Standard Practice for Specifying Thick-Film Pastes (Withdrawn 2008)

SCOPE
1.1 This practice covers the writing of specifications for thick-film pastes for electronics.  
1.2 The practice provides a guide for the routine procedure to be followed in specifying for procurement thick-film pastes for use in manufactured circuits. Specific requirements, intended applications, and test methods should be included or identified in each paste specification. In addition, each specification should include basic information to facilitate procurement, preparation, quality control, lot shipment identifications, and shipping of such pastes.  
1.3 The practice covers the development of specifications for fireable, thick-film pastes, including resistor, conductor, dielectric, and overglaze pastes.
WITHDRAWN RATIONALE
Formerly under the jurisdiction of Committee F01 on Electronics, this practice was withdrawn in June 2008 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

Status
Withdrawn
Publication Date
09-Dec-2002
Withdrawal Date
29-Jul-2008
Current Stage
Ref Project

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ASTM F508-77(2002) - Standard Practice for Specifying Thick-Film Pastes (Withdrawn 2008)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F 508–77(Reapproved 2002)
Standard Practice for
1
Specifying Thick-Film Pastes
This standard is issued under the fixed designation F 508; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.3.1.2 Drying and Leveling Characteristics—The specifi-
cationshouldstatetherangeofdryingtime,therangeofdrying
1.1 This practice covers the writing of specifications for
temperature, and the dried film (leveling) characteristics. The
thick-film pastes for electronics.
dried film characteristics may be specified by visual examina-
1.2 The practice provides a guide for the routine procedure
tion, for such defects as lifting or pinholes, and by a thickness
to be followed in specifying for procurement thick-film pastes
profile across the surface of the dried film.
for use in manufactured circuits. Specific requirements, in-
2.3.1.3 Firing Profile—The specification profile for each
tended applications, and test methods should be included or
specific style of paste.
identified in each paste specification. In addition, each speci-
2.3.1.4 Firing Atmosphere—For each style of paste and
fication should include basic information to facilitate procure-
firing profile, the specification should define the firing atmo-
ment, preparation, quality control, lot shipment identifications,
sphere.
and shipping of such pastes.
2.3.1.5 Test Substrate—The specification should specify
1.3 The practice covers the development of specifications
and identify the composition of the test substrate and the
for fireable, thick-film pastes, including resistor, conductor,
surface on which the paste is to be deposited.
dielectric, and overglaze pastes.
2.3.2 Test Pattern—Where applicable, the specification
2. Specification Form and Content shouldincludealayoutanddescriptionofasuitabletestpattern
forevaluatingprintedandfiredpastes.Thespecificationshould
2.1 Form—Each specification should be prepared in con-
2
also include a list and functions of other materials required to
formance with Form and Style for ASTM Standards.
perform the specified tests, that is, terminations, leads, etc.
2.2 Procurement Information—Information pertinent to
Consideration should be given to compatibility requirements
procurement should include the procuring organization’s
for all materials used.
name,location,address,telephonenumber,andthenameofthe
2.4 Quality Control—The specification should identify the
procurement agent, or anyone else involved in procurement or
quality control procedures to be employed. Such procedures
with the technical details of the specifications.
should include: a sampling plan, a sequence for each exami-
2.3 Technical Information—Each specification should cover
nation and test specified, and corresponding requirements for
the specific technical details, the performance requirements,
each method of examination or test.
and the precision or accuracy of measurements necessary for
2.5 Handling and Storing—Each specification should in-
the producer to supply the thick-film paste specified.
clude the method of handling and storing the pastes.
2.3.1 Processing Characteristics:
2.6 Performance Tests:
2.3.1.1 Screen Selection—The particular paste specifica-
2.6.1 Individual procurement specifications should include
tions should identify the required screen by the mesh count, the
requirements for each selected applicable test, inspection, and
wire size, and the emulsion thickness. Where metal masks are
examination listed in Table 1 and Table 2 for the given type of
to be used, the cavity thickness and the cavity-aperture
thick-film paste. The specification should include any other
tolerances should be specified. The specification should also
pertinent tests and inspections to cover special or specific
state the recommended nominal deposit thickness.
applications.
2.6.1.1 The test and inspection equipment specified should
1
This practice is under the jurisdiction ofASTM Committee F01 on Electronics
be of sufficient accuracy and quality to permit the required tests
and is the direct responsibility of Subcommittee F01.03 on Metallic Materials.
and inspections to be carried out.
Current edition approved Dec. 10, 2002. Published May 2003. Originally
e1
approved in 1991. Last previous edition approved in 1997 as F 508 – 77 (1997) .
2
AvailablefromASTM,100BarrHarborDrive,WestConshohocken,Pa.19428.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F 508–77 (2002)
TABLE 1 Paste Characterization
A
Test Applies to
Test and Examination
Resistor Conductor Dielectric Overgl
...

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