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- Dry
Peel
is, as its name suggests, a film that needs no wet processing.
Each sheet consists of a compound of two films with an UV active adhesive
in between. The thicker of both films is 0.1 mm thick and has 2 µm
aluminium coated surface.
Under UV exposure, the
adhesive sticks to both the aluminium coating and to the surface of the
thinner, blue shinning film.
After exposure, the two
films are simply seperated by pulling them apart. The thicker one will
show the positive, the second one the negative of the artwork.
Dry peel reproduces at a very high contrast. It even allows to make
fine copies from drawings on white paper or from laser copier films.
As given by the principle of transferring the aluminium
coating, no gray shades at all can appear.
Exposure is done on standard UV exposure units with the light passing through
the original artwork onto the the blue shining side of the film.
Exposure time on our HELLAS unit is
about 2 minutes for copies from paper artwork.
There is also a white-opaque polyester film available that we call diffusor
film. I may be used with a laser printer and then serves as an artwork for
DRY PEEL.
- Stripper
for positive and negative photoresists
This product mainly consists of caustic soda. It helps removing positive
as well as negative photoresists from the PC boards. Compared to stripping
with solvents, it gives you two main advantages: Less appearance of odours
and safe and entire removal of any organic rests on the board which could
spoil subsequent wet processing steps. After the PCB was stripped, it is
rinsed under tap water and being neutralized. As a side effect, all traces
of etching liquid and copper will be removed from the board and from the
final rinse water. Use 50 g/litre of water to prepare a stripper for positive
presensitized boards.
- Special
developer for positive presensitized boards
This developer ensures to get best results with our presensitized boards.
It comes in special safety bags. The contents of one bag should be dissolved
in 1 litre of water at room temperature. This will be sufficient for approx.
0.6 m² of presensitized boards. The shelf lilf of the powder is
nearly unlimited, the liquid developer can be stored for some weeks in
closed bottles, but only for a few hours in an open tray.
- Special
developer for ALUCOREX
This developer concentrate is specially set up to give best
results with the ALUCOREX labelling system. The product comes in clear
plastic bags which are to be dissolved in one litre of water at room
temperature.
- Developer
for negative presensitized boards
Negative
aquaeos alcaline laminates are normally developed in a 1-2 % solution of
sodium carbonate. Also our negative developer consists of this chemical.
It is supplied in bags for 1 and for 10 litres of water, according to
development in a tray or in a machine.
- Sodium
persulfate
This product is recommended for use in
tank etchers. The work temperature should be 40 - 50 °C. The copper
capacity is limited to less than 30 g/l due to the long etching time.
- Ferric
chloride
We recommend to use this product in our machines. It is
offered in two forms: As a 98% concentrate powder called sublimate or as
a 56% concentrate granulate. The first is of course more efficient in
set-up but it tends to become very hot when it gets into contact with
water. Both solutions have more than 50 g/l copper capacity and etching
rates of about 30 down to 10 µm/minute.
Set-up: Dissolve
350g of sublimate in 1 litre of cold water using a heat proof container
and stir with a non-metalic tool (Never set-up in the etching machine!).
Or dissolve 800g of granulate in 1 litre of water at 40 °C to obtain
1.4 litres of etching solution. Performance will be best at about 40-50 °C,
but other than sodium persulfate, etching can be done even at room
temperature. Ferric chloride tends to deposite a mud of copper chloride.
This can be overcome by adding small portions of chloric acid to the used
(never to the fresh!) liquid.
- Stain
remover RX 3
This
organic chemical comes as a white powder to be dissolved in water. It
removes all ferric chloride stains from clothes and from sufaces. Mix 1
part of powder with 2 parts of water (dissolves better in warm water) and
apply to the stainy piece. Rinse with tap water. Clothes must be machine
washed afterwards!
- Immersion
tin SUR-TIN
SUR-TIN is an electroless immersion tinning system which
protects the PCB copper surface and which increases solderability. After
only 2 minutes of application, a shiny and clear tin layer is deposit on
the copper. Afterwards, rinse with hot water and dry with a paper cloth.
Set-up: Dissolve one after the other all three components in 2.5 l of warm
water. Store the solution in an air-tight, dark bottle. It can be re-used
several times and lasts for more than 2 m² of PCBs.
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