How to judge the economics of coatings?

China Coatings Network
News:
1, can not use unit price to measure the economics of coatings.
For corrosion-resistant
coatings
, whether it is a liter or a kilogram , the unit price alone cannot determine its economy , because the effective content of different coatings is different , in the case of obtaining the same dry film thickness , the amount of paint consumed ( volume or weight ) is different . Low-priced coatings may consume more.
Although due to the problem of loss coefficient, so that in a certain dry film thickness per square meter of paint costs have theoretical costs and actual costs, but for the same construction conditions, different manufacturers of paint, the actual loss coefficient should be the same, and there is no paint loss coefficient, and another manufacturer's paint loss coefficient is small problem. Therefore, according to the theoretical coating cost per square meter can be used
the economics of
anti-corrosion coating. Of course, the calculation of such theoretical costs must be based on the accuracy of the coating parameters (mainly volume solids and gravitys).
Each paint manufacturer calculates the theoretical cost according to the volume solids and proportions of its own products, but if the volume solids and proportions are not true or accurate, the theoretical costs per square meter obtained are certainly not true. At present, many small
coating factory
even do not understand what is volume solids, also do not know how to calculate the theoretical cost, and some paint users not to mention, so it is difficult to compare the economy of different manufacturers of paint fairly.
of the anti-corrosion coating reflects how much dry film thickness can be finally reached after the wet film thickness of a certain thickness is constructed on the surface. Volume solids can be measured by:
ISO3233-1999 paint and varnish - by measuring the dry film density of non-volatiles per unit volume
GB9272-1988 liquid coating non-volatile sub-capacity determination (equivalent to ISO3233-1984)
ASTMD2697 transparent non-colored paint The test criteria for the weight of volatile
coatings are:
GB/T6750-2007 "Measured gravity bottle method for color paint and varnish density




5, paint users how to compare the economics of the paint manufacturers
Some paint users are also aware that the theoretical costs declared by paint manufacturers alone is not easy to accurately reflect the actual situation, so they have come up with some methods to compare, such as paint samples provided by paint manufacturers on-site spray testing, record paint consumption, average dry film thickness and coating area, and then calculate the comparison. This method is complex to operate, the error is also relatively large, time-time.
in fact, customers have a better way of comparison: that is, to test the volume of the coating solids and proportions, according to the above-mentioned standards entrusted to the authority. Then calculate the theoretical cost per square on your own.