We provide the palette of precious metals
that will act as the canvas, color and texture

in your works of musical art!



Symphonic Flute Manufacturers are a rare breed of artists. As a painter needs a canvas on which he can create his art and a palette from which color and texture can be added, flute makers require gold and platinum materials of varying colors, densities and dimensions in order to create the tonal coloring and textures that they envision will create the perfect flute.

Acoustalloy™ Metals

Nordt Engineered Precious Metals is a primary source of precious metal flute body, tone hole, ring and barrel tubing as well as flute parts such as end rings, boxes and barrels. All of our Acoustalloy™ products are manufactured using our proprietary FusionForged® technology to ensure maximum density and optimum material characteristics. No other manufacturer can offer this technology.

Flutes - before and after

             Before                               After                                 Your Finished Product

This process is instrumental in achieving the optimum properties of our Acoustalloys™. Although generic extrusion processes are used in many industries, only Nordt Engineered Precious Metals has successfully applied the technique to non-ferrous metals susceptible to “hot short” behavior. The process utilizes hydro-dynamic pressures approaching 450,000 pounds per square inch, which must be carefully applied to achieve the necessary controlled deformation rates. Because the entire process utilizes symmetrical flow at high pressures, metals are compressed to maximum theoretical densities, free of porosity or defects, and exhibiting uniform grain structure and optimal mechanical properties. This same process allows Nordt to metallurgically bond two or more metals in order to manufacturer multi-metals or clads.

Flute Manufacturers Require the careful control of the following issues:

Inside Diameter
Calibrated Plug Gauges

Inside Diameter
Tubes are manufactured to within +.0005 / -.00025 inch tolerance of the target diameter. Precision calibrated plug gauges are used to ensure that the ID of each tube conforms to specifications. A plug .00025 inches smaller than the target ID can be easily placed in the tube but a plug .00075 inches larger than the target ID should not fit.

Head Joint tubes are heat treated to achieve a level of softness and ductility that allows for an easy taper. Science tells us that applied heat can create the tendency for the material to collapse and make the tube less round. This change in roundness is controlled by Nordt Engineered Precious metals through the use of innovative manufacturing techniques.

Wall Thickness / Concentricity
Tubes are manufactured to within + or - .0005 inches of the target wall dimension as measured at 3,6,9 and 12 o’clock. To accurately perform this test, a micrometer with a rounded anvil should be used.

Inside Diameter
Granite Surface Plate

We recommend that straightness be measured with reference to a calibrated granite surface plate. The tube should be placed gently on the surface plate and carefully rotated while using calibrated “shim stock* to measure the “bend or bow” over the length of the tube. The maximum bow should not exceed .00075” per linear inch.* A “feeler gauge” can be used in place of the calibrated shim stock.

Surface Condition

Nordt’s FusionForged® process produces porosity-free precious metal tubing with metallurgical properties optimized for the discriminating manufacture of precious metal flutes. Nordt is careful to keep tooling in a clean condition so that surface blemishes are not introduced into the material.

Hardness and Ductility
Micro Hardness Tester
Hardness and Ductility
Tubes are manufactured to within + or – 10DPH* of the target hardness. Nordt measures hardness using a highly specialized Micro Hardness Tester. We can deliver to specified hardness ranges appropriate for flute body and head joint tubing. Flute makers should be advised that as they apply heat and otherwise cut and polish these tubes, hardness levels and ductility may be affected.
*DPH refers to Diamond Pyramid Hardness, sometimes referred to as “Vickers” hardness.

Heat TreatmentHeat Treatment
Proper heat treatment should remove any residual or internal stresses that are the result of the processes used to manufacture the tube. This will make it less likely that the tube part will become bowed or otherwise deformed as the tube is processed by the flute maker. Heat treatment does not prohibit the flute maker from causing bowing or other deformation as the piece is heated and otherwise hand worked; it simply does not add to the problems the flute-making process can introduce.

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