Monthly Archives: December 2014

Fast Turn-Around with Polyaspartic

Polyaspartic Floor Coverings

Polyaspartics are one of the better floor coating systems available today, because they are tough, relatively easy to apply and don’t yellow. It is a two-part formulation with excellent wetting and self-leveling properties, good adhesion and resistance to UV radiation. The product emits a low level of volatile organic compounds, is odor-free and dries to a smooth, high gloss.

Part A

Part A of the product is our old friend, hexamethylene diisocyanate (HDI), which we’ve discussed in previous blogs. Recall that its chemical formula is C8H12N2O2. It is a straight-chained, or aliphatic, example of a diisocyanate. Part A is the co-reactant in Sanitile 985 PA, containing 70 percent by weight of the homopolymer of HDI.

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Nanotech improves coating technology.


Coating science for concrete flooring has entered a brave new world thanks to nanotechnology, the use of particles in the 1- to 100–nanometer range — that’s as small as 10-9 of a meter. Particles this small behave according to the rules of quantum mechanics, creating completely new realms of applications. One exciting use of this technology is nanocoatings that can be applied to a variety of surfaces. We at PennCoat are, of course, most interested in concrete nanocoating products that provide superior protection against water damage, dirt, microbes and graffiti.

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Flexural Strength for Industrial Coatings

Flexural Strength

The next physical characteristic to fall under our gaze is flexural strength, which is simply resistance to bending along the sample’s axial plane — it is different from torsional, or twisting, strength. The standard flexural strength test for plastic materials, including coatings, paints and films, is ASTM D790. This test comes in three-point and four-point varieties, and simply applies pressure to the central region of a bendable sample. Flexural strength is of secondary importance for materials applied to surfaces that don’t bend, i.e. concrete floors. It is more pertinent to coatings applied to flexible substrates, like unsecured strips of thin metal or plastic, and as a general indication of the material’s quality.

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Concrete Moisture Tests : PennCoat, Inc.

Testing Concrete Moisture

Putting down a floor coating, or for that matter, flooring, on a moist concrete slab is not going to have a happy ending. Concrete cures, which means it takes time to develop full strength and give up its moisture. Floor coating will not adhere properly to moist concrete and will be prone to premature failure. Flooring laid on top of moist concrete can create bumps and gaps. In addition, the trapped moisture encourages nasty creatures — mold, mildew and bacteria. It is much cheaper to practice patience and allow a concrete floor to finish curing.

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Preserving Industrial Equipment with Acryllic Urethane

PennCoat Equipment Painting

Acrylic Urethane

We at PennCoat frequently use an acrylic urethane mastic called Durethane DTM, manufactured by PPG. It can be used to put a hard protective coat on metals, concrete and masonry. The product can produce a high gloss and can be tinted in various hues, with good color retention.  It has low amount of volatile organic compounds (VOCs), resists the sun’s ultraviolet rays and is fairly easy to apply. Durethane DTM is a two-component system consisting of a resin and a solvent that is mixed just before use to yield an acrylic urethane that builds a thick, high-solid surface without requiring a lot of substrate preparation. The shelf life of the unmixed components is three years from date of manufacture.

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