Florida Finishing Polystyrene Barrier Coat Specification
P65-WH43 Polystyrene Barrier Coat is a low gloss acrylic lacquer intended as a primer or a barrier coat on polystyrene and other structural foam plastics including gas counter pressure types. It is fast drying, promotes adhesion, and prevents solvent attack from the topcoat.
White ... P65WH43
General: Substrate should be free of grease, oil, dirt, fingerprints, drawing compounds, any contamination, and surface treatments to ensure optimum adhesion and coating performance properties.
Plastic: Mold release must be removed from the substrate. Wash the surface with isopropyl alcohol. Due to the diverse nature of plastic substrates, a coating or coating system must be tested for acceptable adhesion to the substrate prior to use in production. Reground and recycled plastics along with various fire retardants, flowing agents, mold release agents, and foaming/blowing agents will affect coating adhesion. Please consult your Florida Finishing Representative for system recommendations.
Testing: Due to the wide variety of substrates, surface preparation methods, and application methods and environments, the customer should test the complete system for adhesion, compatibility and performance prior to full scale application.
• Fast drying
• Excellent adhesion to polystyrene
• Excellent adhesion to gas counter pressure Noryl® plastics*
• Prevents crazing or attacking of the plastic substrate by solvents in the topcoat
• No critical rec oat
• Ready to spray, no reduction needed
• May be used as a primer for wood, metal and other structural foam plastics.
• Compatible with a wide range of topcoats,including:
Polane® Polyurethane Enamels
CAB Acrylic Lacquers
Kem Aqua® 600T
Polane® 700T W/R Enamel
• Free of lead hazards as packaged in compliance with Consumer Product Safety Commission's (CPSC) 16 CFR Chapter II: Subchapter B, part 1303
The gloss meter provides a quantifiable way of measuring gloss intensity ensuring consistency of measurement by defining the precise illumination and viewing conditions. The configuration of both illumination source and observation reception angles allows measurement over a small range of the overall reflection angle. The measurement results of a gloss meter are related to the amount of reflected light from a black glass standard with a defined refractive index. The ratio of reflected to incident light for the specimen, compared to the ratio for the gloss standard, is recorded as gloss units (GU).
Measurement angle refers to the angle between the incident and reflected light. Three measurement angles (20°, 60°, and 85°) are specified to cover the majority of industrial coatings applications. The angle is selected based on the anticipated gloss range, as shown in the following table.
Low Gloss 5-10 Units
Low Gloss: 5-10 Units
Note: Viscosity measurements include Base and Reducer ONLY.
Zahn and Ford viscosity cups measure the rate of flow of a liquid.
The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal notion of "thickness". For example, honey has a higher viscosity than water.
Viscosity is due to friction between neighboring parcels of the fluid that are moving at different velocities. When fluid is forced through a tube, the fluid generally moves faster near the axis and very slowly near the walls, therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between layers and keep the fluid moving. For the same velocity pattern, the stress required is proportional to the fluid's viscosity. A liquid's viscosity depends on the size and shape of its particles and the attractions between the particles.
A liquid whose viscosity is less than that of water is sometimes known as a mobile liquid, while a substance with a viscosity substantially greater than water is called a viscous liquid.
In paint industries, viscosity is commonly measured with a Zahn or Ford cup, in which the efflux time is determined and given to customers. The efflux time can also be converted to kinematic viscosities (centistoke, cSt) through the conversion equations.
Theoretical Coverage: (no application loss)
Also known as the "Spreading Rate". Theoretical Coverage uses the total contents of an AD-MIXED coating. (Part A, plus Part B, plus Part C) Including all catalyst and reducer necessary to meet the Manufacturer Mixing Recommendations as specified on the Product Data Sheet.
277-396 Sq Ft/gal @ 1.0-1.2 MILS DFT
Per AD-MIXED KIT. Base and Catalyzed and Reducer.
Recommended Dry Film Thickness: (DFT)
Note: Coating is Sandable, Slow Build.
Coating material when dry (after curing) should typically have a thickness of 30–130 µm (0.0012–0.0051 in) when using acrylic resin, epoxy resin, or urethane resin. For silicone resin, the coating thickness recommended by the IPC standards is 50–210 µm (0.0020–0.0083 in).
There are several methods for measurement of conformal coating thickness and they fall into two categories. These categories are wet film and dry film conformal coating measurements
An alternative method to wet film measurement is using a non contact technique using eddy currents. The system works by placing the test head on the surface of the conformal coating, the measurement is almost instantaneous and provides an immediate repeatable result for thickness measurement of conformal coating.
Test coupons are the ideal method for measuring the coating thickness, whether is it spraying or dipping, and can be kept as a physical record of the performance. Apply the coating to the test coupons at the same time as the circuit boards provides a permanent measurement and an accurate guide to the coating thickness.
Mils Dry 1.0 - 1.2
Note: Curing temperature must not exceed the heat distortion temperature of the substrate.
Drying Time measurements are based on a 1.0 MIL DFT coating with an ambient temperature of 77°F, and a Relative Humidity of 50%. Note: Top Coat MUST be applied with-in 24 hours of Primer application.
Air Quality Data: (Theoretical)
Non-photochemically reactive Volatile Organic Compounds (VOC) as packaged, maximum 5.31 lb./gal, 637 g/L
Touch, Handle, Top-Coat, Pack, Force.
To Touch: 10 Minutes
To Handle: 20 Minutes
To Top Coat: 20 Minutes
To Pack: 3 Hours
To Force Dry: 5-10 Minutes at 140°F
Non-Catalized Coating. May be used from Storage Container.
If required, reduce with Lacquer Thinner R7K120.
Single Part Coating. No POT LIFE Specified. Do not leave coating exposed to air, as solvent loss will occur.
Single Part Coating.
The total period of time beginning with the date of manufacture, or date of pack, and terminated by the date by which an item must be used (expiration date) or subjected to inspection, test, or disposal action.
Shelf-life is not to be confused with service-life (defined as, A general term used to quantify the average or standard life expectancy of an item while in use.)
From MFG. Date. Based on Unopened container.
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