Achieving Uniform Solder Bondline Thickness
InFORMS® are reinforced solder preforms that help maintain the required bondline and promote good solder wetting. During the soldering process, the copper does not melt, ensuring that the bondline is maintained across the entire solder joint. This results in:
- Improved mechanical and thermal reliability
- Uniform bondline thickness
- Low-voiding performance
In testing, InFORMS® have shown to improve the reliability of the interconnect to at least 3500 thermal cycles, which exceeds the typical reliability specification of 1500 passive thermal cycles for -55/+150 °C.
InFORMS® offer dramatically improved handling when compared to conventional solder alloys or indium-based sheets, foils, ribbons, or large preform materials. InFORMS®® also offer increased tensile and compressive strength via the substrate materials, while retaining the unique attributes of the outer layer metal (e.g., the softness, ductility, and other advantages of indium).
InFORMS® provide engineers with an enhanced material for the development of new, or the improvement of existing, applications. They can be used in cryogenic or vacuum seals, EMI and RFI shielding, ground straps, stand-offs, thermal mismatch devices, or backplane assembly washers. While a number of metals may be used, indium metal should be considered for many applications because of its unique attributes. For example, indium readily wets glass, quartz, and glazed ceramics. When compared to conventional solders, indium-based solders significantly reduce scavenging and leaching of gold and other precious metals.
Substrates and Outer Layer Metals
InFORMS® can be produced from a wide range of metal and non-metal substrates, depending on the needs of the application. Please contact our Technical Support Engineers if you would like us to work with you to develop samples for experimentation, including special substrate materials, layer thicknesses, or outer layer metallizations.
In applications where the metal meets in the substrate matrix, metals used on outer layers may be dissimilar, as long as they are compatible with each other. Where the application does not require cold welding of the outer layers, the layers may also be dissimilar. In either case, compatibility with the substrate material must be considered in applications development. Contact Indium Corporation at email@example.com for advice or additional questions.
InFORMS® can be produced in a variety of standard and custom shapes. Dimensional tolerances can be held to those normally specified for standard solder preforms, but may vary depending on the part size, thickness, substrate, and outer layer materials. Please contact us if you have special requirements.
|Solder Preform Requirements|
|Description||Standoff (Microns)||Part Dimensions
(x and y) (Millimeters)
|LM04||100||>10 per side||>150|
|LM06||150||>10 per side||>200|
|LM08||200||>10 per side||>250|
|SM04||100||2.5-10 per side||>150|
|ESM03||75||.75-2.5 per side||>125|
|ESM02||50||.75-2.5 per side||>100|
Save time and money with InFORMS® – an innovative solution that maintains uniform solder bondline thickness.
- Reduce voiding
- Improve reliability
- Enhance soldering performance
Thermal Interface Materials Technical Documents
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