EF
by
ABchimie
ABchimie 526UV DS55 M/ ABchimie 526UV DS140 M
UV Dual Cure Conformal Coating
FEATURES
ABchimie 526UV M Conformal Coating is a transparent one-component coating for the protection of
electronic PCBAs formulated to meet the highest resistance requirements. The dual cure technology
(UV/moisture) allows cross-linking in shadowed areas.
ABchimie 526UV M is suitable for selective coating machine which is the ideal way to apply. The low
viscosity of our system permits to limit the thickness around 80 microns.
PERFORMANCE
&
RELIABILITY
COST
ENVIRONMENT
High accurate deposit
Very fast curing for short process
Excellent chemical and solvent resistance
No cracking
Excellent dielectric properties
Complies with IPC-830CC
UL94V0 and NF EN 61056 approved
High speed process for increase of productivity
Floor plan can be reduced compared to solvent base coatings
Non-flammable
Solvent Free
No VOCs
TYPICAL PROPERTIES
Properties Liquid
Nature
Colour
Non-volatile content %
Flash Point
Viscosity @ 25°C
ABchimie 526UV M Conformal Coating
Urethane/ Acrylate
Slightly yellow liquid
100
> 100° C
55 – 140 cSt
ABchimie526 UV DS55 M/ DS140 M
Properties Cured
ABchimie 526UV M Conformal Coating
Colour
Transparent
Adhesion per ISO 2409
Class 0 – Excellent
Electrical Resistivity
1 x 10 Ohms/ cm
Insulation Resistance per MIL-I-46058C
Temperature Range
Touch Dry Time (min)
Dielectric Strength
Electric breakdown voltage per MIL-I-46058C
Saline mist per NF EN 61086
(35°C, 5% salt, 2 ml/h)
Flammability
Rapid Temperature Variation test
(-25° to 25° C, 100 cycles, 15 min plateau, 5°C/min)
Thermal Shock
(15 min @ -25°C to 15 min @ 50°C/ 50 cycles)
SIR test
(15 Hr/ 20° to 80°C / 90% RH)
Moisture Resistance
(10° to 80° C/ 95% RH/ 90 days)
Removal of coating
14
12
1 x 10
ohms (NF EN 61086)
-55° to 150°C
NA
90 KV/ mm
> 1750 V (NF EN 61086)
Pass
Self extinguishing, UL94V0
Pass
Pass
Pass
Pass
Mechanical by abrasive blasting
CHARACTERISTICS
Excellent adhesion under all climatic conditions.
Fluorescent under UV light as an aid to inspection.
Wide temperature range from -55°C to 150°C.
Can be soldered through without fear of highly toxic gases being produced.
Resistant to mould growth.
Provides excellent Dielectric properties.
Very fast curing under UV light and offers moisture curing for shadowed areas.
Low viscosity for select coat machine. Used with SC200 head in Asymtek machinery.
ABchimie526 UV DS55 M/ DS140 M
Characteristics
ABchimie 526UV M Conformal Coating
Solder-through repairability
Yes
Solvent and chemical resistance
Yes
6 months, when stored in the original, unopened
container
Shelf life
Transparent after curing
Yes
Environmental
No VOC
Approvals
CEI NF EN 61086
Approvals
UL files QMJU2 – E308681
Application options
Dipping, spray, brushing, or selective coating
Recommended coating thickness
30 – 150 microns
APPLICATION
ABchimie 526UV M can be applied by brush, spray or selective coating machine:
Spraying (two crossed layers): 60-80 microns
Brushing: 40-60 microns
Selective coating machine: 70-80 microns (380mm/s)
Workshop temperatures of minimum 16°C and relative moisture of 50% minimum are suitable for the application
of ABchimie 526UV M conformal coating. Relative moisture of 50% minimum is suitable for the second cure
mechanism.
All PCBs, being composite materials, absorb moisture. If this is not removed, the conformal coating may not
protect to its fullest extent. Pre-drying of 4 hours at 80°C, or better still, vacuum desiccation, will remove most of
the moisture.
ABchimie 526UV M Conformal Coating contains a fluorescent tracer which allows inspection of the PCB after
coating to ensure complete and even coverage. The stronger the fluorescence, the thicker the coating layer is.
ABchimie 526UV DS55 M (55 cSt) is default set viscosity for standard coating process. ABchimie 526UV
DS140 M version (140 cSt) can be used for double side coating with heat fluid circulating system and if
environment at the dispensing machine is submitted at high temperature variations along the day
Cleaning
Boards should be thoroughly cleaned before coating. This is required to ensure that satisfactory adhesion of the
coating to the substrate is achieved. Solder paste flux residues must also be removed as they may become
corrosive when left on the PCBA.
In past years there have been major improvements in flux residues reliability and their compatibility with
conformal coating. This improvement in electrochemical corrosion has been achieved using the Bono test as
key technique to assure the chemical residue of the flux is chemically inert after soldering providing a reliable
adhesion. This is a key reliability advantage for no-clean processes using conformal coating. Inventec offer
TM
ECOREL solder pastes compliant with Bono test and all SIR industry standards.
To clean equipments of ABchimie 526UV M conformal coating not cured, it is recommended to use cleaning
solvent SND.
ABchimie526 UV DS55 M/ DS140 M
Spray application
Spray in cross lapped coats in order to cover correctly all the components and the confined spaces and to
ensure an optimal coating.
The used air must be dry to avoid the premature gelling of conformal coating.
Brushing application
Gently apply the coating with a good quality brush (silk).
Dry Times and Curing Conditions
ABchimie 526UV M conformal coating polymerises with UV technology and moisture for the second cure
mechanism.
UV Curing:
It is important to use the appropriate UV equipment, as well as the parameters recommended to obtain the
optimal properties of the ABchimie 526UV M conformal coating.
The following graph gives the optimal conditions to polymerize the ABchimie 526UV M conformal coating and
obtain the best performances:
Mercury arc lamp 120 W/cm
1 x 1m/min < cycle < 1 x 3m/min
0,7 J/cm² < UVA dose < 2,7 J/cm²
UVA Dose and UVA irradiance vs speed belt
=> Determination of optimal cured conditions
Characteristics of the UV equipment:
Mercury arc lamp 120 W / cm
3,000
0,400
0,350
2,500
0,300
2,000
UVA dose must be included between 0,7 J/cm² and 2,7 J/cm²
0,250
1,500
0,200
belt speed must be included between 1 m/min and 3m/min
(Can vary according to the height of the lamp, the reflector...)
0,150
1,000
0,100
0,500
0,050
0,000
0
UVA dose J/cm²
2
4
6
8
10
speed belt m/min
12
14
16
18
0,000
20
UVA irradiance W/cm²
ABchimie526 UV DS55 M/ DS140 M
Moisture cure:
Ambient temperature
50% minimum relative moisture
Curing mechanism:
moisture
UV
acrylate monomer
R
R2
R
R
R2
R2
R2
urethane prepolymer
R
R
R
R
R
R
acrylate prepolymer
liquid conformal coating
R
R2
R2
UV then moisture cure
R
R
R
R2
R
R
R2
R
R2
R
R
polymerized conformal coating
R
R2
PACKAGING
ABchimie 526UV M conformal coating
5 litre Bulk
5 litres Bulk
ABchimie 526UV DS55 M 05L
ABchimie 526UV DS140 M 05 L
STORAGE
ABchimie 526UV M conformal coating must be stored in opaque and hermetic container, away from
excessive heat, and at temperature below 40°C.
ABchimie 526UV M conformal coating cures under UV, so it is important not to expose it to light sources.
This conformal coating also cures with moisture, so be careful that there is no moisture in the select coat
machine, in the used tanks, in the begun bulks.
After opening of bulks, it is recommended to purge these bulks with a dry and inert gas (Nitrogen) to avoid the
polymerisation of the conformal coating during the storage.
ABchimie526 UV DS55 M/ DS140 M
HSE
Before using this product, please read the current product material safety data sheet (available through your
sales or technical service representative) and the precautionary statement on the product package. Follow all
applicable precautions and directions.
No issues when used as recommended.
INVENTEC Material Safety Data sheets can be found at www.quickfds.com
Please refer to Material Safety Data Sheet before use
This data is based on information that the manufacturer believe to be reliable and offered in good faith. In no event will
INVENTEC be responsible for special, incidental and consequential damages. The user is responsible to the Administrative
Authorities (regulations for the protection of the Environment) for the conformity of his installation.
BRY-FP-409-v2-16/07/14