IEC 61249-2-12:1999 pdf download – Materials for printed boards andother interconnecting structures -Part 2-12: Sectional specification set for reinforced base materials, clad and unclad -Epoxide non-woven aramid laminate of defined flammability, copper-clad

IEC 61249-2-12:1999 pdf download – Materials for printed boards andother interconnecting structures -Part 2-12: Sectional specification set for reinforced base materials, clad and unclad -Epoxide non-woven aramid laminate of defined flammability, copper-clad.
This part of IEC 61249 gives requirements for properties of epoxide non-woven aramid copper-clad laminate of defined flammability, in thicknesses of 0,05 mm up to 6.4 mm.
NOTt To designate this material, the relerence. 61249-2-I 2-FVI-IEC-EP-AP-Cu may be used. it theme is no riSk ol contusion, the type desiQnahon may be abbreviated to read IEC-61249-2-12-FV1.
2 NormatIve references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of IEC 61249. For dated references, subsequent amendments to. or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61249 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 61189.2:1997. Test methods for electrical materials, interconnechon structures and assemblies — Part 2: Test methods for materials for interconnection structures
lEG 61249-5-1:1995, Materials for printed boards and other interconnecting structures — Part 5: Sectional specification set for conductive foils and films with or without coatings — Section 1: Copper foils (for the manufacture of copper-clad base materials)
3 MaterIals and construction
The material consists of an insulating base with metal foil bonded to one side or both.
3.1 InsulatIng base
Epoxide resin bonded non-woven aramid laminate. Its flame resistance is defined in terms of the flammability requirements of 7.3.
3.2 Metal foil
Copper as specified in lEG 61249-5-1. The preferred foils are type El (standard electrodeposited copper) of standard ductility.
4 Internal marking
Not specified.
6.6 PunchIng and machining
Punching is not applicable- The laminate shall, in accordance with the manufacturer’s recommendations, be capable of being sheared or drilled. Delamination at the edges due to the shearing process Is permissible. provded that the depth of delamination may not be larger than the thickness of the base material Delamination at the edges of drilled holes due to the drilling process is not permissible. Drilled holes shall be capable of being through-plated with no interference from any exudations into the hole.