LOSP (Light Organic Solvent Preservative)
LOSP is a pre-primed timber product. It is not intended for use where the treated commodity comes into contact with the soil. LOSP-treated timber is produced in a dry state in its final form, and usually not cut or machined on the building site.
LOSP is H3 treated and the active ingredients prevent decay and insect attack are usually carried in a white spirit solvent system. This can result in the treated timber having a residual smell but it will dissipate relatively quickly, especially in our warm climate.