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The thermoplastic is supplied in "poly" bags that will melt when put in the heating pot, i.e. you put the whole bag into the heating pot.
The thermoplastic consists of,
a light coloured aggregate (silica sand),
white pigment (titanium dioxide),
glass beads,
and it is all held together with a thermoplastic resin

Glass beads of a suitable grade / quality for the contract specification requirements are supplied in bags as shown.
Glass beads are applied to the surface of the still hot thermoplastic to ensure the initial retro-reflectivity requirement of the road markings is achieved.

Until quite recently in the UK the thermoplastic was made to a BS 3262 generic specification that laid down a "recipe" composition of stated quality components to which the the material must comply, and there will still be many term maintenance contracts where BS 3262 will still be the specification in force.