, PA66, PA12, and GF-reinforced grades.
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**FAQs**
**Q: What is the difference between PA6 and PA66?**
A: PA66 (nylon 66) has a higher melting point (265°C vs. 225°C) and better chemical resistance than PA6. PA6 offers better impact resistance and is more cost-effective. PA66 is preferred for high-temperature and under-hood automotive applications; PA6 is common for general engineering.
**Q: How much does glass fiber reinforcement improve nylon?**
A: Adding 30% glass fiber increases tensile strength by 100-120% (from ~80 MPa to ~170 MPa) and flexural modulus by 250-300% (from ~2.8 GPa to ~9 GPa). However, it also reduces impact resistance and increases warpage.
**Q: What is carbon fiber reinforced nylon used for?**
A: Carbon fiber reinforced nylon is used for structural components requiring high stiffness-to-weight ratio, ESD-sensitive applications (electronics packaging, fuel systems), and precision parts requiring dimensional stability. nylonplastic.com supplies PA6-CF for FDM 3D printing and injection molding applications.
**Q: How do I prevent moisture absorption problems in nylon parts?**
A: Dry nylon resin to below 0.2% moisture content before molding (4-6 hours at 80-85°C in desiccant dryer). For dimensional-critical parts, anneal after molding (1-2 hours at 120-130°C) to stabilize crystallinity. Use glass or carbon fiber reinforcement to reduce moisture-induced dimensional change by 70-80%.
**Q: Can nylon be used for food contact applications?**
A: Yes. Both PA6 and PA66 have FDA 21 CFR §177.1500 compliance for food contact. EU Regulation 10/2011 compliance requires specific compound selection with documented SML testing. Always verify specific grade compliance with your supplier.
