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IPC 4202 Document Information:
Title
Flexible Base Dielectrics for Use in Flexible Printed Circuitry
IPC-Association Connecting Electronics Industries
Publication Date:
May 1, 2002
Scope:
This standard establishes the classification system, the qualification
and quality conformance
requirements for flexible base dielectric materials to be used for the
fabrication of flexible
printed circuitry and flexible flat cable.
This specification supersedes IPC-FC-231C and the requirements herein
meet or exceed the
requirements for Class 3 in this superseded document. Note that
conformance to Class 3 met or
exceeded conformance to Classes 1 and 2. IPC-4202 no longer utilizes
the 3-class system.
Classification System The system described in 1.1.1 through 1.1.2.4
identifies flexible base
dielectrics.
Nonspecific Designation A nonspecific designation is intended for use
by designers on master
drawings to designate their material choice. Further specification
details may be indicated by
using the specific designation in drawing notes and purchase
documents. At the end of this standard
is a series of material specification sheets designated by individual
nonspecific designators. Each
sheet outlines engineering and performance data for a flexible base
dielectric, indicating base
material type and method of reinforcement. The sheets are provided
with a number for ordering
purposes. For example, if a user wishes to order from specification
sheet number 1, the number "1"
would be substituted for the "S" in the designation example (i.e.,
IPC-4202/1).
Example of nonspecific designation:
IPC-4202/S
Where S is specification sheet number
Specific Designation The specific designation shall be in the
following form and is intended for
use on purchase orders (see 6.1). The specific designation shall not
be used by designers on master
drawings to indicate their material selection. Master drawings shall
indicate the material design
by the nonspecific designation supplemented in notes with the material
specification details as
defined by the specific designation. This procedure is necessary
because the specific designation
is normally lengthy and will not fit the field for most computer
cataloging.
Example of specific designation:
IPC-4202/S -C1E2
Where:
IPC-4202/S - Nonspecific Designation (see 1.1.1)
C - Base Dielectric Type Designation (see 1.1.2.1)
1 - Reinforcement Method Designation (see 1.1.2.2)
E - Reinforcement Type Designation (see 1.1.2.3)
2 - Base Dielectric Thickness Designation (see 1.1.2.4)
Base Dielectric Material Type The type of dielectric material shall be
designated per Table 1-1.
Reinforcement Method The reinforcement method shall be designated per
Table 1-2.
Reinforcement Type The reinforcement type shall be designated per
Table 1-3.
Base Dielectric Material Thickness The base material thickness shall
be designated per Table 1-4.
Qualification The flexible base dielectrics materials that meet all
the requirements of this
standard shall be qualified products (see 4.8).
Quality Conformance This standard establishes a quality conformance
system for the manufacturers to
demonstrate the continual conformance of a flexible base dielectrics
material to the quality
requirements of the standard. See 4.9 for quality conformance
inspection requirements.
Material Characteristics The flexible materials made to this standard
use established requirements
to enable the material to be applied in a broad range of applications.
Materials made to this
standard may have characteristics that meet a specific enhanced
performance need. Both the user and
supplier should review these enhancements.
New Materials The flexible base dielectrics contained in this standard
represent known materials.
As new materials become available, they will be added to future
revisions. Users and material
developers are encouraged to supply information on new flexible
materials using the blank
specification sheet at end of this standard for review by the IPC
Flexible Circuits Committee
(D-13). Users who wish to invoke this standard for flexible materials
not listed shall list a zero
for the specification sheet number (i.e., IPC-4202/0).
New or revised specification sheets may become approved by the
committee independent from revision
of the standard. When this occurs, the new or revised specification
sheet shall become part of the
standard. Per 6.1, the specification sheet revision date shall be
specified in the order.
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