i) Synthetic Primer Type-B by nature of its constituents will generate and provide effective bond between pipe surface on which it is applied and subsequent layer of asphalt or coaltar enamel or subsequent coating.
ii) It is the obligation and responsibility of primer supplier to ensure and guarantee/satisfactory performance of the primer with enamel(s) manufactured by different companies/source(s).
iii) This Primer shall comply with the requirements given in table-1 when tested by the methods specified and when dry, shall provide effective bond between the metal and the subsequent coatings, in accordance with the appropriate performance requirements given in this standard.
Characteristics Min Max
Viscosity (flow time) 4 mm cup at 23° C 40 60
Flash point (Able closed cup) °C 23 –
Volatile Matter (105° C to 110° C), % loss by mass – 75