Pure Filtration for the galvanic industry

Dorsan ® is a global leader in the manufacturing of filter media for the galvanic industry.

With our presence in Germany, India, Mexico and Spain, we aim to be very close to our international

costumers and markets.

German technology allows us to design the most advanced products and provide our costumers

with top-quality filtering processes. In addition, we work closely with thw main manufacturers of pumps

fot the galvanic industry, jointly developing the most fitting solutions for all bath types.

Selecting the best filter medium will greatly reduce the cost of chemical products and rejected parts.

Filtration is, without a doubt, the most highly valued process at the leading galvanic industry companies.

Our wide range of products and many years of experience in the sector make Dorsan® the best bath filtration choice for companies involved in auto manufacturing, health care, electronics and other highly demanding industries.

“The German auto industry, with the highest quality in the world, trusts Dorsan® for bath filtration”

Filter Paper

With cellulose and cotton fibres of high purity. They represent the most widely used filter medium in the

galvanic industry for their excellent performance and compatibility with the vast majority of baths.

Manufactured with special humidity-resistant agents to prevent undesires breakage during the filter process.

Perfect for filtering baths at 60° or higher where other materials, such as polyoropylene, can not be used.

We offer the possibility to choose between filter papers with filtration adjuvants (diatomaceous earth, activated carbon…) or for direct fine filtration. Different grammages and thicknesses allow us to lenghten filter cycles to the max. We provide the widest range of sizes on the market for pumps by Mefiag, Siebec, La Fonte, Sager+Mack…

(Wide selection of formats. Crepe and Smooth)

Activated Carbon Filter Paper

The advantages of CA-160 and CA-500 are:

• Eliminate the pre-layer of powdered carbon filter aid.
• Avoid sending activated carbon to decorative baths.
• Reduce organic matter to improve the distribution of high and low density zones in tanks.
• Compatible with process involving zinc, nickel, alloys(Zn/Ni,Zn,/Fe), Cu.
• Preventive filtration with activated carbon to prolong transfers to auxiliary vats and use powdered carbon.

CA-160 is the most widely used in galvanic plants around the world (grammage of 160g/m² and 25% carbon).

CA-500 is highly prized by the manufacturers of galvanised ABS plastics fot the auto industry (high grammege 500g and 50% carbon).

(More carbon – New CA500 – More production)

Polypropylene / Polyester Filter Medium

In industries with very demanding fine filtration requirements or extreme pH levels, filter paper is not enough.

For these cases, at Dorsan® we have developed two types of material manufactured with neither binders

nor adhesives and with extensive chemical compatibility. The 100%-polypropylene type can be used for bath

temperatures of up to 60°C. For temperatures of up to 120°, the option would be the 100%-polyester type.

They make it possible to obtain a filter quality of up to 0.5 mocrons in a depth filtration process with elevated filtration cycles and trap inside a large quantity of particles under 1 micron in size. (see photo) Available in any disc format for any filter pump.

Wound Filter Cartridges

The use of wound filter cartridge is growing as a supplement to paper filters in the galvanic industry. Their low cost and easy installation make them the perfect ally in filtration processes with high suspended particle contents.

Many cartridges on the market contain waxes and oils, which produce unpleasent and costly foam when used.

Dorsan® cartridges do not produce foam in the bath.

Available in polypropylene, cotton, polyester, or glass fibre thread and in standard 2.5” or BIG diameter. The most broadly used material is wound polypropylene thread, due to its high chemical compatibility.

(Possibility with stainless steel inner tube)

Meltblown Filter Cartridges

When highly effective depth filtration is needed, Meltblown cartridges represent the best choice. Made with 100% polypropylene fibres, free of any binders or adhesives which may provoke undesired reactions in the bath. Available in absolute and nominal retention options.

Structured in layers of progressively varying porosity to ensure a high contaminant retention capacity, a high flow rate and long use cycles. Possibility of polypropylene inner tube to increase stiffness and resistance to breakage under high pressure.

(Absolute and Nominal Filtration)

Activated Carbon Filter Cartridges

Activated carbon is an inert, microporous product that has undergone a treatment to wxpand its surface. The enormous specific surface area of activated carbon – reaching from 100 to 2000 m²/g – is what gives this material its high absorption capacity.

Available in different sizes from 9¾” to 30”. Granulated, block or coated cellulose.

With diameters of 2.5” to 6” and wide chemical compatibility.

(Full range of different lenghts)

PVDF Filter Cartridges

Certain galvanic processes, like in the electronics industry or special chrome baths, require the use

of filter media with high purity, strenght and chemical resistance.

For this reason, we have created a type of cartridge in which the carcass and filter medium are 100% PVDF (polyvinylidene fluoride).

It stands out for its high temperature resistance (up to 150°C) and elevated resistance to acids, bases and solvents.

It is highly resistant to chlorine, bromine and UV rays. PVDF is, by nature, a hydrophobic material.

To make it easier to use, our filters have been surface treated to endow them with hydrophilic properties.

Filter Bags

In processes which require fast filter changes but are less demanding in terms of filter quality,

the use of filter bags is recommended. In galvanic baths, polypropylene filter bags are primordially

used due to their wide chemical compatibility up to 80°C. In hotter baths, polyester bags are recommended.

Our products line includes various sizes and thicknesses depending on the volume of the bath to filter.

We produce our filter bags with polypropylene or steel rings depending on bath features or costumer requirements.

Filter Paper

Galvanic indusry labs tend to be the side of small filtrations of chemical products and tests on the state of the bath.

For theese applications, Dorsan® filter papers in crepe filter format or flat discs are the best option on the market.

Our wide selection of porosities and sizes is designed to meet the filtering requirements of all our costumers.

Spaguetti

Popularly known as SPAGHETTI, these olefinic and hydrophobic polypropylene fibres are chemically inert.

They have the property of absorbing the oils and fats present in baths, generally of the alkaline type.

They represent effective filtration in the degreasing of chemicals and electrolytes.

Their use in the first tank (degreasing) prevents problems in subsequent tanks.

Degraeasing baths, nickel, zinc, copper baths (very high dirtiness or oil absorption), flow baths in

galvanisation, all active baths and pickling baths. In anodising systems: colour baths, sealing baths…