Q: How many times can a StikNPeel™ stencil be used to rework a location?
A: StikNPeel ™ stencils are designed for single use.
Q: What thicknesses are available for the StikNPeel ™ stencil?
A: The StikNPeel ™ stencils are available for 4 (0.10mm), 5 (0.13mm) and 6mil (0.15mm) thicknesses.
Q: Is the residue left by the StikNPeel ™ stencil harmful or negative from a reliability standpoint?
A: BEST’s StikNPeel(TM) rework stencils leave no harmful residues in place on the PCB after it has been taken off of the PCB.
The testing was performed by an outside laboratory with the following as background information:
In blind testing Group "A" represented the StikNPeel(TM) samples. These samples were prepared using the StikNPeel(TM) stencil and a no clean SAC 305 solder paste alloy. The complete report can be found here.
Q: What files can BEST accept to design my customized StikNPeel ™ stencil?
A: Present the BEST staff with the mechanical datasheet of the part, GERBER drawing including the paste layer section of the site you would like to rework or a dxf or dwg file and after order entry we will let you review the stencil design prior to fabrication.
Q: How small/large can the area of my StikNPeel ™ be?
A: The smallest area would be 2 x 2mm (75 mils) and the maximum area is 2.5(63.5mm) x 2.5.
Q: What are the practical limits of this rework stenciling technique for leaded devices?
A: StikNPeel ™ stencils can be manufactured and have been tested for use for leaded devices down to 0.50mm pitch, 0.25mm aperture with 0.25mm spacing between apertures. Below these guidelines we suggest using a metal rework stencil or StencilQuik ™
Q: What are the practical limits of this rework stenciling technique for BGAs?
A: StikNPeel™ stencils can be manufactured and have been tested for use for leaded devices down to 0.50mm pitch, 0.36mm aperture with 0.14mm spacing between apertures. Below these guidelines we suggest using a metal rework stencil or StencilQuik ™
Q: What is the shelf life of StikNPeel ™ stencils?
A: If stored in optimal conditions (see datasheet) the adhesive system of the StikNPeel ™ stencil has a shelf life of 2 years.
Q: Are StencilQuik™ stencils ESD safe?
A: StikNPeel™ stencils are not treated in any way to reduce ESD. Any treatment that would change the electrical characteristics of the StikNPeel™ stencils would have a detrimental effect on the beneficial insulative qualities of the StencilQuik™ stencils. When StikNPeel™ stencils are peeled from the release liner there will be some static charge generation. The amount of static charge generation on the device is directly proportional to the speed of the liner removal amongst other variables. To keep charge generation at a minimum, remove the release liner slowly. Even though the StikNPeel™ stencil may contain a static charge, as an insulator it will not discharge to any ESD sensitive device. Once placed on the printed circuit board surface, it is possible (but highly unlikely) that it can create a charged surface that may precipitate an ESD event. If your assemblies are ESD sensitive, you may want to consider an air ionizer for the work area to neutralize any static charges present. Use a static field meter to measure the charge generated through the peeling action and apply the correct mitigation technique measuring to confirm effectiveness.
Q: What is the smallest aperture opening that can be made?
A: There is no practical limit on the aperture opening but the webbing limit (ie the distance between 2 successive openings) is limited to 0.4mm (15mils). While smaller webbing distance can be machined using a squeegee to roll the paste in to the aperture openings becomes the limit.
To place an order call BEST at 847·797·9250 or order here