SYNTETIC
RESIN-BONDED PAPER by Bulgarian
State Standard /BSS/ 5326-76
The following brands are produced from electroinsulating
paper and high-quality phenol resins with thickness
from 0.5 mm to 100 mm and size (1450 x 950)
mm.:
E - with good mechanical qualities
for normal electric load, applicable as a constructional
material in equipment and machinery construction
industry, as an insulating material in low voltage
range of electrical industry;
AE - same as brand E with better
die-stamping qualities;
E2 -
with insubstantial water-absorbing capacity
and good
electroinsulating qualities remaining in high
humidity conditions as well, making this type
of paper applicable in high-frequency and communication
equipment operating in humid climate;
E2.A - good die-stamping quality
at normal temperature, high electroinsulating
resistance and low dielectric strength under
very hard humidity conditions;
E3 - good mechanical qualities
as well as high electric strength, applicable
in high-voltage machinery for function in transformer
oil at temperatures up to 1200C;
E4 - because of its increased
electric strength parallel with the layers,
it is applicable in high-voltage machinery;
Synthetic
resin-bonded paper pads with thickness from 0.5
mm to 3.0 mm –subsidiary material for drilling
of printed-circuit boards according to Branch
Standard /BS/ 04 78187-85;
Synthetic resin-bonded paper pads on phenol base;
Synthetic resin-bonded paper pads with covering
sheets on melamine base.
The particular brands
correspond to the analogous products, made
in EUROPE according to standards
EN 60893-3-4, DIN 7735/2.
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