HMC Electronics EM828 User Manual

EnviroMark

EnviroMark

TM

TM

828

828

Low-Voiding Lead-Free Water-Soluble Solder Paste

Low-Voiding Lead-Free Water-Soluble Solder Paste

Product Description

Kester EnviroMarkTM828 is a lead-free, water-soluble
solder paste formulated specifically to reduce
voiding behavior that is common with lead-free
solder paste products. EM828 represents a
break-through in water-soluble solder paste
technology with the combination of low voiding,
excellent wetting behavior and ease of cleaning.
Additionally, EM828 is extremely stable in the
stencil printing process, regardless of print speed,
idle time and throughput. EM828 provides
tremendous wetting to a wide variety of board and
component finishes in order to simplify your
transition to lead-free processes.

• Low-voiding underneath area array components

• Excellent wetting on a variety of metallizations

• Residues are easily removed in hot DI water

• Long stencil life and tack time (process
dependent)

• Tremendous brick definition and slump resist-
ance for reduction of bridging defects

• Print speed up to 150 mm/sec (6 in/sec)

• Capable of breaks in printing of up to 60

minutes without any kneading

• Classified as ORH1 per J-STD-004A

Standard Applications

89.5% Metal – Stencil Printing

89.5% Metal – Enclosed Head Printing

RoHS Compliance

This product meets the requirements of the RoHS
(Restriction of Hazardous Substances) Directive,
2002/95/EC Article 4 for the stated banned
substances.

Physical Properties

(Data given for Sn96.5 Ag3.0 Cu0.5, 89.5% metal, -325+500 mesh)

Viscosity (typical): 1700 poise

Malcom viscometer @ 10rpm and 25°C

Initial Tackiness (typical): 40 grams

Tested to J-STD-005, IPC-TM-650, Method 2.4.44

Slump Test: Pass

Tested to J-STD-005, IPC-TM-650, Method 2.4.35

Solder Ball Test: Preferred

Tested to J-STD-005, IPC-TM-650, Method 2.4.43

Wetting Test: Pass

Tested to J-STD-005, IPC-TM-650, Method 2.4.45

Reliability Properties

Copper Mirror Corrosion: High

Tested to J-STD-004, IPC-TM-650, Method 2.3.32

Corrosion Test: Low

Tested to J-STD-004, IPC-TM-650, Method 2.6.15

SIR, IPC (typical): Pass

Tested to J-STD-004, IPC-TM-650, Method 2.6.3.3

Blank EM828

Day 1

1.5 ×109Ω 9.0 × 108Ω

Day 4

1.3 ×109Ω 9.8 × 108Ω

Day 7

9.5 ×108Ω 1.2 × 109Ω

Documentation Provided By HMC Electronics

33 Springdale Ave. Canton, MA 02021

http://www.hmcelectronics.com

[phone]

Application Notes

Availability:

Kester EM828 is available in the Sn96.5Ag3.0Cu0.5 alloy with Type 3 and Type 4 powder. Type 3 powder
mesh is recommended, but Type 4 powder is available for finer pitch applications. For specific packaging
information see Kester's Solder Paste Packaging Chart for available sizes. The appropriate combination
depends on process variables and the specific application.

Printing Parameters:

Squeegee Blade 80 to 90 durometer polyurethane or stainless steel
Squeegee Speed Capable to a maximum speed of 150 mm/sec (6 in/sec)
Stencil Material Stainless Steel, Molybdenum, Nickel Plated, Brass
Temperature/Humidity Optimal ranges are 21-25°C (70-77°F) and 35-65% RH

Recommended Reflow Profile:

The recommended reflow profile for EM828 made
with SAC alloys is shown here. This profile is
simply a guideline. Since EM828 is a highly
active solderpaste, it can solder effectively over a
wide range of profiles. Your optimal profile may be
different from the one shown based on you oven,
board and mix of defects. Please contact Kester if
you need additional profiling advice.

Cleaning:

EM828 residues are best removed using automated cleaning equipment (in-line or batch) within 48 hours of
soldering. De-ionized water is recommended for the final rinse. Water temperatures should be 49-60°C
(120-140°F). Kester's 5768 Bio-Kleen

®

saponifier can also be used in a 1-2% ratio for aqueous cleaning

systems.

Storage, Handling, and Shelf Life:

Refrigeration is the recommended optimum storage condition for solder paste to maintain consistent viscosity,
reflow characteristics, and overall performance. EM828 should be stabilized at room temperature prior to
printing. EM828 should be kept at standard refrigeration temperatures, 0-10°C (32-50°F). Please contact
Kester if you require additional advice with regard to storage and handling of this material. Shelf life is 6
months from date of manufacture and held at 0-10°C (32-50°F).

Health & Safety:

This product, during handling or use, may be hazardous to health or the environment. Read the Material
Safety Data Sheet and warning label before using this product.

World Headquarters: 800 West Thorndale Avenue, Itasca, Illinois, 60143 USA

Phone: [phone] • Email: [e-mail] • Website: www.kester.com

Kester Reflow Profile

SnAgCu Alloys

0

50

100

150

200

250

300

0 30 60 90 120 150 180 210 240 270 300

Time (sec.)

Temperature (C)

Pre-heating Zone

(2.0-4.0 min. max.)

Soaking Zone

(2.0 min.max.)

60-90 sec. typical

Reflow Zone

time above 217 C

(90 sec max)

60-75 sec. typical

Peak Temp.

235 - 255 C

<2.5 C/Sec

Asia Pacific Headquarters

500 Chai Chee Lane

Singapore 469024

([phone]

[e-mail]

European Headquarters

Zum Plom 5

08541 Neuensalz

Germany

([phone]

[e-mail]

Japanese Headquarters

20-11 Yokokawa 2-Chome

Sumida-Ku

Tokyo 130-0003 Japan

([phone]

[e-mail]

The data recommendations presented are based on tests, which we consider reliable. Because Kester has no control over the conditions of use, we disclaim any responsibility connected with the
use of any of our products or the information presented. We advise that all chemical products be used only by or under the direction of technically qualified personnel who are aware of the
potential hazards involved and the necessity for reasonable care in their handling. The technical information contained herein is consistent with the properties of this material but should not be used
in the preparation of specifications as it is intended for reference only. For assistance in preparing specifications, please contact your local Kester office for details.

EM828

Rev: 21Sep09

Documentation Provided By HMC Electronics

33 Springdale Ave. Canton, MA 02021

http://www.hmcelectronics.com

[phone]