IP protection ratings (EN 60529)
What is an IP rating?
The IP (Ingress Protection) code classifies the degree of protection provided by an enclosure against solid objects (dust) and liquids (water). The code consists of two digits: the first indicates solid particle protection (0–6), the second indicates liquid ingress protection (0–9). Example: IP65 means “dust-tight” and “protected against water jets.”
| IP rating | Solid protection | Liquid protection | Typical application |
|---|---|---|---|
| IP20 | Fingers (>12.5 mm) | None | Indoor electronics, LED drivers |
| IP44 | Wires (>1 mm) | Splashing water | Indoor/covered outdoor fixtures |
| IP54 | Dust-protected | Splashing water | Industrial control panels |
| IP65 | Dust-tight | Water jets | Outdoor signage, LED lightboxes |
| IP67 | Dust-tight | Temporary immersion | Outdoor ground-level equipment |
| IP69K | Dust-tight | High-pressure hot water | Food processing equipment |
Achieving IP ratings with plastic enclosures
IP65+ ratings require careful attention to sealing: gaskets (EPDM, silicone, or closed-cell foam), precision-machined mating surfaces, and appropriate cable glands. At PlexiSystem, we CNC-machine gasket grooves directly into enclosure panels for consistent seal compression. The choice of joining technique also affects achievable IP ratings — solvent-cemented joints provide inherent watertightness.
Fire classification
UL 94 (US standard)
UL 94 is the most widely referenced flammability standard for plastic materials. It classifies materials based on their burning behavior in standardized tests.
| UL 94 rating | Description | Common plastics |
|---|---|---|
| HB | Slow burning (horizontal burn, ≤76 mm/min for <3 mm) | Standard PMMA, HIPS, ABS |
| V-2 | Self-extinguishing, flaming drips allowed | Some PC grades, FR-ABS |
| V-1 | Self-extinguishing within 30 s, no flaming drips | FR-PC, FR-PET |
| V-0 | Self-extinguishing within 10 s, no flaming drips | FR-PC, FR-PC/ABS, PEEK |
| 5VA/5VB | Highest rating, tested at higher flame intensity | Special FR-PC grades |
EN 13501-1 (European standard)
The European fire classification system for construction products (Euroclass) uses a letter-based system. Classes range from A1 (non-combustible) to F (no performance determined).
| Euroclass | Smoke class | Droplets class | Meaning |
|---|---|---|---|
| B | s1 (low smoke) | d0 (no droplets) | Very limited contribution to fire. Required for many public buildings. |
| C | s2 | d0 | Limited contribution to fire. Acceptable in many commercial applications. |
| D | s2 | d0 | Moderate contribution to fire. Standard PMMA typically falls here. |
| E | — | — | Acceptable reaction to fire. Many standard plastics. |
PMMA and fire requirements
Standard PMMA (acrylic glass) is classified as HB (UL 94) and typically D-s1,d0 or E (EN 13501-1). It is not self-extinguishing and burns with a clean flame. For applications requiring higher fire ratings (hospitals, public transport, schools), specify fire-retardant PMMA (e.g., Acrylicglas Resist, achieving B-s1,d0) or consider polycarbonate with FR additives.
Food contact regulations
EU Regulation 10/2011 (European Union)
EU Regulation 10/2011 governs plastic materials and articles intended to come into contact with food. Key requirements include:
- Overall migration limit (OML): maximum 10 mg/dm² of total substances migrating into food
- Specific migration limits (SML): individual substance limits (e.g., BPA ≤0.6 mg/kg)
- Positive list: only monomers and additives listed in Annex I may be used
- Declaration of compliance: manufacturers must provide a written declaration confirming compliance
FDA 21 CFR (United States)
The US Food and Drug Administration regulates food-contact materials under 21 CFR Parts 170–199. Compliance requires that the plastic resin and all additives are listed as safe for food contact. Testing requirements differ from EU regulations.
Material compliance overview
| Material | EU 10/2011 | FDA | Notes |
|---|---|---|---|
| PET-G | Yes (most grades) | Yes | Widely used for food packaging and displays |
| PMMA | Selected grades | Selected grades | Verify specific grade certification |
| HIPS | Selected grades | Selected grades | Common for food packaging (yogurt cups, etc.) |
| Polycarbonate | Restricted (BPA concerns) | Yes (with limits) | Not recommended for hot food contact |
| Foamed PVC | No | No | Not suitable for food contact |
| PP | Yes (most grades) | Yes | Excellent food-contact material |
CE marking
What is CE marking?
CE marking indicates that a product complies with applicable EU directives and regulations. It is mandatory for products sold within the European Economic Area (EEA). For plastic products, relevant directives include the Machinery Directive (2006/42/EC), Low Voltage Directive (2014/35/EU), EMC Directive (2014/30/EU), and RoHS Directive (2011/65/EU).
Plastic enclosures and components used in electrical equipment typically need to comply with multiple directives. The enclosure itself must meet the relevant material and construction requirements, while the complete product (electronics + enclosure) bears the CE mark.
REACH and RoHS compliance
REACH (EC 1907/2006)
REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulates chemical substances in the EU. Plastics manufacturers must ensure that no SVHC (Substances of Very High Concern) above 0.1% w/w are present without notification. PlexiSystem sources materials from REACH-compliant European suppliers.
RoHS (2011/65/EU)
RoHS restricts the use of specific hazardous substances in electrical and electronic equipment. Maximum concentration limits apply to lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. Relevant for plastic enclosures containing pigments or flame retardants.
ESD protection (IEC 61340)
For electronics manufacturing and handling, containers and work surfaces must provide electrostatic discharge protection. Plastics are classified by surface resistance:
| Classification | Surface resistance [Ω] | Application |
|---|---|---|
| Insulative | >10¹² | Standard plastics (not ESD-safe) |
| Static dissipative | 10&sup5;–10¹² | ESD-safe work surfaces, containers |
| Conductive | <10&sup5; | ESD-safe transport, grounding trays |
See also
- Material Guide — material certifications and compliance by type
- Containers & Organizers — food-grade and ESD container options
- Display Cases — fire and safety requirements for public spaces
- Designer’s Guide — specifying certifications in project documentation
- Technical enclosures — IP-rated plastic enclosures