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- A Synonym for
Quality
The name ORIGINAL BUNGARD stands for
highest quality and processing safety of presensitized laminates. Like no
other comparable product, this material allows a fast, flexible and
faultless production of PCBs in small series and prototypes.
We use first-choice laminates approved and certified by UL, NEMA,
DIN, IEC and others. Several types of laminates, i.e. FR2, FR3, CEM1, FR4
and PTFE are available in thicknesses of 0.5, 0.8, 1.0, 1.6, 2.0 and 2.5
mm with either 18, 35 or 70 microns Copper. The max. panel size is 510 x
1150 mm. Our cutting service provides sheets down to 50 x 50 mm min.
size, with an accuracy of 0.1 mm.
- Photoresist
We coat the laminates with a
special positive working liquid resist made after our own recipe. The
resist features highest exposure sensitivity, short processing turns and
large safety tolerannces. The equal and dust-free coating has a defined
thickness of 5 µm. The maximum spectral response is in the range of
350 - 400 nm. The line resolution is limited only by the type of exposure
unit. Typical exposure times are less than 90 secondes on a set with fluorescent
vacuum tubes. The resist allows multiple exposure.
Referring to our special developer, at 20 °C the developing time is
less than 45 secondes. On the other hand, the resist is absolutely stable
for more than 5 minutes in the developer. It is resistant to acid etching
or galvanic chemicals and even permits alcaline etching at a ph less than
9.5.
The boards are protected against mechanical damage
and unwanted exposure by a special, blue coloured adhesive paper. Due to
this protective paper, no flitters appear when cutting or milling the
boards.
Each board is subjected to chemical and physical
controls and tests before and after coating.
A
shelf live of more than 1 year under normal storage conditions is guaranteed.
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