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Coatings
Blygold Technologies have provided for the last 35 years the HVAC/R industry a set of solutions to increase the life of systems as well as maintain their energy efficiency for the last 35 years.
The wide range of Blygold products and services responds to all HVAC/R needs, including:
The Blygold Standard painting system for copper-aluminium coils, which withstands 4.000 hour salt-spray tests, is the following:
− Cleaning of surfaces to be coated with hot water at 100 bar and “Coil Clean” cleaning agent
− Rinsing with sweet water to remove cleaning agent
− Removal of residues of water with compressed air
− Combing of fins to improve material penetration (if required)
− Painting system on aluminum fins: supply and application of PoluAl XT to a dry film thickness of 25-30 Hm applied with special equipment
− Painting system on casing and external copper tubes:
Supply and application of one coat of Refamac 3509 Primer to a dry film thickness of 55-60 Hm
Supply and application of one coat of PoluAl XT MB to a dry film thickness of 25-30 Hm
Inspection and quality control in accordance to Blygold protocol.
Blygold Standard Painting System for Copper-Copper Coils
The Blygold Standard painting system for copper-copper coils, which withstands 4.000 hour salt-spray tests, is the following:
− Cleaning of surfaces to be coated with hot water at 100 bar and “Coil Clean” cleaning agent
− Rinsing with sweet water to remove cleaning agent
− Removal of residues of water with compressed air
− Combing of fins to improve material penetration (if required)
− Painting system on aluminum fins:
Supply and application of a first coat of PoluAl XT
Supply and application of a second coat of PoluAl XT to a total dry film thickness of 25-30 Hm applied with special equipment
− Painting system on casing and external copper tubes:
Supply and application of one coat of Refamac 3509 Primer to a dry film thickness of 55-60 Hm
Supply and application of one coat of PoluAl XT MB to a dry film thickness of 25-30 Hm
Inspection and quality control in accordance to Blygold protocol.
The Blygold PoluAl XT coating provides a long lasting corrosion protection to heat exchangers, without affecting heat transfer and pressure drop.
Treatment: Blygold PoluAl XT
Coating type: Aluminum pigmented polyurethane
Color: Champagne
Pretreatment: Degreasing
Temperature Range (dry): -20 to 150°C (-4° to 302°F)
Substrates: Aluminum and Copper
ASTM B117: 4000+ hours (neutral-salt spray test)
ASTM B-287: 4000+ hours (acid-salt spray test)
Kesternich (2.0 ltr SO2): 80 cycles
Layer Thickness: 25-30 μm (1 mil)
Pressure Drop: 0-5 % (depending on fin geometry)
Thermal Resistance: 0-3 % (depending on fin geometry)
Application: Qualified Blygold Applicator
UV Resistance: Excellent
Adhesion (cross hatch): 0 (European) 5b (USA)
Applications: Heat exchanging surfaces in corrosive conditions
Chemical Resistance: Excellent
Heresite
Heresite P-413C is a thermosetting phenolic coating with high corrosion resistance and chemical inertia.
System description:
Cataforesi
Description: Electrodeposition painting
Application: Indicated as primed
Features: Excellent resistance to corrosion
Technical Data:
Black Color
– Thickness 15 – 35 μm
– Pencil hardness 2H – 3H
– Gloss 60°: 50 ± 5
– Erichsen > 4 mm
– Salt Spray according to ASTM B 117-90 – 700 hours, maximum 1 – 2 mm creep (zinc phosphate)
– Humidity Resistance according to ASTM D 2247-68 – 2000 hours unchanged (zinc phosphate)
– Resistance against according to DIN EN ISO 2812-4
Hydraulic oil
Motor oil
Gasoline
Liquid brake
Coolant
Diesel
Warnings
– This type of coating has poor resistance to UV exposure, so it is not suitable for exposure to direct sunlight.
– Resistance to Salt Spray is heavily influenced by:
Type of material;
Shape of the article (eg. presence of sharp edges);
Performed at or above cataphoresis treatment (zinc coating, heat treatment, etc.).
Surface conditions (oil, welding, oxidation, chemical residues or other contaminants).
– The material that presents forms boxed (tubular frames or complex structures) must have the drain holes being the cataphoresis an immersion process.
– The cataphoresis is not a galvanic process which the galvanizing, but is a process of painting.
Cycle
1. Alkaline degreasing spray
2. Rinse immersion:
3. Rinse immersion.
4. Activation immersion (room temperature).
5. Immersion phosphating with zinc salts microcrystalline
6. Rinse immersion.
7. Rinse immersion.
8. Rinsing with demineralized water immersion.
9. Cathodic electrodeposition immersion (cataphoresis).
10. Rinse 1 immersion with ultrafiltrate.
11. Rinse 2 to dive with ultrafiltrate.
12. Polymerization in an oven at ~ 180°C on the work piece
Tin Plating
The process of tin plating brings back a semi polished silver-white to the treated material, an excellent weldability and a good resistance to corrosion, above all on products which are in direct contact with liquids. Being a non-toxic barrier, it is also recommended for the food industry. A nickel layer on the base metal forestalls the natural darkening of the tin (multi-layered nickel-tin process).
The maximum finned length for a completely tinned coil is approximately 5500mm.