Europe · Window Manufacturer
Internorm
🇦🇹 Austria · Last reviewed by Justin Orloff
Quick Facts
founded
1931
hq
Traun, Austria
primaryMaterials
uPVC, uPVC/aluminium, timber/aluminium
glazingPartner
In-house, triple-glazing pioneer
marketTier
Premium
Brand at a Glance
- Founded: 1931
- HQ: Austria
- Market position: Europe's largest window manufacturer
- Frame materials: uPVC, uPVC/aluminium, timber/aluminium
- Glazing: In-house sealed units - triple glazing standard, Passivhaus-certified U-values, Low-E coatings; acoustic and safety glass options
- Key products: KF 410 (uPVC), KF 510 (uPVC/alu with I-tec Secure), Timber/alu series
- Certifications: Passivhaus, triple glazing pioneer
- Where they sell: Europe-wide via distribution partner network
- Warranty: 30-year serviceability assurance (maintenance-conditional)
- Official documentation: Internorm Fibel / Gebrauchsanweisung
- Care page: internorm.com
Product Range
- KF 410 (uPVC)
- KF 510 (uPVC/alu)
- Timber/aluminium series
Why This System
Three completely different frame systems live under one brand. Identify the material before you pick a cleaner. I-tec Secure conceals all hardware inside the frame and sash - no visible screws, hinges, or dirt grooves in the rebate. Rounded sash edges make the closing area faster to wipe than older tilt-turn designs. uPVC frames will permanently 'burn in' cleaning product residue if it dries on the surface - always rinse with clear water.
Step 1 of 2: Manufacturer Recommendations
Official Care Guidance
What NOT To Do
- No razor blades or steel wool on glass.
- No alkaline solutions, acids, or fluoride-containing cleaners on glass.
- No nitro thinner, petrol, acetic acid, nail polish remover, alcohol, ammonia, or sulphur-containing products on uPVC.
- No orange or lemon-scented cleaning products on uPVC.
- No cleaning aluminium in direct sunlight or above 25 °C surface temperature.
- No abrasive or solvent-containing products on lacquered timber.
- Never let cleaning product residue dry on uPVC - always rinse with clear water.
- No steam cleaners on aluminium.
- No products that impair corrosion protection on hardware.
- Do not skip annual hardware lubrication - Internorm warns this can lead to sash failure.
Bundle Kits and Tool Recommendations
Bundle Kit
Tool Recommendations
Microfibre T-bar applicator
View on Amazon [coming soon]Professional squeegee with quality rubber blade
View on Amazon [coming soon]100% cotton towelling rag (not microfibre) for detailing
View on Amazon [coming soon]Cleaning Frequency
Clean every 4–8 weeks depending on environment.
Frequently Asked Questions
Field Notes
“Use the cleaning stay-arm (Putzschere). Internorm tilt-turn windows have a stay-arm that lets you tilt the sash beyond the standard tilt position, giving access to the outer glass surface from inside. Use it on upper floors. Glass and frames: minimum twice per year. Near industrial areas, railways, or busy roads, increase frequency. Contaminants left on uPVC can cause permanent staining. Internorm recommends annual servicing through their distribution partner network - hardware checks, gasket inspections, seal adjustments, functional testing. If someone else cleans your windows - a housekeeper, a regular cleaner, a property manager - they almost certainly have no specialist knowledge of Internorm's coatings. Pass this guide on to them.”
Justin Orloff
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