Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Benefits
- Superior toughness and abrasion resistance
- Reworkable and room temperature cure
- Solvent and discoloration resistant
- Fluorescent under UV light
- No cracking or crazing with vibration
- Easier to re-work than epoxy-based coatings
- Urethane Conformal Coatings
Superior Toughness, Abrasion Resistance, and Chemical Stability
Polyurethane coatings are available as either aerosol or bulk formulations. Both formulations provide excellent humidity resistance and far greater chemical resistance than Acrylic coatings. These Spray Conformal Coating are Single component Polyurethanes, while easy to apply, enjoy long pot life but sometimes require very lengthy cure cycles to achieve full or optimum cure. The cure cycle can be accelerated by the application of heat typically reducing cure times to less than 4-5 hours at 50% humidity.
Cleanliness of the substrate is of extreme importance for the successful application of a conformal coating. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures. MS-470C will cover 8.6 square feet at a 2-mil thickness per 14-oz. aerosol can. MS-472C, the bulk liquid version of the product, is available in quarts and gallons for dip, brush, or spray applications and will cover 120 square feet per gallon at a 2-mil thickness. Printed circuit boards or electronics covered with urethane coating are repairable. Simply heat the coating with a soldering iron to remove the components.
Urethane Conformal Coatings provide a barrier to air-borne contaminants from the operating environment, such as salt-spray, thus preventing corrosion. Some typical application examples include high-reliability defense, automotive and aerospace, where coatings are used to protect against various combinations of moisture, aggressive chemicals and vapors, salt sprays, large temperature variations, mechanical vibration, and even organic attack (e.g. fungus). The protective nature of conformal coatings also means that they not only protect, but also serve to enhance product reliability and thereby reduce the potential cost and damaging effects of early field failures.
Applications & Uses
- Applications
- Application Method
- Cure Method
- Applications
Application should be done in a well-ventilated area. Proper safety
equipment and chemical resistant gloves are strongly
recommended- Hold can 6 – 8 inches away from the assembly and apply a
medium-light coating. Coating must be applied wet and
allowed to dry on the surface of the assembly. - Allow coating to dry for 30-35 minutes at room temperature.
- Apply 1-2 additional medium wet coats with 30-35 minutes
between each. - A total cured film thickness of 2 ± 1mil is recommended.
- Once spraying is complete, immediately invert can and purge
the valve and actuator. This will prevent clogging and
premature valve failure. - Drying and curing of the coating depends upon evaporation of
the solvent and subsequent reaction of the polymer with
moisture in the air at elevated or room temperatures.
- Hold can 6 – 8 inches away from the assembly and apply a
- Applications
Allow 48 hours minimum to reach room temperature before using cans stored or received during cold weather.
Post Application: Air dry for 30 minutes. Repeat up to 2-3 coats. The recommended cure schedule is 2 hours at 140°F/60°C and a relative humidity of 30% to 50%. If the humidity level is less than 30%, place an open container of distilled water in the oven and allow to equilibrate. The alternate cure, at room temperature and a relative humidity of 30% to 50%, will be tack free in one to four hours, semi-hard in one day, and fully cured in seven days.
Properties
- Physical Form
- Appearance
- No blistering, wrinkling, cracking, or peeling of film, after thermal shock and moisture resistance testing.
- Electrical Properties
- Cured Properties
| Value | Units | Test Method / Conditions | |
| Volume Resistivity | 2.0 x 1013 | ohm-cm | — |
| Dielectric Strength | 1200 | volts/mil | — |
| Dielectric Constant(105 Hz at 25°C) | 4.2 | — | — |
| Dissipation Factor(105 Hz at 25°C ) | 0.01 | — | — |
| Value | Units | Test Method / Conditions | |
| Operating Temperature | -67/-55 to 230/110 | °F/°C | — |
| Flexibility | No cracking of film over a 1/8" diameter mandrel. | — | — |
| Fungus Resistance | Non-nutrient per ASTM G21 | — | — |
| Fluorescent | Under ultraviolet light. | — | — |
Technical Details & Test Data
- Aerosol Preparation and Room Conditions
- 1. Important do not shake can prior to usage. Allow can to warm
up to room temperature prior to use. Failure to do so will affect
sprayability and can affect coating performance. - MS-470C should be applied at room temperature.
- MS-470C should not be applied where relative humidity is
below 30% or above 70%. Ideal room conditions are the
following: 50-60% humidity and 70–80 °F. - If reusing a previous sprayed aerosol can, invert can to clean
valve and perform several test sprays to inspect spray pattern
and fluid delivery. If both appear suitable continue with the
application process.
- 1. Important do not shake can prior to usage. Allow can to warm
- Cure Schedules
Final film properties can be achieved by either heat acceleration or
room temperature.- Heat Accelerated: Allow board to air dry for 30-45 minutes
prior to placement into the oven. - Oven curing must be done at 60-68°C (140-154 °F) at a
humidity level of 40-55%. This can be achieved by placing a
pan of distilled water in the cure oven one hour before you
place the coated assemblies inside.
NOTE: Failure to provide humidity during the heat accelerated
curing program will affect final film performance. - Oven cure the coated assemblies for ~ 2hrs.
- Allow an additional 1 – 2 days at room temperature and 45-
55% humidity for final film properties to be developed once
removed from the oven. - Room Temperature / Air Cure: Allow to cure for 7 days at room
70-80 °F at a relative humidity of 55-65%. - Coatings will typically be tack-free in 1 – 4 hours depending
on the number coats, coating thickness, and room conditions.
- Heat Accelerated: Allow board to air dry for 30-45 minutes
- Clean-up
Uncured MS-470C can be removed with aromatic, ketones, or glycol ethers. Removal of cured MS-470C will require Miller- Stephenson MS-114D or MS-115 Conformal Coating Stripper.
Packaging & Availability
- Sizes Available
14 oz Aerosol
Storage & Handling
- Storage
Aerosol Cans should be kept at 70-77°F and away from direct contact with sunlight.
- Limitation Of Liability And Remedies
Manufacturer warrants that, at the time of sale by the Manufacturer, this product is free from defect in material and manufacture. If the product is proved to be defective, the exclusive remedy, at Manufacturer’s option, shall be refund of the purchase price or replacement of the defective product, provided written notice of the defect is given no later than 210 days
after sale by the Manufacturer. Manufacturer shall not otherwise be liable for loss or damages whether direct, indirect, incidental or consequential, regardless of the legal theory asserted, including negligence and strict liability. Manufacturer expressly disclaims all implied warranties, including the implied warranty of merchantability and the implied warranty of fitness for a particular purpose. There are no warranties which extend beyond the description on the face hereof