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Zinc flake coatings are non-electrolytically applied coatings, which provide good protection against corrosion. These coatings consist of a mixture of zinc and aluminium flakes, which are bonded together by an inorganic matrix. There are a number of components which are combined to produce a high performance protective coating. The wide variety of components gives a wide spectrum of possibilities to solve any coating requirement need. For specific applications, Shiva Co. is able to formulate a specific product that will achieve optimum technical performance within the cost/price economic window. Each coating formulation will have a number of components combined with Zinc Flakes, such as

• Binders are the materials which hold the other protective coating components to one another and to the surface of the substrate.

• Metallic Pigments provide sacrificial protection to the substrate; these are metals that are more reactive than the substrate. While many metallic pigments are used. The flake pigments give a brighter appearance than the dusts, which give a flat matt appearance. Corrosion protection is generally similar, although flake pigments offer better corrosion protection.

• Lubricants reduce the coefficient of friction of the coating, resulting in improved torque-tension relationships for threaded fastener assemblies and improved bulk processing of parts. The lubricating pigments are selected according to price performance parameters.

• Inhibitive Additives are added to protective coating formulations to enhance the performance of the metallic pigments by reducing their electrochemical activity. Typical inhibitive pigments which can be incorporated in protective coating formulations

Coating Thickness
Zinc flake coatings have thicknesses in the range of 5-12 microns and in contrast to electroplated coatings the coating is thicker at thread roots and in recesses, and thinner at crests and edges. Tightness to thread inspection gauges will be experienced with fine threads at M4 and below although in most situations this will not inhibit assembly into tapped holes and standard nuts. This phenomenon of dip-spin applied zinc flake coatings being thicker in recesses can ensure that recessed parts or complicated pressing with folds, etc. will have far better corrosion resistance than when electroplated due to the electroplated coatings being thin in “shielded” areas. In some cases, however, this recess build up with dip spin applied zinc flake coatings can be a major problem.

Performance Advantages of Zinc Flake Coatings :

• Excellent resistance to atmospheric corrosion.
•Limited “white” rust (zinc corrosion products) or other corrosion products in service.
•Neutral salt spray corrosion resistance exceeds that of many other common surface finishes, e.g. electro and mechanically plated zinc and sheradising.
•Resistance to many “mild” chemicals and solvents including petrol and brake fluids
•No hydrogen embrittlement. It is a non-electrolytic process.
•Can be electrically conductive.
•Galvanic protection by the zinc-rich coating ensures satisfactory performance at bimetallic contacts with steel, aluminium, zinc and cadmium in most situations.
•Complex shapes, recesses and holes are coated with suitable equipment.
•Low thicknesses can give corrosion resistance equivalent to much higher thicknesses of conventional coatings.

Typical parts which can be zinc flake coated are:
• Threaded fasteners particularly strength grades 10.9 and 12.9.
• Pressings, springs, clips as required for vehicles, domestic appliances and on buildings.
• High tensile steel (particularly above 1000 N/mm2) and case hardened parts requiring surface protection without possible hydrogen embrittlement.
• Sintered and cast steel and iron components.
• Parts of complex shape and those with holes and recesses.
• Compound assemblies e.g. lock parts and hose connectors.

International Standards
•ASTM F1136: Standard Specification for Zinc/Al. Corrosion Protective Coatings for Fasteners
•ISO 9227: Corrosion tests in artificial atmospheres
•ASTM B117: Standard Practice for Operating Salt Spray (Fog) Apparatus
•DIN EN ISO 10683 sets out the requirements for zinc flake coatings for threaded fasteners
•DIN EN 13858 describes the requirements for zinc flake coatings for fasteners with no thread and for other parts as well (iron or steel components)
•DIN EN 15205: Determination of Hexavalent chromium in corrosion protection layer- Qualitative analysis
•DIN EN 62321; VDE 0042-1:2006 procedures for determination of levels of six regulated substances (Lead, Mercury, Cadmium, Hexavalent Chromium, Polybrominated Biphenyls, Polybrominated Diphenyl Ethers) in electro technical products (IEC 111/54/CDV:2006)

Environmental Friendly
No Declarable Substances are present in Zinc flake coating, for instance Chrome VI, Chrome IV, Cadmium, Lead, MoS2, Cyanide, Cobalt, Nickel, Barium, Mercury, PBDE (Polybrominateddiphenyl Ether) and PBB (Polybrominatedbiphenyl). These hazardous materials in the production of various types of electronic and electrical equipment are strictly restricted.

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For more than 35 years, DACROMET® has been used worldwide for high performance corrosion protection on wide variety of metallic parts
Thin dry-film, non-electrolytic, self-lubricated or not
Water-based chemistry
Passivated zinc and aluminium flakes in a binder, patented chemistry
Binder contains chromium oxide (Cr3+ and Cr6+)
Metallic silver appearance

What is DACROMET®
DACROMET® is an aqueous solution comprising zinc in flake phase, aluminium metal powder and inorganic compound. It is normally treated by dip and spin coating of this aqueous solution followed by heat-treatment at a relatively high, that is, about 300°C temperature. As a result, 7-8 μm thick coating is formed by drying and curing during the hot air drying process. Metal zinc and aluminium, which constitute the coated film, can protect steel via self-sacrificing, namely, by inhibiting the corrosion of a given steel due to the electric activity of highly ionisable metal zinc. Here, the chromic acid in a polymerized state can control and inhibit the self-sacrificing of metal zinc thus serving the role of a binder while also establishing the passivation of coating, which then leads to inhibition of chemical reaction between zinc and iron and accordingly reduces the speed of corrosive progress, thus exhibiting high corrosion resistance. In addition, the zinc, aluminium flake and metal oxide, which are of multi-layered structures, can protect the surface of iron alternatively thus functioning as a barrier against external corrosive factors thereby exhibiting superiority in corrosion resistance.

Characteristics and Performance*
• Controlled coefficient of friction (ISO 16047):
• DACROMET® 320 + PLUS® or DACROLUB® topcoat ⇒ μ from 0.06 to 0.19
• DACROMET® 500 ⇒ μ = 0.15 ± 0.03 without topcoat
• No hydrogen embrittlement
• Excellent assembly and multi-tightening behaviour (with lubricated topcoat)
• Good mechanical damage resistance (trial method D24 1312, USCAR 32) and chemical resistance (trial VDA 621-412)
• Suitable for high-temperature applications (up to 300°C)
• Paintable coating
• Electrical conductivity for most application processes
• Competitive application costs
• Bimetallic compatibility with aluminium

* Results may vary depending on substrate, geometry of parts and type of application processes
Application Process
DACROMET® can be applied by Dip-Spin, Spray or Dip-Drain (Spin) using bulk or rack

Health and Safety
• Aqueous dispersion
• Complies with REACH

National & International Standards
• EN ISO 10683 – Fasteners: non-electrolytical zinc-flake coatings
• EN 13858 – Non-electrolytical zinc-flake coatings on iron or steel parts
• ASTM F1136 / F1136 M – Zinc/Aluminium corrosion protective coating for Fasteners

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Cutting the cost of corrosion
There are many applications for our specialist automotive coatings. PTFE provides excellent corrosion protection for connectors, clips, springs and fasteners. In addition to its excellent anti-corrosion properties, our coatings for the automotive sector also have many other benefits:

‣ Anti-galling
‣ Noise damping
‣ Extreme temperature resistance
‣ Non-stick
‣ Electrically non-conductive
‣ Non-wetting
‣ Performance of parts are greatly enhanced and contribute to higher efficiency and lower manufacturing costs.
‣ F1 racing is one area that benefits from the properties of PTFE coatings for car parts. Many elastomeric and rubber components are coated for noise reduction, anti- squeak, sealing and ease of movement.

Coating Applications
‣Clips
‣Fasteners
‣Springs
‣Under-bonnet
‣Bushes & bearings
‣Exhaust systems
‣Tyre moulds
‣Seals & O-rings
‣Blades
‣Filters
‣Screens

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Knowledgeable about non-stick release PTFE

Shiva Co. is a specialist supplier of non-stick coatings for industrial bakeware. All our bakeware coatings comply with FDA regulations governing components of coatings for direct food contact. Customers large and small are treated individually and we guarantee each product is finished to the highest quality, ensuring maximum long life and durability. Furthermore, the cost savings to business in the bakeware industry are considerable.

Oil and grease-free release coatings
For a number of years now the bakery industry has been transformed by the use of food approved non-stick release coatings. Clean and safe non-stick baking has become a reality with substantial advantages over traditional silicon glaze. Our range of coatings includes many standard one-, two- and three-coat PTFE systems as well as the more durable longer life, multi-coat FEP and PFA systems, which are tailored for specific difficult ingredient mixes and baking conditions in plant bakeries, artisan/craft bakeries, in-store supermarket bakeries and cake & confectionery bakers. We are happy to coat samples that can be tested in the process and monitor the results, ensuring that the correct coating choice and recommendations are made.

Let us make the right choice of coating for you
Our specialist knowledge and investment in developing these advanced food approved release coatings enables us to choose the right coating for the job. Our relationship with the customer is paramount as understanding the process and parameters the coated product will be subjected to is the only way to ensure the best and most appropriate coating is offered.

Problem solving
We welcome technical challenges in providing a solution to your non-stick problems. Our understanding of the chemistry of the polymer coatings enables us to develop new applications for specific situations. We are happy to coat samples that can be tested in process and monitor the results.

Bakeware Services and Applications

Product applications for our bakeware coatings
Bread pans, bread straps, bun trays, baguette trays, pizza pans, pizza trays, muffin pans, muffin trays, morning goods trays, crumpet rings, cake tins, cake moulds, pie hoops and tins, specialty food moulds & presses, blades & cutters.

Refurbishment of ancillary bakery equipment
Our bakeware coatings are used on many types of bakery equipment and we also offer a refurbishment and re-coating service for these items. Examples include dough hoppers and chutes, dough rounders, dough moulders and embossing rollers, spreader bars, mixing blades, food moulds & die plates, winkler cups, packaging and heat seal bars.

Design and Manufacturing Service
In addition to our coating and refurbishment service we are able to offer a complete supply solution including either standard or bespoke metalwork. This makes us a complete one-stop-shop for new supply, refurbishment and replacement of all of your non-stick coated bakeware requirements, including pizza pans, muffin trays, strapped bread tins and bun tins.

Benefits of our non-stick coating range

• Increased productivity
• Cost reductions
• Longer life release
• Improved product quality
• Improved product appearance
• Safer and cleaner working environment
• Reduced fire risk
• Consistency and reliability of release

Why choose us?

• Convenient collection
• Improve the lifespan on your items
• Fast turnaround and re-delivery
• Our honest approach

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Powerful PTFE application for your business
The versatility of PTFE coatings makes them ideal for use in the electrical sector. We pride ourselves on choosing the right coating for each application to ensure your business gets the best result first time, every time.

Electrical coatings benefits at-a-glance
PTFE will deliver a number of benefits once applied to your electrical equipment including:
‣ High dielectric strength
‣ Non-conductive coating
‣ High temperature capability
‣ Low dissipation factor
‣ Very high surface resistivity
‣ Good UV resistance
By using specialist techniques our polymers can be made static dissipative (anti-static), non-conductive or even conductive for specific applications.

Coating Applications
‣ Cable guides
‣ Soldering equipment
‣ Printers
‣ Light fittings
‣ Electrical equipment
‣ Connectors
‣ Bus bars
‣ Solenoids
‣ Domestic appliances

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Fluoropolymer Coatings are known for their inertness to most chemicals, resistance to high temperatures, extremely low coefficients of friction and excellent dielectric properties which are relatively insensitive to temperature and power frequency. Fluoropolymers make up a family of thermoplastic resins analogous to polyethylene in which some of the hydrogen atoms attached to the carbon chain are replaced by fluorine or fluorinated alkyl groups. In some cases, other halogens such as chlorine are also part of the molecule.

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