IEC 61249-4-1:2008

FOREWORD
1 Scope
2 Normative references
3 Materials and construction
  3.1 Reinforcement
  3.2 Epoxide resin
4 Properties
  4.1 Properties related to the appearance of the prepreg
      4.1.1 Dewetted areas (fish eyes)
      4.1.2 Broken filaments
      4.1.3 Distortion
      4.1.4 Creases
      4.1.5 Edge conditions
  4.2 Properties related to B stage prepreg
      4.2.1 Resin content
      4.2.2 Treated weight
      4.2.3 Resin flow
      4.2.4 Scaled flow thickness
      4.2.5 Melting viscosity
      4.2.6 Gel time
      4.2.7 Volatile content
  4.3 Properties of prepregs after curing to C stage
      4.3.1 Electric strength
      4.3.2 Flammability
      4.3.3 Relative permittivity and dissipation factor
      4.3.4 Cured thickness
5 Delivery form
  5.1 Rolls
  5.2 Sheets
  5.3 Cut panels
6 Quality assurance
  6.1 Quality system
  6.2 Responsibility for inspection
  6.3 Qualification inspection
  6.4 Quality conformance inspection
  6.5 Certificate of conformance
  6.6 Safety data sheet
7 Packaging and marking
8 Shelf life
9 Ordering information
Bibliography

IEC 61249-4-1:2008 gives requirements for properties of prepreg that is mainly intended to be used as bonding sheets in connection with laminates according to IEC 61249-2-7 when manufacturing multilayer boards in line with IEC 62326-4. This material may be also used to bond other types of laminates. Prepreg according to this standard is of defined flammability (vertical burning test). The flammability rating on fully cured prepreg is achieved through the use of brominated fire retardants contained as an integral part of the polymeric structure. After lamination according to the supplier's instructions, the glass transition temperature is defined as being 120 °C minimum.