Dymax Light-Curable Conformal Coatings Selector Guide

20 Pages·2017·2.34 MB·English

by  Dymax Marketing Team

Light-Curable Conformal Coatngs
Selector Guide
OUR TECHNOLOGY.
®
YOUR ADVANTAGE.
At Dymax, we combine our product ofering with our expert
knowledge of light-cure technology. Where others only supply
products, we are commited to developing a true collaboratve
partnership, bringing our unsurpassed expertse in light-cure
technology and total process knowledge to our customers’ specifc
applicaton challenges.
Because we understand the process as a whole, we can ofer
our customers a soluton where chemistry and equipment work
seamlessly together with maximum efciency. Our applicaton
engineering team works side-by-side with our customers, providing
assistance with product and process design, equipment selecton and
integraton, testng, evaluaton, and pre-producton trials throughout
the life of the assembly process. Our laboratory is fully equipped to
deliver mechanical or electrical testng, as well as specialty testng
such as fowers of sulfur, salt spray, or thermal shock to ASTM
standards. The lab also has a variety of curing equipment and manual
Light-Curable Materials. and automated dispensing systems for evaluaton.
Dispensing Systems. Our assembly solutons and expertse give manufacturers the
knowledge and tools to increase productvity, lower costs, increase
Light-Curing Equipment. safety, and achieve a more efcient manufacturing process. That’s a
compettve advantage they can’t get anywhere else.
Technical Expertse.
1 | Light-Curable Conformal Coatngs Selector Guide
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Dymax light-curable conformal coatngs have been used to protect Superior Protecton
printed circuit boards (PCBs) for over thirty years in many high-reliability
applicatons, including military, aerospace, consumer electronics, medical, • IPC-CC-830, Mil-I-46058C, and UL listed
automotve, appliance, and telecom applicatons. Our conformal coatngs • Excellent environmental resistance
improve the circuit reliability of PCBs in harsh environments, protectng the • Excellent electrical propertes
boards from humidity, dust, fungus, and other contaminants that can cause • Tenacious adhesion to fex circuits (FPCs)
either current leakage or corrosion. • Low stress under thermal cycling
• Non-slumping viscosites
Our conformal coatngs are designed to help streamline the assembly
• Excellent abrasion resistance
process, curing tack free in seconds upon exposure to UV/Visible light
• Black coatngs help hide proprietary circuitry
to help streamline manufacturing assembly processes. Manufacturers
• Excellent chemical resistance
can apply, cure, and ship immediately, eliminatng tme-consuming steps
associated with traditonal thermal-cure and room temperature-cure
conformal coatngs. Each conformal coatng is one part (no mixing required) Superior Processing
for easy dispensing and is electrically insulatng so it can be applied over
• Easier automaton
the entre PCB surface or in select areas to provide protecton from service
• Full cure in seconds
environments.
• No racking or long ovens
Our solvent-free conformal coatngs contain very low VOCs, eliminatng the • No risk of silicone migraton
need for solvent handling, while enhancing worker safety and minimizing • Solvent free
environmental impact. • Thick coatngs in a single applicaton
• Repairable
• One part - no mixing or viscosity problems
Light-Curable Conformal Coatngs Selector Guide | 2
Selectng a Conformal Coatng
When selectng a light-curable conformal coatng, consider these questons when making your selecton:
How is the coatng being applied and cured? What cured propertes/specifcatons are required?
Typically, the best way to apply Dymax conformal coatngs is Dymax conformal coatngs are excellent insulators. In practce,
by selectve spray applicaton. This method ensures that areas propertes afectng the degree of protecton include coatng
which must be protected are coated at the desired thickness and thickness (thicker is typically beter), moisture absorpton (less is
areas which should not be coated remain uncoated. In additon, beter), and resistance to other environmental stresses. Flexible
selectve spray applicaton can be used to avoid depositng the grades are designed to enhance thermal cycling performance.
conformal coatng underneath components where the material Hard, more rigid grades are preferred to enhance chemical
is shadowed from light. resistance in harsh environments. Required specifcatons are
also important consideratons. Dymax conformal coatngs are
Dymax conformal coatngs cure in seconds under high-intensity used in a multtude of military and automotve applicatons.
UVA and blue visible light. With proper coatng applicaton, UV Dymax carries an array of MIL-I-46058C listed, IPC-CC-830-B
cure is a very simple processing step. approved and UL recognized coatngs.
How well does the coatng adhere to the PCB and Do you have any special requirements?
component materials?
Other than the coatng’s cured propertes, you’ll want to note
To provide efectve protecton to PCB components and any special requirements your process may need. Dymax ofers
surfaces, conformal coatngs must wet well upon applicaton and many conformal coatngs formulated with unique features that
adhere well afer cure. Optmal results are obtained with clean improve the quality inspecton process or that add extra security
boards. Adhesion testng is performed on materials commonly to PC boards. Conformal coatngs are also available with a
used in the industries for each of our conformal coatngs. This secondary cure opton such as heat or moisture for applicatons
informaton is reported on our product data sheets. that may have shadowed areas that are difcult to reach with
light.
ASSISTANCE WITH SELECTION AND TESTING
Selectng the correct coatng and equipment for your applicaton is
important to the overall success of your process. Our technical experts are
available to assist with product and process design, equipment selecton
and integraton, testng, evaluaton, and pre-producton trials throughout
the life of the assembly process. Our laboratory is fully equipped to
perform testng under a variety of environmental conditons including:

• Salt Spray • Shear strength
• Flowers of Sulfur • Thermal shock
• Humidity aging per ASTM standards • And more
Please contact our applicaton engineering department for more
informaton.
3 | Light-Curable Conformal Coatngs Selector Guide
Specialty Coatngs & Technologies
SHADOW CURE - SECONDARY HEAT & ULTRA-RED® FLUORESCING TECHNOLOGY
MOISTURE CURE FOR HARD TO REACH FOR EASIER COVERAGE INSPECTION
AREAS
Dymax Mult-Cure® coatngs are formulated to ensure complete Ultra-Red® fuorescing technology enhances bond-line
inspecton processes and product authentcaton. Adhesives
cure in applicatons where shadowed areas on high-density
formulated with Ultra-Red® remain clear untl exposed to low-
circuit boards are a concern. They are designed with either
intensity UV light at which point they fuoresce bright red. This
secondary moisture or thermal cure mechanisms. Our moisture
is partcularly efectve while bonding plastcs that naturally
cure formulas ensure shadowed areas cure over tme with
fuoresce blue, such as PVC and PET. Ultra-Red® technology
moisture, eliminatng the need for a second process step and
also produces a unique spectral signature that can be used by
concerns of component life degradaton due to temperature
manufacturers for product authentcaton.
exposure.
Mult-Cure® Coatngs Ultra-Red® Technology
MULTI-CURE® 9451: BLACK CONFORMAL MULTI-CURE® 9452-FC: LOW VISCOSITY,
COATING FOR PROTECTING SENSITIVE 100% SOLIDS, LED-CURABLE CONFORMAL
INFORMATION COATING
Dymax 9451 black conformal coatng was developed Mult-Cure® 9452-FC conformal coatng is 100% solids and has
specifcally to protect sensitve informaton on the PCB. Like a a viscosity of only 20 cP, making it the ideal choice for flm/
typical conformal coatng, it improves circuit reliability in harsh fow coatng or similar dispensing methods. It cures with UV/
conditons, but thanks to its mate black color, it has the added visible light but also has the ability to be cured with heat for
beneft of being able to conceal markings, labels, sensitve applicatons where shadowed areas exist. The coatng is LED
informaton, and other identfcaton on the circuit board. This optmized, curing in just seconds for immediate processing.
coatng has excellent coverage and can be applied and cured up 9482-FC also fuoresces blue under black light, allowing easier
to 5 mils thick in one pass. It can also be dispensed in multple in-line inspecton of coatng coverage.
passes if a thicker coatng is required.
Black Conformal Coatng Low Viscosity Conformal Coatng
Light-Curable Conformal Coatngs Selector Guide | 4
Available Conformal Coatngs
Product
Number Descripton Approvals
MIL-I-46058C
9-20557 n n Isocyanate free; medium viscosity for wetng components; 2,300 D60 37.9 15.8 150 >1,500 IPC-CC-830-B
low modulus for enhanced thermal cycling performance [5,500] [2,300] UL Flammability
UL 746
9-20557-LV n n Isocyanate free; low viscosity for thin coatngs; low 850 D70 310 21.7 100 >1,500 MIL-I-46058C
modulus for enhanced thermal cycling performance [45,000] [3,150] IPC-CC-830-B
Thixotropic, high-viscosity coatng; bonds well to FPCs;
9-20558- 2.3 6.2
n n fexible; can be used as a conformal coatng as well as an 20,000 D50 160 1,100 UL Flammability
REV-A [340] [900]
encapsulant
Isocyanate free; low viscosity for thin coatngs; rigid for MIL-I-46058C
984-LVUF n n n high chemical and abrasion resistance; optmized for LED 160 D85 724 55.8 4 1,800 IPC-CC-830-B
[105,100] [8,100] UL 746C
curing UL 94V-0 Flammability
Black color is excellent for hiding components and board
717 42.7
9451 n n features; designed for thin coatngs; optmized for single 6,000 - 4.4 1,200 UL 94V-0 Flammability
[104,000] [6,200]
pass coatngs up to 0.005”
Extremely low viscosity for flm/fow coatng applicatons;
1,137 34
9452-FC n n n very good thermal shock resistance; blue fuorescing; 100% 20 D60 6 1,000 UL 94V-0 Flammability
[165,000] [4,950]
solids; optmized for LED curing
Low viscosity for thin coatngs; low surface energy for MIL-I-46058C
9481-E n n difcult-to-wet components and assembly materials; high 125 D75 150 11 60 >1,500 IPC-CC-830-B
chemical and abrasion resistance; excellent resistance to [21,800] [1,600] UL 94V-0 Flammability
corrosion from sulfur UL 746E
Thermal shock and chemical resistance; superior re- MIL-I-46058C
9482 n n workability; blue fuorescing; Excellent resistance to 1,100 D70 275 15.8 26 1,100 IPC-CC-830-B approved
[40,000] [2,300] UL 94V-0 Flammability
corrosion from sulfur UL 746E
Excellent thermal shock resistance; corrosion resistant;
276 16.2
9483 n n great temperature/humidity performance; blue fuorescing; 690 A55 22 1,500
[40,000] [2,350]
recommended for automotve applicatons
5 | Light-Curable Conformal Coatngs Selector Guide
UV/ Visible Light
LED
Heat
Moisture
Viscosity cP
Durometer
Hardness
Modulus of Elastcity,
MPa (psi)
Tensile at Break,
MPa [psi]
Elongaton at Break,
%
Dielectric Withstand
Voltage, V/mil
Industries Served
AUTOMOTIVE
Typical applicatons include speedometer
circuitry, engine control modules and sensors,
door and window controls, airbag sensors,
audio circuitry, and more. Learn more in our
Product
guide, “Light-Curable Materials for Automotve
Number Descripton Approvals
Electronics”.
MIL-I-46058C
9-20557 n n Isocyanate free; medium viscosity for wetng components; 2,300 D60 37.9 15.8 150 >1,500 IPC-CC-830-B
low modulus for enhanced thermal cycling performance [5,500] [2,300] UL Flammability
UL 746 INSTRUMENTATION
9-20557-LV n n Isocyanate free; low viscosity for thin coatngs; low 850 D70 310 21.7 100 >1,500 MIL-I-46058C Typical applicatons include sensor circuits,
modulus for enhanced thermal cycling performance [45,000] [3,150] IPC-CC-830-B display connectors, mother boards, and more.
Thixotropic, high-viscosity coatng; bonds well to FPCs;
9-20558- 2.3 6.2
n n fexible; can be used as a conformal coatng as well as an 20,000 D50 160 1,100 UL Flammability
REV-A [340] [900]
encapsulant
Isocyanate free; low viscosity for thin coatngs; rigid for MIL-I-46058C
984-LVUF n n n high chemical and abrasion resistance; optmized for LED 160 D85 724 55.8 4 1,800 IPC-CC-830-B SMART CONNECTED DEVICES
[105,100] [8,100] UL 746C
curing UL 94V-0 Flammability Typical applicatons include PCBs for camera
modules, tablets, cell phones, computers,
Black color is excellent for hiding components and board
9451 n n features; designed for thin coatngs; optmized for single 6,000 - 717 42.7 4.4 1,200 UL 94V-0 Flammability wearables, and more. Learn more in our guide,
[104,000] [6,200]
pass coatngs up to 0.005” “Light-Curable Materials for Smart-Connect
Device Assembly”.
Extremely low viscosity for flm/fow coatng applicatons;
1,137 34
9452-FC n n n very good thermal shock resistance; blue fuorescing; 100% 20 D60 6 1,000 UL 94V-0 Flammability
[165,000] [4,950]
solids; optmized for LED curing
APPLIANCE
Low viscosity for thin coatngs; low surface energy for MIL-I-46058C
Typical applicatons include control boards,
9481-E n n
cdhifemcuiclta-lt oa-nwde atb croasmiopno nreesniststa anncde ;a esxsecemllbelnyt m reastiesrtiaanlsc;e h tigoh 125 D75 [21,580 0 ] [1,16100] 60 >1,500 IUPLC 9-C4CV-803 F0la-Bm mability sensors, and modules used in handheld
corrosion from sulfur UL 746E power tools, appliance sub-components,
small consumer appliances, and major home
Thermal shock and chemical resistance; superior re- MIL-I-46058C appliances. Learn more in the “Dymax Appliance
9482 n n workability; blue fuorescing; Excellent resistance to 1,100 D70 275 15.8 26 1,100 IPC-CC-830-B approved Applicaton Guide”.
[40,000] [2,300] UL 94V-0 Flammability
corrosion from sulfur UL 746E
Excelent thermal shock resistance; corrosion resistant; INDUSTRIAL
276 16.2
9483 n n great temperature/humidity performance; blue fuorescing; 690 A55 22 1,500
recommended for automotve applicatons [40,000] [2,350] Typical applicatons include circuit boards
used in electrical sockets, power supplies, and
switches.
Light-Curable Conformal Coatngs Selector Guide | 6
UV/ Visible Light
LED
Heat
Moisture
Viscosity cP
Durometer
Hardness
Modulus of Elastcity,
MPa (psi)
Tensile at Break,
MPa [psi]
Elongaton at Break,
%
Dielectric Withstand
Voltage, V/mil
Coatng Performance Studies
Testng 9-20557 984-LVUF 9451 9452-FC 9481-E 9482 9483
CORROSION RESISTANCE - FLOWERS OF SULFUR
(ASTM B809)
Poor Good ─ Excellent Excellent Excellent Excellent
50oC, 90% RH, 96 hours exposure to sublimed sulfur. Test
boards were then inspected for tarnish and corrosion on the
copper fnish of the test board.
Before - Uncoated PCB Afer - Uncoated Afer - Coated w/Dymax
CORROSION RESISTANCE - SALT FOG
(ASTM B117)
35oC, 5% salt soluton for 96 hours. Test boards were then Good Good Excellent Excellent Excellent Excellent Excellent
inspected for corrosion on the copper fnish of the test
board. No disruptve charge by fash over, spark over, or
break-down in dielectric voltage transient test. Before - Uncoated PCB Afer - Uncoated Afer - Coated w/Dymax
HIGH TEMP./HIGH HUMIDITY
85oC/85% Humidity for 500 hours. Inspect for sofening,
Pass Pass* TBD Pass Pass Pass Pass
chalking, blistering, cracking, tackiness, loss of adhesion,
reversion or liquefacton. No disruptve charge by fash over,
spark over or break-down in dielectric voltage transient test. Before - Uncoated PCB Afer - Uncoated Afer - Coated w/Dymax
THERMAL SHOCK RESISTANCE***
-55oC to 125°C, 30 minute dwell tme, 300 cycles. Sn-Pb
Pass Pass TBD Pass Pass Pass Pass
components assembled PCB003 test boards with AgIm
fnish. Test boards were then inspected for any cracking or
delaminaton.
Afer - PC003 Test Boards Afer - Flat Boards
FLEXIBILITY (IPC-TM-650 2.4.5.1)
Pass Pass Pass Pass Pass Pass Pass
180° bend test was performed. The test boards were then
inspected for cracking or delaminaton.
FLAMMABILITY
UL V-0
UL V-1 UL V-0 UL V-0 UL V-0** UL V-0 UL V-0
Pending
UL94 Vertcal burn test
* Tested to IPC-TM-650 2.6.11.1 ** Meets UL V-0. Testing completed internally at Dymax
*** 9452-FC tested on fat boards. 9482 and 9-20557 tested on PCB003 test boards. 9481-E & 984-LVUF tested to IPC-TM-650 2.6.7.1 testing.
7 | Light-Curable Conformal Coatngs Selector Guide
Testng 9-20557 984-LVUF 9451 9452-FC 9481-E 9482 9483
CORROSION RESISTANCE - FLOWERS OF SULFUR
(ASTM B809)
Flowers of Sulfur Testng Chamber
Poor Good ─ Excellent Excellent Excellent Excellent
50oC, 90% RH, 96 hours exposure to sublimed sulfur. Test
boards were then inspected for tarnish and corrosion on the
copper fnish of the test board.
CORROSION RESISTANCE - SALT FOG
(ASTM B117)
o
35 C, 5% salt soluton for 96 hours. Test boards were then Good Good Excellent Excellent Excellent Excellent Excellent
inspected for corrosion on the copper fnish of the test
board. No disruptve charge by fash over, spark over, or
break-down in dielectric voltage transient test.
Salt Fog Chamber
HIGH TEMP./HIGH HUMIDITY
85oC/85% Humidity for 500 hours. Inspect for sofening,
Pass Pass* TBD Pass Pass Pass Pass
chalking, blistering, cracking, tackiness, loss of adhesion,
reversion or liquefacton. No disruptve charge by fash over,
spark over or break-down in dielectric voltage transient test.
THERMAL SHOCK RESISTANCE***
-55oC to 125°C, 30 minute dwell tme, 300 cycles. Sn-Pb
Pass Pass TBD Pass Pass Pass Pass Flammability Test
components assembled PCB003 test boards with AgIm
fnish. Test boards were then inspected for any cracking or
delaminaton.
FLEXIBILITY (IPC-TM-650 2.4.5.1)
Pass Pass Pass Pass Pass Pass Pass
180° bend test was performed. The test boards were then
inspected for cracking or delaminaton.
FLAMMABILITY
UL V-0
UL V-1 UL V-0 UL V-0 UL V-0** UL V-0 UL V-0
Flexibility Testng
Pending
UL94 Vertcal burn test
* Tested to IPC-TM-650 2.6.11.1 ** Meets UL V-0. Testing completed internally at Dymax
*** 9452-FC tested on fat boards. 9482 and 9-20557 tested on PCB003 test boards. 9481-E & 984-LVUF tested to IPC-TM-650 2.6.7.1 testing.
Light-Curable Conformal Coatngs Selector Guide | 8
CHEMICAL RESISTANCE - AUTOMOTIVE FLUIDS
A selecton of Dymax conformal coatngs were tested for their chemical resistance against a variety of fuids commonly found in the automotve
industry. The conformal coatngs were dispensed and then cured for 20 seconds using a Dymax 5000-EC food lamp at an intensity of
2
200 mW/cm . The samples were then immersed in the fuids for 72 hours, afer which they were removed and wiped clean. The samples
were then lef at room temperature for 1 week. The inital weights of the sample coatngs were recorded, as well as the weights afer the
72 hour soak and afer the 1 week.
9-20557 984-LVUF 9451 9452-FC 9481-E 9482
Change from Inital Weight Change from Inital Weight Change from Inital Weight Change from Inital Weight Change from Inital Weight Change from Inital Weight
Inital Weight Inital Weight Inital Weight Inital Weight Inital Weight Inital Weight
(grams) (grams) (grams) (grams) (grams) (grams)
72 H 1 Week 72 H 1 Week 72 H 1 Week 72 H 1 Week 72 H 1 Week 72 H 1 Week
Motor Oil 0.71 0.24% 0.06% 0.70 0.04% -0.02% 0.06 0.32% 0.31% 0.69 0.27% 0.38% 0.71 0.05% 0.06% 0.72 0.02% 0.02%
Brake Fluid 0.70 64.59% 60.29% 0.70 13.40% 10.53% 0.06 57.86% 34.82% 0.68 20.64% 18.55% 0.72 1.00% 0.45% 0.71 5.15% 3.74%
Transmission Fluid 0.67 0.88% 0.49% 0.70 -0.07% -0.07% 0.06 0.69% 0.42% 0.67 0.31% 0.44% 0.70 -0.04% 0.01% 0.71 -0.05% 0.01%
Power Steering Fluid 0.68 0.13% -0.13% 0.70 0.09% -0.01% 0.06 0.45% -0.19% 0.68 0.22% 0.34% 0.70 0.13% 0.04% 0.72 -0.01% -0.07%
Water 5% NaCl 0.69 3.02% -0.41% 0.70 0.57% 0.00% 0.06 2.57% 0.22% 0.67 4.49% 1.12% 0.70 0.66% 0.01% 0.72 0.73% -0.03%
IPA 99% 0.72 64.45% 2.49% 0.70 26.73% 10.88% 0.07 20.95% 2.17% 0.67 20.26% 5.38% 0.70 7.51% 5.08% 0.71 15.62% 5.35%
Diesel Fuel 0.69 9.02% 4.28% 0.69 0.08% 0.02% 0.06 -0.25 0.40% 2.06 0.20% 0.31% 0.71 0.07% -0.03% 0.72 0.49% 0.07%
9 | Light-Curable Conformal Coatngs Selector Guide