EHEDG hygienic design standards are a set of voluntary guidelines and a certification scheme created by the European Hygienic Engineering & Design Group to help food processing equipment stay clean, safe, and free from microbial contamination. Following these standards can reduce cleaning downtime, lower contamination risk, and make it easier to sell equipment into EU and global food manufacturing markets.
Here is the uncomfortable truth most procurement teams learn too late: a supplier logo that says “EHEDG certified” does not automatically mean the machine will pass your audit. The certification covers only the exact configuration and orientation that was tested. Buy a different size, mount it vertically instead of horizontally, or connect it to a poorly designed CIP circuit, and the certificate may no longer apply. That is why buyers who understand the standards themselves consistently get better equipment and fewer audit surprises.
In this guide, you will learn what EHEDG is, which guideline documents matter most, the ten core hygienic design principles, how certification actually works, and how to specify equipment that meets the standards. We will also look at how EHEDG compares to 3-A and NSF/ANSI, and how turnkey production lines can be engineered with these principles from the start.
Key Takeaways
- EHEDG produces voluntary hygienic design guidelines as well as a product certification program, but EHEDG’s guidelines are not mandatory regulations.
- The four most important design guidelines include Doc 8 (General criteria), Doc 2 (Cleanability tests), Doc 13 (Open equipment), and Doc 44 (Belt conveyors).
- Ten core principles cover cleanability, surface finish, drainability, corner radii, materials, welds, seals, fasteners, hollow sections, and separation of product and technical zones.
- Certification is configuration-specific and orientation-specific; it is not a substitute for your own CIP validation.
- Equipment built with 316L stainless steel, polished surfaces, sloped frames, and IP69K motors can be aligned with EHEDG requirements from the design phase.
What Are EHEDG Hygienic Design Standards?
EHEDG means European Hygienic Engineering & Design Group. It is a non-profit consortium founded in 1989 that brings together equipment manufacturers, food companies, research institutes, universities, and public health authorities. Its purpose is to improve food safety and quality by publishing guidance on the hygienic engineering and design of food processing equipment.
The organization produces two things buyers care about most:
- Guideline documents that explain how to design, build, install, and clean food processing equipment.
- A certification scheme that lets manufacturers prove a specific product configuration meets EHEDG cleanability requirements.
EHEDG guidelines are voluntary, not legal requirements. However, they are widely referenced in procurement specifications, third-party audits, and food safety certification schemes such as BRC, SQF, and IFS. If you export equipment to Europe or supply EU-headquartered food manufacturers, you will almost certainly encounter EHEDG requirements.
Want to see how this applies to a complete line? Explore our turnkey food production lines built for global hygiene standards.
EHEDG vs Regulatory Requirements: What Buyers Must Know
A common misunderstanding is that EHEDG certification is a legal passport into the EU market. It is not. The real regulatory landscape includes separate rules that EHEDG guidelines help you satisfy.
Where EHEDG Fits
- EC 1935/2004 governs materials in contact with food.
- Machinery Directive 2006/42/EC requires food machinery to be safe and hygienic.
- EN 1672-2 and ISO 14159 define hygiene requirements for food machinery.
- FDA 21 CFR Part 117 / FSMA applies in the United States.
EHEDG guidelines provide practical engineering detail that helps manufacturers meet the intent of these regulations. Auditors often use them as a benchmark because they translate broad legal requirements into concrete design rules.
Why Buyers Reference EHEDG Anyway
When a dairy processor in Germany or a snack producer in the Netherlands writes a purchase specification, they often include language like “equipment shall be designed and constructed according to EHEDG guidelines.” They do this because EHEDG gives them a ready-made engineering standard they can verify during factory acceptance tests. It shifts risk from the buyer to the supplier.
Mini-story: When Lars, a QA manager at a Danish dairy plant, audited a new filling line in 2024, he found the supplier had stamped “EHEDG aligned” on every datasheet. But the frames had open hollow sections, and the drain slopes were below 2 degrees. The equipment had never been tested. Lars rejected the line and delayed launch by eleven weeks while the supplier rebuilt the frames. The logo alone was worthless without the engineering behind it.
Key EHEDG Hygienic Design Standards Guideline Documents
EHEDG provides many guidelines documents – over 40 altogether. But only a few are really important to machinery buyers and designers.
Doc 8, Hygienic Equipment Design Criteria
This is the core document. It defines general hygienic design requirements for closed and open food processing equipment. If you read only one EHEDG document, make it this one.
Doc 2, Method for Assessing the In-Place Cleanability of Food Processing Equipment
Doc 2 describes the microbiological test used to prove cleanability. Equipment is contaminated with bacteria such as Enterococcus faecium, run through a standardized CIP protocol, and then checked for residual contamination against a reference pipe.
Doc 13, Hygienic Design of Equipment for Open Processing
Open equipment cannot be CIP tested in the same way as closed pipework. Doc 13 covers design principles for mixers, hoppers, conveyors, and other open processes where operators need direct access.
Doc 44, Hygienic Design of Belt Conveyors
Conveyors are everywhere in snack, bakery, and protein bar plants. Doc 44 gives specific guidance on belt materials, frame geometry, cleaning access, and drainage.
Doc 32, Materials of Construction for Food Contact Equipment
This document covers stainless steel grades, plastics, elastomers, and coatings. It helps engineers choose materials that are corrosion-resistant, non-toxic, and compatible with products and cleaning chemicals.
Doc 48, Elastomeric Seals
Seals and gaskets are common contamination traps. Doc 48 explains how to design seal grooves and select elastomers so they remain flush with adjacent surfaces and can withstand CIP temperatures and chemicals.
10 Core EHEDG Hygienic Design Standards and Principles
Here are ten key design guidelines principles found in EHEDG documents. Use them as a checklist when evaluating equipment.
1. Cleanability
All product-contact surfaces and splash zones must be accessible for cleaning, either manually or through CIP. Dead spaces, blind corners, crevices, and recessed areas allow product residue and microbes to hide.
2. Surface Finish
Product-contact surfaces should be smooth enough to clean. The commonly cited target is Ra ≤ 0.8 µm for stainless steel product-contact surfaces. Pharma or aseptic applications may require even smoother finishes.
3. Self-Draining Design
Equipment and pipework must drain completely. Horizontal surfaces should be avoided. Sloped surfaces should drain away from the product zone, often at a minimum of 3 degrees.
4. Corner Radii
Internal corners should have a radius of at least 3 mm, preferably 6 mm or more. Sharp 90-degree corners are difficult to clean and create stress concentrations.
5. Materials of Construction
Materials must be non-toxic, non-absorbent, corrosion-resistant, and mechanically stable. 316L stainless steel is the default choice for product-contact parts because it resists chlorides and acidic cleaning agents. Plastics and elastomers must be food-grade and chemically compatible.
6. Crevice-Free Welds
Welds should be smooth, continuous, and free from cracks, pores, and undercut. Internal welds are often ground flush and polished to match surrounding surface finishes.
7. Proper Seals and Gaskets
Seals must sit flush with adjacent materials so no product can become trapped behind them. Metal-to-metal joints other than welding are generally discouraged because they create crevices.
8. Avoid Screw Threads in Product Zones
Screw threads are impossible to clean effectively. Fasteners should be kept out of product zones. Where unavoidable, use hygienic-type fasteners that are smooth, captive, and flush-mounted.
9. Sealed Hollow Sections
Frames, legs, rollers, and housings must be sealed or fully open. Unsealed hollow sections trap moisture and microbes. Sealed sections should use welded stainless-steel cladding.
10. Separation of Product and Technical Zones
Drives, cables, switches, and controls should be separated from the product zone. In wet environments, electrical enclosures often need IP69K protection to withstand high-pressure, high-temperature washdowns.
EHEDG Hygienic Design Standards Certification Types Explained
EHEDG certification is voluntary, but it gives buyers documented proof that a specific product has been reviewed and tested. Understanding the categories helps you ask suppliers the right questions.
Type EL: Liquid-Cleaned Equipment
Type EL covers equipment cleaned with liquids, usually through CIP.
- EL Class I: Can be cleaned in place without dismantling.
- EL Class II: Must be dismantled for cleaning.
- EL Aseptic: For aseptic applications; must be sterilizable in place (SIP).
- EL Aseptic-A: Highest level for UHT and high-care aseptic processing.
- EL AUX: Auxiliary equipment that cannot be dismantled for cleaning.
Type ED: Dry-Cleaned Equipment
Type ED covers equipment cleaned dry, such as equipment handling powders, grains, or dry snacks.
- ED Class I: Can be cleaned in place.
- ED Class II: Must be dismantled for cleaning.
The Certification Process
- Design review by an EHEDG Authorized Evaluation Officer (AEO), comparing samples and drawings against EHEDG guidelines.
- CIP testing for closed liquid-cleaned equipment, typically at least three tests under EHEDG Doc 2.
- File review by one or more additional AEOs. Open or dry-cleaned equipment requires review by all AEOs.
- Certificate issuance with equipment name, type, sizes, seal materials, supplier, certification type, and expiration date.
According to EHEDG’s official certification page, the initial certificate fee is 500 EUR and the annual prolongation is 150 EUR. Certificates are valid for one year and require renewal every five years.
EHEDG vs 3-A vs NSF/ANSI: Which Standard Do You Need?
Buyers often wonder whether EHEDG is enough, or whether they also need 3-A or NSF/ANSI certification. The answer depends on your target market and application.
| Aspect | EHEDG | 3-A Sanitary Standards | NSF/ANSI |
|---|---|---|---|
| Origin | Europe | United States | United States |
| Focus | Hygienic engineering and cleanability validation | Sanitary design for dairy, food, and beverage equipment | Food equipment materials, design, and sanitation |
| Certification approach | Design review + microbiological CIP test | Third-party verification (TPV) + use of 3-A Symbol | Third-party testing, design review, factory audits |
| Typical buyers | EU retailers, global exporters, high-care processors | North American dairy, beverage, and liquid food processors | Commercial kitchens, food-service chains, institutional buyers |
| Surface finish target | Ra ≤ 0.8 µm | Ra ≤ 0.8 µm | Varies by standard |
| Best for | EU market access and documented cleanability proof | North American dairy and liquid food processing | Commercial food-service equipment and food-contact materials |
Many global suppliers hold multiple certifications to cover different markets. For example, a pump manufacturer might seek both EHEDG and 3-A certification so the same product can be sold in Europe and North America without redesign.
Mini-story: Maria runs export sales for a snack equipment company in China. In 2023, her EU distributor began losing bids because competitors had EHEDG certificates. Maria’s company redesigned their extrusion line frames with sealed hollow legs, sloped surfaces, and IP69K motors, then worked with an EHEDG Authorized Test Laboratory. Within eight months they had EL Class I certification. The next year, their EU revenue grew by 34 percent because procurement teams stopped treating them as a risky alternative.
What EHEDG Certification Does NOT Mean
This is the section many suppliers skip, and it is exactly where buyers get burned. EHEDG certification has clear limits.
Configuration-Specific
The certificate applies only to the exact sizes, seal materials, and configurations that were tested. A certificate for a 50 mm valve does not cover the 80 mm version. A certificate with EPDM seals does not cover PTFE seals.
Orientation-Specific
Equipment tested in a horizontal orientation may not be certified for vertical mounting. If your installation differs from the test setup, the certificate may not be valid.
Not a Substitute for CIP Validation
EHEDG certification proves the equipment can be cleaned under standardized test conditions. It does not prove your specific CIP protocol works in your plant with your product and your water chemistry. You still need to validate your own cleaning process.
Installation Conditions Matter
Poor installation can defeat good design. Dead legs in connecting pipework, incorrect slopes, or inaccessible areas created during installation can make even certified equipment uncleanable.
As HygienicValve.com notes, the safest approach is to check the certificate, not the datasheet claim, and to validate your own CIP protocol.
How to Specify EHEDG-Aligned Food Production Equipment
Use this checklist when writing specifications or evaluating supplier proposals.
- Request the actual certificate, not just a logo. Confirm the certificate number, issue date, and expiration date.
- Match the purchased configuration to the certified configuration, including sizes, materials, and seal grades.
- Define product zones, splash zones, and technical zones clearly in your specification.
- Specify surface finish requirements for product-contact surfaces, typically Ra ≤ 0.8 µm.
- Require material certificates for stainless steel and elastomers.
- Document weld procedures and require inspection records.
- Plan CIP or SIP validation early so the equipment can be tested under real process conditions.
- Include drainability and cleanability review in factory acceptance testing.
How Shandong Loyal Builds EHEDG-Aligned Production Lines
At Shandong Loyal Industrial Co., Ltd., we design and manufacture turnkey food production lines for snack, pasta, protein bar, and bread crumb manufacturers around the world. Our equipment can be engineered with EHEDG-aligned hygienic design from the start.
Material and Surface Choices
We use 316L stainless steel for product-contact surfaces and specify polished finishes that meet common hygienic roughness targets. Frames and supports are designed to avoid open hollow sections and moisture traps.
Drainability and Geometry
Our hoppers, conveyors, and processing vessels are designed with sloped surfaces and rounded corners to support complete drainage. We avoid horizontal shelves and sharp internal angles in product zones.
Technical Zone Separation
Drives, electrical enclosures, and control boxes are separated from product zones. In wet processing areas, we specify IP69K gear motors and washdown-rated components.
Customization for Target Markets
Whether your primary market is the EU, North America, or Asia-Pacific, we can configure equipment to align with the standards your customers require. That may mean EHEDG-oriented design, 3-A-compatible fabrication, or CE-certified foundations.
If your focus is snack production, explore our snack food machinery designed for high-output, hygienic operations. For pasta or macaroni projects, see our pasta production line options. We also build dedicated protein bar production lines and bread crumb production lines.
Ready to discuss your project? Contact our team for a customized production line proposal.
Visual Learning: Hygienic Design in Conveyors
Conveyors are one of the most common pieces of equipment in food plants, and they illustrate many EHEDG principles. The webinar below from Intralox and Commercial Food Sanitation explains how proactive hygienic design in conveyor systems improves food safety, quality, and sustainability.
Conclusion
EHEDG hygienic design standards give food machinery buyers a practical framework for evaluating equipment cleanability and safety. The guidelines are voluntary, but they have become a procurement benchmark in Europe and beyond because they translate broad food safety goals into specific engineering requirements.
The most important things to remember are:
- Use Doc 8 as your starting point for EHEDG hygienic design standards and equipment design criteria.
- Apply the ten core principles as a checklist during specification and acceptance.
- Treat certification as configuration-specific proof, not a blanket guarantee.
- Validate your own CIP process regardless of what the certificate says.
- Choose materials, finishes, and geometries that support cleanability from day one.
Mini-story: When Ahmed upgraded his protein bar line in 2025, he started by sending suppliers a one-page checklist based on EHEDG Doc 8. One supplier returned a proposal with sealed frames, 316L contact parts, and a clear CIP plan. The other sent a standard catalog machine with a logo pasted on the cover. Ahmed chose the first supplier. His new line passed customer audit on the first visit and cut weekly deep-cleaning time by 40 percent.
If you are planning a new snack food machinery line, pasta production line, protein bar production line, or bread crumb production line, start the hygiene conversation early. The right design choices at the beginning save months of rework later. Contact Shandong Loyal today to discuss how we can build a production line that meets your market’s hygienic standards and your production goals.
