Technical Bulletin November 2021
Dispensing Guide for 3M Scotch-Weld
Two-Part Epoxy Adhesive DP420NS Black
November 2021
Uncured Properties
DP420NS Black
B A
Base Accelerator
Color Black Amber
Ratio by volume 2 1
Ratio by weight 2 0.97
Density (lb/gal) 9.4-9.8 9.1-9.5
Viscosity (cP) 190,000-270,000 60,000-130,000
Thixotropic Index 1.6 2.4
Viscosity/Rheology
*Note: Viscosity measurements done by cone and plate
Cartridge Startup
When dispensing from a cartridge level the A&B pistons at
initial set up. Material should be purged from the static mixer
until a homogenous mix between parts A&B is achieved.
Packaging
Description
45-50ml Mixpac B system
200*/400ml Mixpac C system
5-gallon pail
Straight sided
I.D. of 341.31mm x 285.75mm
55-gallon
drum
Straight Sided
603.25mm Dia x 884.22mm H
*where available
Purge Recommendation
For short purge times between runs the graph below
shows the mixed viscosity of DP420NS over time,
based on static mixer and purge volume use this
graph for a recommended purge time. For a one
component purge using bulk dispensers, purge with
DP420NS Part B.
*Note: Viscosity vs time taken at 25 C
1
10
100
1000
0.01 0.1 1 10 100
Viscosity [Pa*s]
Shear Rate [1/s]
DP420NS Part B Viscosity
15C
20C
25C
30C
35C
1
10
100
1000
0.01 0.1 1 10 100
Viscosity [Pa*S]
Shear Rate [1/s]
DP420NS Part A Viscosity
15C
20C
25C
30C
35C
DP420NS Mixed Viscosity vs. Time
Technical Bulletin
Dispensing Guide for 3M Scotch-Weld Two-Part Epoxy Adhesive DP420NS
Black
Mixing Nozzles
50ml 200/400ml
Quadro
Mix Elements:16
Length (mm):85
Volume (ml):1.88
Helical
Mix Elements:24
Length (mm): 185
Volume (ml): 4.20
Quad
Mix Elements: 20
Length (mm):126.9
Volume (ml): 5.4
Helical
Mix Elements: 24
Length (mm) 277
Volume (ml):
14.60
sku:7100148765 sku:7000046633 sku:7000028616 sku: 7000043674
Cleaning of Equipment Abrasives
Excess uncured adhesive can be cleaned with methyl ethyl No abrasive fillers are used in this material.
ketone (MEK). Follow equipment manufacturing
procedures for cleaning of their equipment.
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