PRINTED WIRING BOARD
RIGID-FLEXIBLE LAMINATE
rigid flexible laminate
RIGID-FLEXIBLE LAMINATE

Rigid-Flexible Laminate (Rigid-flex) incorporates two printed wiring board technologies (rigid and flexible), allowing the development of rigid printed boards with flexible printed board interconnects, which allow the system to be bent and folded, or stacked, in three-dimensional (3-D) configurations.

See Section 5.01 "Printed Wiring Board, General Requirements", through 5.03 "Printed Wiring Board, Flexible Laminate" for common accept/reject criteria.

flexible and rigid circuits flex laminate aligned to printed laminate

PREFERRED

GENERAL

Flexible and rigid circuits are clean, smooth, of uniform thickness and free of damage. Solderable surfaces are clean and bright. Markings are legible and properly oriented.

PREFERRED

RIGID/FLEX REGISTRATION

The flex laminate is perfectly aligned and registered to the printed laminate.

Best Workmanship Practice

transition zone flex and rigid registration

PREFERRED

TRANSITION ZONE (T)

The transition zone between the rigid and flexible laminates is smooth, of uniform thickness and free of damage, deformation or contaminants.

Best Workmanship Practice

ACCEPTABLE

RIGID/FLEX REGISTRATION

The flex laminate is aligned and registered to the printed laminate within engineering specification.

Best Workmanship Practice

NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
5
Section:
5.04
Page:
1




PRINTED WIRING BOARD
RIGID-FLEXIBLE LAMINATE (cont.)
transition zone imperfections transition zone imperfection and adhesive prepreg squeeze out

ACCEPTABLE

TRANSITION ZONE IMPERFECTIONS

Minor visual imperfections inherent to the fabrication process (i.e., adhesive squeeze-out, localized deformation of the dielectric and conductors) shall not be cause for rejection.

Best Workmanship Practice

UNACCEPTABLE

TRANSITION ZONE IMPERFECTIONS
ADHESIVE/PREPREG SQUEEZE OUT

The squeeze-out of adhesive/prepreg shall not extend beyond the transition zone and shall not interfere with the designed flexing of the flexible laminate.

Best Workmanship Practice



















NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
5
Section:
5.04
Page:
2





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