3M 851

Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium

3M 851

Main features

  • 4.0 Mil Tape Construction
  • Low-Stretch Polyester Backing
  • Undercut-Reducing Adhesive Coating

Product Description

3M Greenback Printed Circuit Board Tape 851 is a green polyester-film tape with a blended silicone-and-rubber adhesive for printed circuit board plating and high-temperature masking. The 4.0 mil total construction combines a low-stretch backing with a thick adhesive coating. Reduced backing stretch and recovery help form even stop-off lines, while the coating blocks plating solution between circuit fingers to reduce undercutting. For circuit-board processing, the adhesive generally performs better when the tape and boards are not heated in an oven. The tape masks circuit-board contact areas during electroplating and is removed after the masking operation.

Key features

  • 4.0 mil total construction: The green polyester backing carries a blended silicone-and-rubber adhesive coating.
  • Low-stretch stop-off masking: Limited backing stretch and recovery help keep the masked plating boundary even.
  • Plating-solution barrier: The thick adhesive coating blocks solution between circuit fingers to reduce undercutting.

Applications

Printed circuit board masking; circuit plating; other high-temperature masking applications.

Product Family

3M 851

Loading pricing…
TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
Translucent green
Total Thickness
Total thickness is taking into account all the films, coatings, adhesives, release liners and special layers and is the maximum thickness of a film or tape.
100 μm
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
124 %
Tensile Strength (Thin Film)
Tensile strength determines the resistance of a material to break under tension and it measures how much elongating load (or tensile stress) it can handle before fracture. To make it simple, it measures how much force we have to apply when pulling apart a material before it breaks.
36.8 N/cm
Other Properties
Storage Temperature
16-27 °C

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers