Hubei Fotma Machinery Co., Ltd.
| Payment Terms | T/T, L/C, Western Union, PayPal |
| Supply Ability | 10000pcs/month |
| Delivery Time | 20-25 days after deposit |
| Packaging Details | Paper cartons or plywood boxes |
| W Content | 30% - 85% |
| Ag Content | 15% - 70% |
| Sizes | Customized |
| Density | 12 - 17g/cc |
| Surface | Polished, Ground |
| Tolerance | +/-0.05mm |
| Brand Name | FOTMA |
| Model Number | AGW |
| Certification | ISO9001:2008 |
| Place of Origin | P.R. China |
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Product Specification
| Payment Terms | T/T, L/C, Western Union, PayPal | Supply Ability | 10000pcs/month |
| Delivery Time | 20-25 days after deposit | Packaging Details | Paper cartons or plywood boxes |
| W Content | 30% - 85% | Ag Content | 15% - 70% |
| Sizes | Customized | Density | 12 - 17g/cc |
| Surface | Polished, Ground | Tolerance | +/-0.05mm |
| Brand Name | FOTMA | Model Number | AGW |
| Certification | ISO9001:2008 | Place of Origin | P.R. China |
| High Light | 17g/cc Silver Tungsten Carbide Heat Sinks ，Copper Tungsten Heat Sinks ，Erosion Resistance Silver Tungsten Carbide | ||
Tungsten Products Silver Tungsten Alloy Heat Spreaders For LED Industry
Silver tungsten alloy has proven to be an excellent material because of its ability to resist contact "sticking" or welding and also because of its resistance to oxidation.
Silver tungsten alloys, also known as silver tungsten carbides, are used in industrial and domestic circuit breaker applications where good weld and erosion resistance is important.
The high silver grades have higher conductivity, and the high tungsten grades have greater erosion and weld resistance. High contact pressures are required to ensure effective operation if used for frequent high current switching, and mixed oxides of silver tungsten can be formed to give high contact resistance.
Application of Silver Tungsten:
Silver tungsten alloys contain between 15-70% silver.
They are mainly used for electrical contacts—generally heavy-duty devices subject to high current,
such as moving contact for circuit-breakers between 100 and 800 A, earth leakage breakers, moving contact for air circuit breaker between 1000 and 10000 A, thermostats, miniature circuit breakers, arcing contact for large size contactors, moulded-case circuit breakers and heavy-load AC/DC contactors, etc.
Technical Parameters of Silver Tungsten:
| Material Nominal Composition | Density g/cm³ | Hardness HV10 | Electrical Conductivity %I.A.C.S | m/ mm² |
| WCAg 35 | 13.0 | 170 | 35 | 20 |
| WCAg 50 | 12.2 | 150 | 39 | 22 |
| WCAg 60 | 11.7 | 140 | 42 | 24 |
Specifications of Silver Tungsten Alloy:
| Name | Chemical Symbol | Chemical Composition(%) | Physical and Mechanical Properties | ||||
| Ag | Impurity | W | Density/ | Hardness | Resistivity | ||
| Silver-tungsten (30) | AgW (30) | 70±1.5 | ≤0.5 | Allowance | 11.75 | 75 | 2.3 |
| Silver-tungsten (40) | AgW (40) | 60±1.5 | ≤0.5 | Allowance | 12.4 | 85 | 2.6 |
| Silver-tungsten (50) | AgW (50) | 50±2.0 | ≤0.5 | Allowance | 13.15 | 105 | 3 |
| Silver-tungsten (55) | AgW (55) | 45±2.0 | ≤0.5 | Allowance | 13.55 | 115 | 3.2 |
| Silver-tungsten (60) | AgW (60) | 40±2.0 | ≤0.5 | Allowance | 14 | 125 | 3.4 |
| Silver-tungsten (65) | AgW (65) | 35±2.0 | ≤0.5 | Allowance | 14.5 | 135 | 3.6 |
| Silver-tungsten (70) | AgW (70) | 30±2.0 | ≤0.5 | Allowance | 14.9 | 150 | 3.8 |
| Silver-tungsten (75) | AgW (75) | 25±2.0 | ≤0.5 | Allowance | 15.4 | 165 | 4.2 |
| Silver-tungsten (80) | AgW (80) | 20±2.0 | ≤0.5 | Allowance | 16.1 | 180 | 4.6 |
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Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2004
Total Annual:
5000000-8000000
Employee Number:
50~100
Ecer Certification：
Active Member
Hubei Fotma Machinery Co.Ltd established in 2004 as a combined group engaged into manufacturing and exporting of Non-Ferrous Metals, Agricultural Machinery and Instruction Machinery etc. In 2005, our factory established in Zigong, Sichuan P.R., which is a professional manufacturer of ... Hubei Fotma Machinery Co.Ltd established in 2004 as a combined group engaged into manufacturing and exporting of Non-Ferrous Metals, Agricultural Machinery and Instruction Machinery etc. In 2005, our factory established in Zigong, Sichuan P.R., which is a professional manufacturer of ...
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