Anti-fog wide vision safety goggles for construction, laboratory, and industrial operatives requiring EN166 certified protection against liquid splash, dust, and gas in demanding environments.
Anti-fog wide vision safety goggles for construction, laboratory, and industrial operatives requiring EN166 certified protection against liquid splash, dust, and gas in demanding environments.
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Log in to access trade discountsAnti-fog wide vision safety goggles providing EN166 certified protection against liquid splash, large dust, and gas for construction operatives, laboratory workers, and chemical processing operatives where a single goggle must address multiple simultaneous hazards without compromising vision or wearing comfort. The indirect ventilation design allows airflow through protected channels, reducing internal heat and fogging whilst maintaining full EN166 3, 4, and 5 protection, the combination that sealed non-vented goggles achieve at significant comfort cost. Certified to EN166 3 4 5 BTKN and EN170 2C-1.2, CE and UKCA marked, fully metal-free, and supplied in recycled packaging as part of the CMT ThinkGreen range.
Sealed non-vented goggles provide comprehensive hazard protection but trap heat and moisture against the face, in physically active environments, they mist rapidly, become uncomfortable within the first hour, and operatives remove them rather than tolerate the discomfort, creating the compliance gap the goggle was specced to prevent. The Weisshorn's indirect ventilation channels allow controlled airflow around the eye area, reducing internal temperature and the resulting condensation, whilst directing that airflow through channels that prevent direct particle or liquid ingress. The result is a goggle that passes EN166 codes 3 (liquid splash), 4 (large dust), and 5 (gas and fine dust), the same protection scope as a sealed goggle, in a construction that operatives will keep on their face for a full shift.
EN166 3 4 5 protection scope: Field codes 3, 4, and 5 confirm certified protection against liquid droplets and splashes, large dust particles, and gas and fine dust simultaneously, a protection combination that goggles must earn through specific testing, not claimed by design alone.
B-rated medium energy impact (120 m/s): EN166 B confirms the lens and frame withstand a 6mm steel ball at 120 m/s, significantly higher than the F-rated 45 m/s protection of safety glasses. Suited to demolition, grinding, cutting, and other environments where high-velocity particle risk is present.
Permanent anti-fog and scratch-resistant coatings, both sides: Applied permanently to both the inner and outer lens surface. Indirect ventilation reduces internal fogging from body heat; the permanent anti-fog coating provides a second layer of fogging resistance in temperature-change and physically active environments.
Wide vision clear polycarbonate lens: The wide-aperture lens design maximises field of vision within the goggle frame, reducing peripheral visual obstruction. Optical class 1 ensures minimum distortion throughout, suitable for all-day wear across extended shifts.
Flexible TPE seal: The thermoplastic elastomer seal flexes to conform to different facial profiles, distributing pressure evenly and maintaining the required seal for EN166 3, 4, and 5 compliance without the hard-edged discomfort of rigid PVC.
Metal-free construction: No metal components, frame, seal, headband fixings, and all components are non-metallic. Passes metal detection requirements for food production, pharmaceutical, and sterile environments as well as construction and industrial use.
Adjustable wide headband: Polyester and spandex wide headband distributes pressure across a larger contact area than narrow elastic alternatives. Adjustable for fit across different head sizes and over hard hats, hoods, and other site PPE.
Recycled packaging, ThinkGreen range: Recycled polyester pouch made from two reclaimed 1-litre plastic water bottles, supplied in a recycled paper box.
Trades and roles:
Laboratory and chemical processing operatives
Construction and demolition workers
Woodworking and fabrication operatives
Food production and pharmaceutical workers
Site managers conducting PPE issue across multi-hazard environments
Industries:
Chemical and pharmaceutical processing
Construction and demolition
Woodworking and manufacturing
Food production (metal-free environments)
Utilities and infrastructure
| Specification | Detail |
|---|---|
| Product Name | armourU Weisshorn Safety Goggles - Anti-Fog Wide Vision EN166 |
| SKU | AEYWEI |
| Product Type | Safety goggles — indirect ventilation |
| EN Standard | EN166:2001 and EN170:2002 |
| EN166 Marking | 3 4 5 BTKN |
| EN166 Field Code 3 | Protection against liquid droplets and splashes |
| EN166 Field Code 4 | Protection against large dust particles (≥5 microns) |
| EN166 Field Code 5 | Protection against gas and fine dust particles (<5 microns) |
| EN166 B | Medium energy impact resistance — 120 m/s steel ball |
| EN166 T | Resistance to hot particles and extreme temperatures |
| EN166 K | Resistance to surface damage by fine particles (anti-scratch) |
| EN166 N | Not susceptible to fogging (anti-fog) |
| EN170 Marking | 2C-1.2 |
| UV Protection | Filter code 2C — full UV-A and UV-B protection |
| Optical Class | Class 1 — highest optical quality, minimum distortion |
| Style | Wide vision, indirect ventilation |
| Lens Material | Clear polycarbonate (PC) |
| Lens Colour | Clear |
| Lens Treatment | Permanent anti-fog and scratch-resistant coatings — both sides |
| Frame | Polycarbonate (PC) |
| Seal | Flexible TPE |
| Headband | Adjustable polyester and spandex wide headband |
| Metal-Free | Yes — no metal components |
| Weight | Approximately 86g |
| Compliance Markings | CE and UKCA |
| Pouch | Recycled polyester (made from two reclaimed 1-litre plastic water bottles) |
| Packaging | Recycled paper box |
| Application or Condition | Detail |
|---|---|
| Liquid droplets and splash protection | ✓ Compatible |
| Large dust particle environments (≥5 microns) | ✓ Compatible |
| Gas and fine dust environments (<5 microns) | ✓ Compatible |
| Medium energy impact tasks (B-rated, 120 m/s) | ✓ Compatible |
| Hot particle environments — grinding, cutting | ✓ Compatible |
| UV protection — outdoor use | ✓ Compatible |
| Metal detection environments — food and pharmaceutical | ✓ Compatible |
| Use over prescription glasses | ✓ Compatible |
| Humid and physically active environments (anti-fog) | ✓ Compatible |
| High energy impact tasks (A-rated) | ✗ Not recommended — rated B (medium energy) only |
| Welding arc protection | ✗ Not recommended — no welding filter |
| Laser protection | ✗ Not recommended — no laser filter |
| Respiratory protection against gas | ✗ Not recommended — not a respiratory device |
Anti-fog wide vision safety goggles used by laboratory operatives, construction workers, and chemical processing staff who require EN166 certified protection against liquid splash, dust, and gas in environments where a single goggle must address multiple simultaneous hazards. They are equally suited to woodworking and demolition operatives exposed to high volumes of fine dust and flying debris, and to food production and pharmaceutical workers on metal-free specified sites where goggles with sealed orbital coverage replace open-frame spectacles entirely.
Chemical laboratory work involving liquid reagents, splash risk, and airborne vapours where EN166 codes 3, 4, and 5 are specified in the site risk assessment.
Construction demolition and breaking work generating high volumes of fine dust, debris, and particles at velocities requiring B-rated impact protection.
Woodworking, routing, and sawing tasks producing fine dust below 5 microns alongside flying chip and debris hazards.
Spray painting and coating applications where liquid droplets, aerosol mist, and vapour are simultaneously present throughout the task.
Grinding and cutting operations producing hot particles, sparks, and metal debris requiring T-rated extreme temperature resistance.
Pharmaceutical manufacturing and laboratory environments where metal-free PPE is specified and sealed orbital coverage is required for the task.
Food production environments with splash risk from cleaning chemicals or liquid processes where metal-free goggle protection is mandated.
General construction and site work where operatives wear these over prescription glasses, requiring a wide-fitting goggle that accommodates standard spectacle frames.
Step 1: Position the goggle over both eyes with the polycarbonate frame seated against the face. Ensure the flexible TPE seal contacts the skin around the full orbital area without gaps.
Step 2: Pull the wide headband over the head and adjust the buckle or slider to achieve a secure, comfortable fit. The headband should sit flat without twisting.
Step 3: Check the TPE seal is seated evenly around the orbital area, any gap in the seal compromises EN166 3, 4, and 5 protection. Re-position if the seal lifts or gaps at the nose bridge or temples.
Step 4: Do not touch the inner lens surface with fingers, skin oils degrade the anti-fog coating. Clean only with dedicated lens wipes or a clean soft cloth.
Step 5: Store in the supplied recycled polyester pouch when not in use to protect the lens surface.
Wearing with gaps in the TPE seal: any break in the orbital seal removes the protection the goggle provides against liquid splash, dust, and gas ingress. Check the seal is continuous before beginning work in hazardous environments.
Assuming EN166 gas protection means respiratory protection: EN166 field code 5 confirms the goggle seals the eyes against gas and fine dust ingress, it does not protect the respiratory system. Appropriate respiratory PPE must be specified separately for airborne hazardous substances.
Cleaning with solvent-based products: acetone, alcohol sprays, and solvent cleaners degrade polycarbonate and permanently impair both the anti-fog and anti-scratch coatings. Use water or a dedicated water-based lens cleaner only.
Storing without the pouch: a polycarbonate goggle lens stored loose picks up scratches from contact with hard objects in tool bags and storage boxes. Store in the supplied pouch between every use.
Continuing to use a cracked or impact-damaged lens: polycarbonate with visible cracking or impact damage no longer provides reliable EN166 B-rated impact protection. Replace immediately when damage is visible.
These goggles are certified to EN166 3 4 5 BTKN (liquid splash, large dust, gas and fine dust, medium energy impact, hot particles, anti-scratch, anti-fog) and EN170 2C-1.2 (UV protection, optical class 1). They do not provide respiratory protection against gas or vapour, appropriate respiratory PPE must be used alongside these goggles where airborne hazardous substances are present. They are not rated for high energy impact (A-rated) tasks, welding arc exposure, or laser protection. Specify and use in accordance with the Personal Protective Equipment at Work Regulations 1992 (as amended) and the findings of a suitable workplace risk assessment. EN166 is being superseded by EN ISO 16321, this product's existing certification remains valid during the current transition period.
Clean with dedicated lens wipes or a clean soft cloth moistened with water or a water-based cleaning solution. Never use solvent-based cleaners, paper tissue, or rough fabric. Clean the TPE seal with a damp cloth after each use to remove chemical residue, dust, and sweat. Inspect the lens before each use and replace if cracking, impact damage, or heavy scratching is visible. Inspect the TPE seal for deterioration and replace the goggle if the seal no longer contacts the face evenly. Store in the supplied recycled polyester pouch.
Q: What do EN166 field codes 3, 4, and 5 mean in practice?
A: The field codes in the EN166 3 4 5 BTKN marking describe the specific hazard categories the goggle has been tested and certified to protect against. Code 3 confirms protection against liquid droplets and splashes, the goggle seal prevents liquids from reaching the eyes during splash-risk tasks. Code 4 confirms protection against large dust particles of 5 microns and above, relevant for construction, demolition, and woodworking environments where visible dust is generated. Code 5 confirms protection against gas and fine dust below 5 microns, the most demanding field code, requiring that the goggle seal prevents even fine airborne particles from reaching the eye. Together, codes 3, 4, and 5 cover the full range of particulate and liquid hazards a single goggle can be certified against under EN166.
Q: What does EN166 BTKN mean?
A: BTKN describes four additional performance characteristics of the goggle. B confirms medium energy impact resistance, the lens and frame have been tested against a 6mm steel ball at 120 m/s without failure, providing significantly higher impact protection than the F-rated 45 m/s of safety spectacles. T confirms resistance to hot particles and extreme temperatures, covering grinding, cutting, and other tasks producing hot debris. K confirms the anti-scratch coating meets EN166's abrasion resistance requirement. N confirms the anti-fog coating meets EN166's fogging resistance requirement. CE and UKCA markings confirm independent assessment under UK PPE Regulations.
Q: What are these goggles not suitable for?
A: EN166 field code 5 confirms the goggles protect the eyes against gas ingress, they do not protect the respiratory system, and appropriate respiratory PPE must be specified separately wherever airborne hazardous substances are present. These goggles are rated B (medium energy impact, 120 m/s) and are not suitable for high energy impact tasks that require A-rated protection. They carry no welding filter or laser filter rating and must not be used for welding arc or laser exposure.
Q: What is indirect ventilation and why can these goggles still protect against gas?
A: Indirect ventilation means the goggle allows airflow through channels that are angled or baffled to prevent a direct path between the outside environment and the inside of the goggle. Air can circulate, reducing heat and condensation, but particles, liquid droplets, and gas must travel through a sealed indirect route that prevents them from entering the orbital area. This is how the Weisshorn achieves EN166 field codes 3, 4, and 5 despite not being a fully sealed non-vented goggle. Direct-vented goggles, by contrast, have open holes that allow direct airflow and cannot achieve codes 3, 4, or 5.
Q: What is the difference between these goggles and the armourU safety glasses?
A: The safety glasses (Kanchenjunga, K2C, K2S) are open-frame spectacles rated to EN166 FTKN at F (low energy impact, 45 m/s). They provide no splash, dust, or gas protection because an open frame cannot seal against the face. The Weisshorn is a sealed goggle rated to EN166 3 4 5 BTKN at B (medium energy impact, 120 m/s), providing certified protection against liquid splash, large dust, and gas and fine dust, the four-fold step up in hazard coverage and impact rating that environments with multiple simultaneous hazards require.
Q: Can these goggles be worn over prescription glasses?
A: The wide-aperture polycarbonate frame and flexible TPE seal are designed to accommodate a range of facial profiles, and the wide vision design provides sufficient internal clearance for most standard prescription spectacle frames to fit underneath. The adjustable headband maintains the seal position across different head sizes. For operatives with prescription eyewear who require certified eye protection across the full orbital area, these goggles are a practical option where prescription safety goggles are not available.
Q: How do I maintain the anti-fog coating inside the goggle?
A: Clean the inner lens surface only with dedicated lens wipes or a clean soft cloth and water, never with paper tissue, rough cloth, or solvent-based cleaners, which scratch the polycarbonate and degrade the anti-fog coating permanently. The indirect ventilation reduces internal condensation by allowing airflow, working alongside the permanent anti-fog coating to maintain clear vision in physically active and temperature-variable conditions. Store in the supplied pouch to protect the coated surfaces between uses.
Q: Can I set up a contract account for ongoing goggle supply across multiple sites?
A: CMT Group's EDGE procurement portal provides agreed contract pricing by volume tier, role-based spending controls per site or project, live stock visibility, and full delivery tracking from despatch to drop-off, designed specifically for procurement teams managing PPE supply across multiple locations from a single account. The EDGE App allows orders to be placed in seconds from any device, 24/7, with live pricing and stock confirmation before checkout.
Q: What makes CMT Group a reliable source for certified safety goggles for ongoing industrial contracts?
A: CMT Group has supplied UK construction, chemical, pharmaceutical, and industrial sites since 2010 and is rated Excellent on Trustpilot. Large stock holdings across UK fulfilment centres mean no backorders on core PPE lines, and CMT's own delivery fleet covers over 95% of the UK mainland, not a third-party courier, with live tracking from despatch to drop-off. Repeat buyers earn FASTPoints on every online purchase, which reduces the unit cost of ongoing PPE replenishment programmes over time.
