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Measurement of Ra value of coating

2006

I would like to know, which is the world wide standard method for checking Ra value-

I want to check Ra value of CED (Cathodic electrodeposition) primered surface , for which I require following information

a) In automobile industry, world wide, which is the common equipment is used to measure Ra value ?

b) What is travel length ( what is world wide standard length?)
c) What is the speed ?
d) What is acceptance level of CED coated / finish painted panel for Ra value in reputed automobile industries ?

Thanks & regards,

A.BHIJIT S BAPAT

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