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Products

Kester brings over 40 years of experience in preform manufacturing and can provide preforms in a variety of shapes, sizes, and flux types. Preforms can provide a precise volume of solder and flux to the right area at the right time for a number of different applications. The main applications include, but are not limited to, die attach, vacuum and hermetic seals and gaskets, PCB solder fortifications, connector pins and component attach, mechanical attachment, and thermal fuses. View the tables below to determine what sizes and flux types Kester offers and call a local sales representative today to inquire about technical questions and sample requests.


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Flux Recommendations

Kester offers a wide variety of flux types with activity ranges from ORH1 for difficult to solder applications down to ROL0 for applications requiring low levels of halides. We offer internal and external flux types to create the optimal solution for your product needs. Please contact technical support for additional recommendations on which flux type and flux coating will work best for your application.

Flux Description Type Class* Internal External
245S Low Residues NC ROL0 X
291S High Reliability Post Soldering Residue NC ORL0 X
290S Extremely Low Residues Low Solids ROL0 X
285 Use for Difficult to Solder Applications RMA ROL0 X X
48SF High Activity RA Formulation with Excellent Wetting and Low Smoke and Odor RA ROL1 X
44 Recommended when Soldering to Highly Oxidized Copper or Difficult to Solder Applications RA ROM1 X X
88 Highest Activity with ROM1 Type RA ROM1 X
435 High Activity Water Soluble Flux WS ORH1 X

*J-STD-004A


Preform Dimensional Offerings

Kester preforms can be processed in a wide range of dimensions. Please view the table below for our standard dimensional offerings and tolerances. If the required volume and dimensions of your preform are unknown please call your local Kester sales representative to assist you in the calculation of these values.


preform ribbons Ribbons

Dimensions Tolerance
W .050" - 2.5" (1.27 - 63.5mm) ± .005" (.127mm)
t .005" - .060" (.127 - 1.52mm) ± .002" (.050mm)

preform cut-offs Cut-Offs

Dimensions Tolerance
W .028" - .250" (.7112 - 6.3mm) > .250" (6.35mm) ± .003" (.076mm) ± .005" (.127mm)
L .500" (12.7mm) > .500" (12.7mm) ± .003" (.076mm) ± .005" (.127mm)
t .004" - .125" (.102 - 3.1mm) ± .002" (.050mm)

preform washers Washers

Dimensions Tolerance
OD .030" - 1.0" (.762 - 25.4mm) ± .002" (.050mm)
ID .015" - 0.93" (.381 - 23.6mm) ± .002" (.050mm)
t .004" - 0.95" (.102 - 24.1mm) ± .002" (.050mm)

preform discs Discs

Dimensions Tolerance
D .020" - .250" (.508 - 6.35mm) ± .002" (.050mm)
t .004" - .012" (.102 - .305mm) ± .002" (.050mm)

preform pellets Pellets

Dimensions Tolerance
d .010" - .585" (.254 - 14.8mm) ± .003" (.076mm)
L 2" (50.8mm) ± .003" (.076mm)
2 - 6" (50.8 - 152.4mm) ± .010" (.254mm)
6 - 10" (152 - 2520mm) ± .020" (.508mm)

Stampings

As stampings require customized tooling please contact your local sales representative today to discuss your product needs.