Weldtool Technologies | The Welding Wire Experts- titanium mill for fillers ,Weldtool Technologies is a speciality welding material supplier focusing upon unique and hard to find filler metals.US6214166B1 - Process for recycling fillers and coating ...The pigment and filler particles of the residual water sludge which are designated for use as fillers or pigments act as milling aids and dispersing aids to disrupt the agglomerates in the milling process.