From GEOMET® zinc flake to PTFE fluoropolymers — explore the full Aum Dacro range, the products within each system, and how they compare. Pick a product to see its specs come alive.
Advanced, non-electrolytic anticorrosion systems built from overlapping zinc–aluminium lamellae. They deliver a thin, uniform barrier without altering dimensions — and their defining advantage is no hydrogen embrittlement, making them the trusted choice for high-strength fasteners.
Multifunctional sealers applied over a zinc flake basecoat. They stabilise the coefficient of friction, add chemical resistance and colour, and boost overall corrosion performance. Select a product to see its friction window.
Stabilising the coefficient of friction delivers a consistent clamp load — preventing loosening while cutting cost and weight.
A stable friction coefficient yields consistent clamp load across every bolt at the same torque.
Reduces friction-coefficient variation — three line-ups let you match the exact requirement.
At 20 N·m on M8, output rises from ~7 kN (dry) to ~17 kN — far more from the same bolt.
More clamp force means fewer and smaller fasteners — reducing cost and total weight.
A high-temperature diffusion process forms a zinc–iron alloy directly on the metal surface — a metallurgically bonded coating that will not flake, chip or peel, even under extreme conditions. Completely dry and eco-friendly, with no liquid baths or chemical waste. Proven by brands like ArmorGalv® (Distek).
Corrosion resistance with a uniform, chip-proof, metallurgically bonded zinc–iron layer — including full coverage on threads and internal surfaces, via a dry, eco-friendly process.
Depositing a thin metal layer using electric current to improve corrosion resistance, aesthetics and electrical conductivity — with exceptional throwing power on complex parts.
High-performance fluoropolymer coatings known for exceptional non-stick properties, chemical resistance and low friction — used across automotive, aerospace, food processing, medical and industrial manufacturing.
DACROMET® is the earlier-generation zinc flake coating from the same technology family. It contains hexavalent chromium (Cr VI), which restricts its use in EU ELV, RoHS and REACH-regulated assemblies. GEOMET® is the chrome-free successor — same cathodic protection, no restricted substance. If your drawing still calls out DACROMET®, we can advise on the GEOMET® equivalent and manage the qualification.
| Zinc Flake | PTFE | Zinc Thermal | Alkaline Zinc | Alkaline Zn-Ni | Hot-Dip Galv. | |
|---|---|---|---|---|---|---|
| Application | Non-electrolytic (dip-spin / spray) | Spraying / coating | Thermal diffusion | Electroplating | Electroplating | Molten-zinc immersion |
| Corrosion protection | Excellent (cathodic + barrier) | Good–excellent (barrier) | Very good–excellent (cathodic + barrier) | Good (cathodic) | Superior (cathodic) | Excellent (cathodic + barrier) |
| Thickness (µm) | Thin (5–15) | Varies greatly | Thick (50–500) | Thin (5–20) | Thin (5–15) | Thick (45–200) |
| Unique strength | No hydrogen embrittlement — ideal for high-strength fasteners | Extremely low friction (non-stick) & chemical resistance | Coats large structures & complex threads with a bonded layer | Exceptional throwing power on complex parts | Highest corrosion resistance of plated coatings (>1000 h) | Metallurgical bond; most cost-effective for structural steel |
Send us your drawings or specs — our technical team recommends the right system within one business day.
A non-electrolytic coating of overlapping zinc and aluminium flakes in an inorganic binder, applied by dip-spin or spray and cured. It provides cathodic corrosion protection without hydrogen embrittlement risk, in a film thin enough to preserve fastener thread fit.
For high-tensile fasteners, zinc flake avoids hydrogen embrittlement and reaches higher salt-spray life at lower thickness. Zinc plating remains preferable where conductivity, a bright finish or lowest cost per part is the priority.
Typically 8–12 µm for basecoat, rising to 10–20 µm with a top coat. Thin enough to preserve thread fit on fasteners, which is a key advantage over hot-dip galvanising.
No. GEOMET® and the zinc flake systems we apply are Cr(VI)-free, which allows use in assemblies subject to EU ELV, RoHS and REACH.
Performance depends on the system, film build and part geometry. Zinc flake basecoat-plus-topcoat combinations are commonly specified for several hundred hours to red rust under ISO 9227, with higher-performing systems available.
Both are zinc flake systems. DACROMET® is the older generation containing hexavalent chromium; GEOMET® is the Cr(VI)-free successor. For regulated assemblies, GEOMET® is the correct specification.