851 Greenback Printed Circuit Board Tape
Product Data Sheet
Updated
: March 1996
Supersedes : October 1993
Product Description
A green polyester film tape
with a special conformable
adhesive which resists
plating bath chemicals.
Physical Properties
Not for specification purposes
Adhesive Type
Backing
Thickness
(ASTM D-3652)
Tape Colour
Shelf Life
Special blend of Silicone
and Rubber
Transparent polyester
100 µm
Translucent green
12 months from date of despatch by 3M when stored in the
original carton at 21°C (70°F) & 50 % Relative Humidity
Performance
Characteristics
Not for specification purposes
Adhesion to Stainless
Steel
ASTM D-3330
Tensile Strength
ASTM D-3759
2.7 N/10mm
36.8 N/10mm
Elongation at Break
ASTM D-3759
56 %
Temperature Range
Maximum
90 °C
2
Date : March 1996
851 Greenback Printed Circuit
Board Tape
Additional Product
Information
Shelf life - important to
rotate inventory.
Application Techniques
Low stretch polyester film
for machine, as well as
hand application.
Solvent clean-up of the
board is recommended to
facilitate subsequent
soldering.
Tape must be firmly
pressed down by equipment
with rubber covered rollers
or a rubber covered platen
press. Hand rolling usually
does not provide enough
pressure. A vivid outline of
the circuit leads indicates
adequate pressure was
used.
Applications
For masking printed circuit
boards during solder
stripping and precious metal
plating of fingers.
Splicing of silicone coated
papers.
FEATURES
Polyester backing.
ADVANTAGES
Reduces stretch and
recovery of tape and
associated uneven stop-off
line.
Reduces undercutting
because adhesive blocks
out solutions between
fingers.
Tape generally performs
better when no ovens are
used to heat tape and
boards.
Reduces adhesive transfer
to printed circuit board.
BENEFITS
Saves money by reducing
number of reject boards.
Thick adhesive coating.
Saves money by reducing
reject boards.
Specially designed
adhesive.
Saves energy and labour
costs.
Saves money by reducing
clean-up time.
3M is a trademark of the 3M Company.
Values presented have been determined by standard test methods and are average values not to be used for specification purposes.
Our recommendations on the use of our products are based on tests believed to be reliable but we would ask that you conduct your own tests to
determine their suitability for your applications.
This is because 3M cannot accept any responsibility or liability direct or consequential for loss or damage caused as a result of our
recommendations.
Specialty Tapes & Adhesives
3M United Kingdom PLC
3M House,
28 Great Jackson Street,
Manchester,
M15 4PA
Customer Service :
Tel 0161 236 8500
Fax 0161 237 1105
3M Ireland
3M House, Adelphi Centre,
Upper Georges Street,
Dun Laoghaire,Co. Dublin,
Ireland
©
3M United Kingdom PLC 1996
Customer Service :
Tel (01) 280 3555
Fax (01) 280 3509
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