In this test, loss of gloss
and film degradation were evaluated after 200 cycles on the Gardner Abrasion Tester using a 1 lb boat resting on cheesecloth saturated with Fantastik[R].
The final part of the lecture centred on drier systems for silicone alkyd paints, reactive intermediates to make silicone alkyd copolymers water-dispersible, and accelerated weather tests for a range of different test conditions, with particular respect to loss of gloss
Examples include loss of gloss
, chalking, blistering, acid etch and water spotting, cracking, lifting, peeling, fading, and corrosion.
Examples of the former include loss of gloss
, blistering, water spotting, acid etch, most cracking and checking, delamination, fading and other color changes, and corrosion.
There are a number of different ASTM tests or practices for water resistance of coatings, all of which may produce other effects, such as loss of gloss
and loss of adhesion, in addition to blisters:
ASA polymers possess inherent UV resistance, that when colored with light-stable pigments ASAs achieve long-term outdoor color retention without the need to paint, whereas similar pre-colored polymers such as ABS, HIPS (high impact polystyrene), or PVC (polyvinyl chloride) are more susceptible to dramatic color shifts accompanied by degradation and loss of gloss
and other properties upon long-term UV exposures.
After eight years of service, a recent inspection revealed that the coating retains an excellent appearance with no fading or loss of gloss
The cause of coating degradation such as discoloration, delamination, loss of gloss
, cracking and chalking is due to the chromophores, or impurity content, found in the material triggered by UV light, which is damaging.
The injury was observed in terms of the change in the color, color shade, loss of gloss
and peeling out of the film, etc.
Loss of gloss
and thin corners due to poor extensibility of the melt also put limits on reducing melt temperature.
This high angle, indirect gloss measure will be most sensitive to the initial loss of gloss
in very glossy samples.
The tests typically consist of the application of a complex scratch pattern followed by measurement of the loss of gloss
of the damaged area (1, 2).