Based on the provided references, calculating solder paste volume involves determining the physical dimensions of the deposit, although the references primarily illustrate how to use a known volume to calculate the mass of the paste deposit.
The references include examples and formulas that touch upon solder paste characteristics and calculations, including a specific volume figure used in a mass calculation.
Understanding Solder Paste Calculations from References
The provided information demonstrates a calculation starting with a known volume of solder paste. It shows how to convert this volume to a different unit and then use the paste's density to find its mass.
One calculation example given is:
0.000000576 inches3 * 4.14gm/cm3 = 0.000009439cm3 * 4.14gm/cm3 = 0.0000391gm
This example illustrates the process of calculating the mass of a solder paste deposit, given its volume and density.
Let's break down the steps shown in this calculation:
- Starting Volume: A volume is given in cubic inches:
0.000000576 inches3. - Density: A density is provided in grams per cubic centimeter:
4.14gm/cm3. This density is characteristic of the solder paste material, such as SAC305 mentioned in the references. - Volume Conversion: The volume in cubic inches is converted to cubic centimeters:
0.000000576 inches3is converted to0.000009439 cm3. This step is necessary because the density is given in cm³, and units must match for calculation. (Note: The conversion factor is approximately 1 inch³ ≈ 16.387 cm³). - Mass Calculation: The converted volume in cm³ is multiplied by the density in gm/cm³ to yield the mass in grams:
0.000009439cm3 * 4.14gm/cm3 = 0.0000391gm.
This calculation shows that having the volume is crucial for determining the mass of a solder paste deposit. While the references show a volume number and how to use it, they do not detail the method used to obtain that initial volume (0.000000576 inches3). Typically, solder paste volume is calculated based on the dimensions of the stencil aperture and the stencil thickness.
Solder Paste Characteristics Mentioned
- Solder Paste Type: An example paste type mentioned is SAC305 Indium8. This specifies the alloy composition (SAC305 - Tin, Silver, Copper with 3% Silver and 0.5% Copper) and potentially the flux type or manufacturer (Indium8). The specific composition affects the paste's density.
- Greely Formula: The references mention "The Greely Formula: Alloy Specific Gravity * Flux Specific Gravity". Without further context from the references, the application of this formula specifically for calculating paste volume is unclear. It might relate to calculating the overall paste density based on the proportions and specific gravities of its components (solder alloy powder and flux/vehicle).
Summary of Volume Usage in References
The references demonstrate that once the volume of a solder paste deposit is known, it can be used in conjunction with the paste's density to calculate the mass of that deposit.
| Parameter | Value (from Reference) | Unit | Role in Calculation |
|---|---|---|---|
| Volume (Initial) | 0.000000576 | inches³ | Starting point for calculation |
| Volume (Converted) | 0.000009439 | cm³ | Volume in matching units for density |
| Density | 4.14 | gm/cm³ | Material property (e.g., for SAC305) |
| Calculated Mass | 0.0000391 | gm | Result of Volume * Density |
In conclusion, based strictly on the provided references, the method for calculating solder paste volume itself is not explicitly described. However, the references clearly show how a known volume is used with solder paste density to calculate the mass of the solder paste deposit.
