Heavy Slack Wax has higher melting and congealing point , this grade has about 15% oil content. It is product of petroleum refining, in last years we consider that as waste of the refineries and will pay to get rid of this product but now it is so useful that customers will book & purchase slack Wax of most off the refineries, some month before producing. Packing is drum in summer time and also polyamide bags during cold seasons to prevent any deformation and leakage during delivery.