Greetings Riston users,                          rcsradio.com.au

OK, for 30+ years I have NOT used this developer/stripper combination
mainly because of cost, as for us, in bulk manufacturing, a saving of 10 
dollars per hundred square foot, is something to be always considered.

Now this is page 1 of 2 sections, Developer and Stripper.

DEVELOPER  (CCRD600M or CCRD5000)                   September 10 2001

Why should you use this Developer, and not the more common industrial
circuit board developer, well, the simple reason is you only have
1 or 2 pieces of pre-coated board, where-as we have normally 100's 
and if we under/over develop a blank on our automatic machines, no big 
deal as the holes are already in, so we simply strip, and re-apply the
'riston' coating, expose for a few seconds (using 2 x 3kw UV lamps)
and re-run the boards through again, now you, the hobbiest do NOT have
this luxury ability of strip/re-laminate, hence you need a well proven 
method of developing etc. Doug Rees of Circuit Comps of Bexley has made 
this brew, (and now under his guidance, I do the same also), and 
several of my friends, commented that the 'edge' line when blown up 100x
on a large optical microscope, this solution gives about a 2x sharper edge.
Not required, says you, but on 10thou tracks, oh yeh ?? very handy.

On most reasonable 30-50 thou track home brew boards, maybe not needed or
required, but try putting some thin 10 thou tracks between normal IC pads, 
then see, or put 4 to 5 thin tracks down the middle of a DIP 8,14,16 etc.

We batch/sell this in 600ml and 5litre plastic handy carry bottles, 
(why 600ml, well we purchased so called 500ml plastic bottles and when
filled with 500ml of solution, it was about 3/4" (19mm) from top neck
and rather than it look like you are being 'short changed' we make it 
600ml, (and charge you extra), as we will NOT add water, to build it up. 

Room lighting has to be UV free, use Yellow Cellophaned 20w fluro's or
25w incandescent lamps with dimmers set at 1/2 way point.

Normal Exposure under 2x or 3x UV 05 lamps, by your well proven exposure 
times of 30 seconds to 50 seconds about 6" (150mm) gives excellent 
exposure through glass then clear part of negative onto Riston AE, board.

Be carefull of many so clear plastic vacumm for top layers as they do use
several UV blocking agents in the plastic to stop 'brittle-isation'and 
you will get spasmodic, very poor exposures, even if 10x exposure time.

Infrared tranmissive maybe, but NOT Ultra Violet permissive.

The Developer does NOT need to be 'warmed' up, as normal room temperature
some 20ºc to 30ºc  is quite satisfactory. Remove Clear 1 thou Oxygen Barrier
film, discard properly, then brush over surface until unwanted areas of 
copper are REMOVED, and the board is now showing shiny copper, where you 
want etched away and it must have no visible 'clouds' of resist present.

Tip the solution back into a 'B' bottle, and re-use until develop time has
been extended far too long, and/or mildly warm up to a MAX of 40ºc.

Normal develop time, according to our in house testing conditions is 5mins

Rinse in water quickly, pad dry, 'DALO',knife touch up, now etch.

This page may expand as I get feed back of any drama's

Bob Barnes - RCS Design  41 Arlewis st.  CHESTER HILL  2162  NSW  AUSTRALIA
Tel. (o2) 9738-0330   Fax. (o2) 9738-0334    http://www.rcsradio.com.au

ok, nothing to add here, other than the fact it is an excellent developer, 
but it is not re-usable after 'saturation' has been accomplished.

I suggest, you use this dev solution, then re-bottle it into a 'B' bottle
and yes, by extending time and increasing temperature, you can get a longer
life of useage, but over all, it is important to have the best 'developer'
possible, as this is the front line attack on your UV exposed Riston Board,
so by being a tad cautious on the reality useage of this product will ensure
that you get excellent 'prototypes'. 

If you need to, you can purchase this solution from us here at RCS, but we 
recommend JAYCAR as they are the more spread around representive retailers.

* STOP PRESS : WE NOW SELL A 'STRONGER' DEVELOPER, AND IT IS 2:1 
BE OFFERING DILUTION INSTRUCTIONS: STAY TUNED: AFTER SEPTEMBER 1 2002