Miller-Stephenson Chemical MS-472C Urethane Coating

Miller-Stephenson Chemical MS-472C Urethane Coating is a non-flammable, solvent-based, one-component polyurethane conformal coating that be applied by brush, spray or dip methods. Our coating provides excellent electrical and barrier properties in a thin-film applications on components and PCBs. When fully cured, the applied urethane coating exhibits superior toughness, abrasion resistance, and excellent moisture and chemical resistance. MS-472C will maintain its properties even after long exposure to the elements with minimal color change.

Product Type: 1K (1 component) Coating, Conformal Coating, Solventborne Coating

Features: Abrasion Resistant, Chemical Resistant, Good Toughness, Good Weather Fastness, Moisture Resistant, Solvent Resistant

Application Method: Brush, Dip Coating, Spray

Chemical Family: Polyurethanes (PU)

Technical Data Sheet

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Identification & Functionality

Chemical Family

Features & Benefits

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

Applications & Uses

Application Method
Cure Method
Applications

Application should be done in a well-ventilated area. Proper safety equipment and chemical resistant gloves are strongly recommended
1. Coats should be applied wet and allowed to dry on the surface.NOTE: When using spray equipment, application of a wet-film is critical to achieve the proper thin-film coatings that achieve the desire performance. Adjust your spray equipment and spray distance so an even uniform, wet coating is applied.

2. Allow coating to dry for 30-35 minutes at room temperature.
3. Apply 1-2 additional medium wet coats with 30-35 minutes between each.
4. A total cured film thickness of 2 ± 1mil is recommended.
5. Once spraying is complete, immediately purge and solvent flush your equipment. This will prevent clogging and premature equipment blockages.
6. 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.

Properties

Physical Form
Appearance
No blistering, wrinkling, cracking, or peeling of film, after thermal shock and moisture resistance testing.
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivity2.0 x 1013ohm-cm
Dielectric Strength1200volts/mil
Dielectric Constant(105 Hz at 25°C)4.2
Dissipation Factor(105 Hz at 25°C )0.01
Cured Properties
ValueUnitsTest Method / Conditions
Operating Temperature-67/-55 to 230/110°F/°C
FlexibilityNo cracking of film over a 1/8" diameter mandrel.
Fungus ResistanceNon-nutrient per ASTM G21
FluorescentUnder ultraviolet light.
VOC Content of MS-472C893g / l

Technical Details & Test Data

Equipment Preparation and Room Conditions:

1. All handling and application equipment coming into contact
with the MS-472C must be clean, oil-free and most importantly
moisture free. Allow the product to warm up to room
temperature prior to use. Failure to do so will affect
sprayability and can affect coating performance.
NOTE: MS-472C uses chlorinated solvents as part of its
carrier fluid package, usage of aluminum tools or spray
equipment is strongly not recommended and can lead to
equipment failure.
2. MS-472C should be applied at room temperature
3. MS-472C 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.
4. If using compressed air-based spray equipment, then proper
filtration of the source air supply should be in place. Failure to
have contaminate, oil and moisture free air can affect product
performance and final film properties.
5. MS-472C is a ready-to-use product, do not dilute or modify
the product prior to use.

Cure Schedules

Final film properties can be achieved by either heat acceleration or room temperature.
1. Heat Accelerated: Allow board to air dry for 30-45 minutes prior to placement into the oven.
2. 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.
3. Oven cure the coated assemblies for ~ 2hrs.
4. 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.

5. Room Temperature / Air Cure: Allow to cure for 7 days at 70-80 °F at a relative humidity of 55-65%.
6. Coatings will typically be tack-free in 1 – 4 hours depending on the number coats, coating thickness, and room conditions.

Clean-up

Uncured MS-472C can be removed with aromatic, ketones, or glycol ethers. Removal of cured MS-472C will require Miller-Stephenson MS-114D or MS-115 Conformal Coating Stripper.

Storage & Handling

Storage and Handling

Product should be kept at 70-77°F in a dry, controlled air environment and away from direct contact with sunlight. Failure to store the product as recommended above may lead to deterioration in product performance. This product is sensitive to moisture and atmospheric humidity. Containers, once opened, should be used immediately or blanketed with dry air, nitrogen, or argon.

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.