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Description
Uses: Used for PVC heat stablizer in plastic industry.
Dibasic Lead Phosphite (Diphos) is produced and supplied as a fine white or slightly brown powder. With a lead (Pb) content of 83.5%, it confers excellent long term weather protection on both rigid and flexible PVC compounds. It has a high refractive index which imparts a higher opacity than other basic lead compounds, smell sweet. Indissoluble in water but dissoluble in acid, changes into ashblack at 200?? and changes into yellow at 450??. Will burn when meeting fire.
Typical Applications
Diphos is particularly effective in inhibiting the degradation of PVC exposed to UV radiation, thus it may be used as the primary stabiliser in products intended for outdoor applications. It is effective in both rigid and flexible formulations for mouldings, extrusions and calendered products such as cable sheathing, rainwater fittings and window frame profiles. Diphos is very effective when used in conjunction with Tribasic Lead Sulphate.
Typical Properties
| Item | High Grade | First Grade | Acceptable Quality Grade |
| PbO% | 89.0-91.0 | 89.0-91.0 | 88.5-91.5 |
| Phosphorous acid% | 10.0-12.0 | 10.0-12.0 | 9.0-12.0 |
| Moisture% | 0.30max | 0.40max | 0.6max |
| Residue through 75um screen% | 0.30max | 0.40max | 0.8max |
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