For 4 kV is every kind of insulation materials available, its not a 50 kV where only few good alternatives exist.
One is floor linoleum, those white colour elastic with no threads or textile inside. It stand at 2,5 mm thick about 40 kV. Other is teflon, even more strong. The ebonit (hard rubber) and getinax (paper in fenolic resin) - at least 8...10 kV is realistic for them. The PPE, PET, plexyglass, polystirol - good up to 10 kV, but last not likes the frequeancy over 30 MHz. Glass, quartz, ceramics - very strong and good, but difficult to form, need a diamond ring or torch. Powders like white-clay or silicon sand or MgO or AlO2 into 5% ortophosphoric acid - for 4 kV better to use about 1...2 cm, especially whilst not hardened well. Epoxides - any epoxide resin is more than good, however as lighter color as better voltage - up to 50 kV/cm or 5 kV/mm. The silicone rubbers including acetic tubes - second sort insulators but 1 kV/mm may be appropriate. Stirolic household glue-tubes (like liquid nails or instant mount etc) even better than acetic. Just the furniture lack, nitrolack, epoxy lack etc - very well up to 1 kV/mm or epoxy severe more. Just there is no restriction of any known insulation materials for Your case. Yes, and natural pitch is included however it is bit dirty material.
Thank for your reply sir,Are you designing to any particular standard? If so, you should use the creepage distance.
There is a table on page 4 of this document that might be of some use to you unless you need to design to a different standard.
View attachment 135781
You can check the bobbin specification to see whether your creepage distance is greater than 8 mm for points 4 KV apart.
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