ADVANTAGES
H.C. Starck Solutions high-density balance weights offer high performance, compact products for applications where space is at a premium. Based on tungsten heavy alloys with densities over 60% higher than lead’s, our balance weights empower manufacturers with small-form ballast for maximum weight in the smallest space. This allows for greater positioning flexibility and overall improvements in confined space utilization.
APPLICATION
Our tungsten heavy alloy balance weights are ideal for fine balancing and vibration control in aerospace engineering. Manufactured from the highest quality tungsten heavy alloys, our balance weights offer a non-corrosive and highest density solution to both commercial and military aircrafts. Flight control systems, rotor and propeller blades, centre of gravity adjustments, and more; H.C. Starck Solutions delivers custom-built parts for various critical components of fixed and rotary-wing aircraft.
MARKET SEGMENT
The needs of three key market segments are served by our high-performance tungsten balance weights: aerospace, defense, and industrial processing. At H.C. Starck Solutions, we understand the differing objectives and critical to quality parameters of manufacturers and process engineers in these diverse market areas. Consequently, we engineer our balance weights using a choice of tungsten alloys from two world-recognized material families (Kulite® and HPM Tungsten).
Read More: Key Refractory Metals in Aerospace Markets
Decades of refractory metals expertise stand behind our manufacturing of exceptional quality balance weight for all applications across the aerospace and defense industries, as well as industrial processing sectors.
MATERIALS
Tungsten heavy alloy (WHA) is the perfect material for high-density objectives. H.C. Starck Solutions has decades of expertise in working refractory metals into bespoke end-use net shapes that meet critical mass/shape requirements.
Our tungsten balance weights are based on a choice of alloys under the Kulite® and HPM Tungsten brands, with a density range of approximately 17.0 – 18.5 g/cm3. See the table below for a complete breakdown of the tungsten alloys available from H.C. Starck Solutions.
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Tungsten Balance Weights
H.C. Starck Solutions, a worldwide manufacturer of tungsten balance weights made of technology metals , provides high performance solutions to customers in the aviation industry. Technology metals like tungsten alloys have been the choice material for machined and fabricated products in critical aerospace applications.
Our machineable high-density tungsten alloys, with a density over 60 % higher than lead, help stabilize helicopter rotor blades and the control surfaces of ailerons, elevators, and rudder sections:
- Aircraft and Helicopter Tungsten Balance Weights
- Instrumentation Tungsten Balance Weights
- Vibration Dampening Tungsten Weights
Produced and Certified to AMS-T-21024, AMS 7725 and ASTM B777.
Customer Collaboration with Tighter Process Controls
As a vertically integrated manufacturer, we exercise tight control of all our processes from refining the raw materials to delivering high purity finished products. H.C. Starck Solutions has a unique global reach allowing for close contact and collaboration with our customers. Our experienced Research and Development department allows us to constantly be at the forefront of technological advancement and development of new products together with our partners in the industry.
H.C. Starck Solutions supplies the following tungsten alloys:
Kulite® and HPM Tungsten Alloys
H.C. Starck Solutions supplies the long established Kulite® tungsten alloys from the U.S. (Table 1) and HPM tungsten alloys from Germany (Table 2).
Table 1 – Kulite® tungsten alloys (K1700 thru K1850)
| Alloy Designation | K1700 | K1701 | K1750 | K1800 | K1801 | K1850 | |
| Tungsten content | (%) | 90 | 90 | 92.5 | 95 | 95 | 97 |
| Density | (g/cm3) | 17 | 17 | 17.5 | 18 | 18 | 18.5 |
| (lb/in3) | 0.61 | 0.61 | 0.63 | 0.65 | 0.65 | 0.67 | |
| Hardness | (Rc) | 23 | 22 | 24 | 25 | 24 | 26 |
| Ultimate Tensile Strength | (psi) | 125,000 | 110,000 | 125,000 | 125,000 | 110,000 | 120,000 |
| (N/mm2) | 860 | 760 | 860 | 860 | 760 | 830 | |
| Yield Strength | (psi) | 85,000 | 80,000 | 90,000 | 90,000 | 85,000 | 95,000 |
| (N/mm2) | 590 | 550 | 620 | 620 | 590 | 660 | |
| Elongation | % | 12 | 4 | 10 | 8 | 2 | 6 |
| Modulus of Elasticity | (psi x 106) | 45 | 40 | 46 | 48 | 45 | 50 |
| (kN/mm2) | 310 | 280 | 320 | 330 | 310 | 345 | |
| Magnetic Properties | slight | none | slight | slight | none | slight | |
| Magnetic Permeability | (µ) | >1.05 | <1.05 | >1.05 | >1.05 | >1.05 | <1.05 |
| Thermal Expansion Coefficient | (x 10-6/K) (20 °C – 500 °C) |
5.1 | 5.4 | 4.9 | 4.8 | 5.0 | 4.8 |
| Thermal Conductivity | (cgs) | .20 | .23 | .24 | .27 | .32 | .26 |
| Electrical Conductivity | (% IACS) | 11 | 14 | 12 | 15 | 16 | 16 |
| MIL-T-21014(D) | class | 1 | 1 | 2 | 3 | 3 | 4 |
| ASTM B777 | class | 1 | 1 | 2 | 3 | 3 | 4 |
Table 2 – HPM tungsten alloys
Typical properties of tungsten composite materials
| Inspection criterion |
HPM 1700 |
HPM 1710 |
HPM 1701 |
HPM 1705 |
HPM 1750 |
HPM 1750 sheet |
|
| Tungsten content | % | 90.0 | 90.0 | 90.0 | 90.0 | 92.5 | 92.5 |
| Density | g/cm³ | 17.0 ± 0.2 | 17.0 ± 0.2 | 17.0 ± 0.2 | 17.3 ± 0.2 | 17.5 ± 0.2 | 17.6 ± 0.2 |
| Hardness | HV 30 | ≤ 320 | ≤ 320 | ≤ 320 | ≤ 360 | ≤ 325 | ≤ 460 |
| Tensile strength (typical value) |
MPa | 850 | 850 | 670 | 900 | 840 | 870 |
| Minimal yield strengt | MPa | 520 | 520 | 520 | 520 | 520 | 520 |
| Elongation (typical value) |
% | 12 | 12 | 3 | 8 | 14 | 16 |
| Young’s modulus (average value) |
GPa | 320 | 320 | 300 | 330 | 340 | 340 |
| Median coefficient of linear thermal expansion 20 – 100 °C |
10-6/K | 6.1 | 6.3 | 6.0 | 4.5 | 5.5 | 5.5 |
| 20 – 300 °C | 10-6/K | 6.2 | 6.5 | 6.2 | 5.1 | 5.7 | 5.7 |
| 20 – 450 °C | 10-6/K | 6.3 | 6.6 | 6.4 | 5.3 | 5.8 | 5.8 |
| Thermal conductivity | W/mK | ≥70 | ≥70 | ≥90 | ≥70 | ≥75 | ≥75 |
| Electrical conductivity (average value) | %IACS MS/m |
11 6.4 |
11 6.4 |
14 8.1 |
13 7.5 |
12 6.9 |
12 6.9 |
| Specific electrical resistance (average value) |
µΩm | 0.16 | 0.16 | 0.12 | 0.13 | 0.15 | 0.15 |
| Permeability µ | > 1.05 | > 1.05 | < 1.05 | > 1.05 | > 1.05 | > 1.05 |
| Inspection criterion | HPM 1751 | HPM 1760 | HPM 1800 | HPM 1810 | HPM 1801 | HPM 1850 | HPM 1850W | |
| Tungsten content | % | 92.5 | 92.5 | 95.0 | 95.0 | 95.0 | 97.0 | 97.0 |
| Density | g/cm³ | 17.5 ± 0.2 | 17.6 ± 0.2 | 18.0 ± 0.2 | 18.0 ± 0.2 | 18.0 ± 0.2 | 18.5 ± 0.2 | 18.5 ± 0.2 |
| Hardness | HV 30 | ≤ 325 | ≤ 325 | ≤ 332 | ≤ 332 | ≤ 332 | ≤ 340 | ≤ 340 |
| Tensile strength (typical value) |
MPa | 690 | 870 | 830 | 830 | 700 | 830 | 890 |
| Minimal yield strengt | MPa | 520 | 520 | 520 | 520 | 520 | 520 | 520 |
| Elongation (typical value) |
% | 3 | 16 | 14 | 14 | 2 | 12 | 12 |
| Young’s modulus (average value) |
GPa | 330 | 340 | 370 | 370 | 330 | 380 | 380 |
| Median coefficient of linear thermal expansion 20 – 100 °C |
10-6/K | 5.7 | 5.5 | 4.9 | 5.2 | 5.4 | 5.1 | 4.8 |
| 20 – 300 °C | 10-6/K | 5.8 | 5.8 | 5.1 | 5.3 | 5.5 | 5.1 | 4.9 |
| 20 – 450 °C | 10-6/K | 5.9 | 5.9 | 5.2 | 5.5 | 5.6 | 5.2 | 5.0 |
| Thermal conductivity | W/mK | ≥85 | ≥75 | ≥80 | ≥80 | ≥85 | ≥75 | ≥80 |
| Electrical conductivity (average value) | %IACS MS/m |
15 8.5 |
12 6.9 |
13 7.7 |
13 7.7 |
15 9.0 |
16 9.3 |
16 9.3 |
| Specific electrical resistance (average value) |
µΩm | 0.12 | 0.15 | 0.14 | 0.14 | 0.11 | 0.10 | 0.10 |
| Permeability µ | < 1.05 | > 1.05 | > 1.05 | > 1.05 | < 1.05 | > 1.05 | > 1.05 |
Exceeds requirements of the following specifications: MIL-T-21014, ASTM B777 and AMS 7725
