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Backed by an exclusive 30 year unconditional guarantee Forge welded joint creates strong, clean, uninterrupted heat path Standard fin delivers superior 96.2% fin efficiency

Fins in standard 117.4mm (4.625”), or 122mm (4.81”), 143mm (5.63”), and 152.4mm (6.0”) Tubes in diameters of 12.7mm (0.5”), 10mm (0.393”) and 8mm (0.314”) hard tempered with a .5mm (0.02”) wall thickness Collar drilled to produce the finest brazed joint available

The photograph (above left) Forge Weld Joint: of a fintube cross section Because the joint (magnified 46 times) has the same shows how the high frequency forge conductivity as welding process the fin fficient solar energy provides complete material, and permanent systems rely on the optimal conductivity bonding of fin to there is no between fin and tube inside the solar tube as need to collector. For lasting performance and evidenced by the grain make the durability, the fin-to-tube joint must not only be growth joint highly conductive, but strong enough to endure across the wider the unrelenting torture of the sun’s rays. Our high joint.

Brazed with silver copper alloy for strength and durability


Lengths up to 5 meters (16’ 3/8”) 200 psi (approximately 14 bar) pressure tested

Available bare copper or coated with revolutionary Crystal Clear for superior heat absorption and retention

frequency weld ensures maximum heat transfer.

To the right All the while having no solder or crimped-seam is a photograph joints, this weld will last where others weaken showing the and fail under high temperature settings. end portion of THERMAFIN Manufacturing components an actual fintube. The perform with the highest efficiency year superimposed after year. rectangle shows the area of the magnified photograph to its left.

Unique coating enables collector(s) to reach optimum temperatures in a minimal amount of time and retain heat longer Increases solar collector efficiency due to its unique optical properties Coating is based on a single-phase nanotechnology

than the thickness of the fin. This joint is at least twice as wide as the thickness of the fin.

Reflects long wave light (emissivity > 0.08) Absorbs short-wave light (absorptivity <0.96)

Mechanical Joining Weld is not a true fused joint and the copper fin becomes weak at the seam, causing a resistance in heat flow. The fin thickness is reduced Ultrasonic at the edge of the weld where loss Weld of integrity are breakage can occur.

Solder Bonding

For solder or adhesive bonding, low thermal conductivity remains a problem. To provide sufficient heat flow from fin to tube, both a large contact area and and a thin, continuous layer of the bonding agent are necessary. This bonding agent can deteriorate with aging and thermal cycling.

Simplest in construction, but provides poor thermal conductivity. To overcome this issue the contact area must be large and the joint must be uniformly tight. As the joint ages from stresses of thermal cycling, the point of contact begins to corrode and develop a gap. This severely affects the heat transfer capability.

Integral Construction The tube and wall must be thick enough to withstand fluid pressure and prevent corrosion, whicle the absorber sheet is twice the sized of the tube wall. This results in an extremely heavy absorber plate as well as a higher cost, with only a small gain in efficiency.

Thermafin Brochure  

Promoting the leading fintube manufacturer.

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