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Technical Specification of Di Basic Lead Stearate - DBLS Di Basic Lead Stearate is basic lead soap of commercial stearic acid, and is a versatile combined lubricant and heat stabilizer for P.V.C. It contains almost double the lead oxide equivalent of normal lead stearate and has a corresponding greater heat stabilizing ability. It is most frequently used as an adjust to other stabilizers when it helps to provide lubrication, particularly on the surface of machines working at high temperature and speeds. There is much less likelihood of migration or blooming occurring than with other metallic stearates. Appearance: Soft White Powder Density (Gms/cc): 1.9-2 Moisture: 1% Lead Oxide Equivalent: 52% to 55% Loss on ignition: 45% Min Free Fatty Acid: 0.5% Max Arsenic (As AS2O3) P.P.M: 2 Melting Point: 115C Molecular Weight: 1219.87 Di Basic Lead Stearate has a fairly low refractive index, and when used alone in P.V.C. has a low pigmenting value, producing a translucent product. It is suitable for both translucent and coloured compounds. It acts as a stabilizer lubricant, permitting increased rates of production by reducing friction. It is often used in conjunction with other metallic stearates, where it exhibits a greater efficiency as a heat stabilizer because of the synergistic effect. Di Basic Lead Stearate has wide application as a lubricant for plasticised P.V.C. compounds, particularly cable covering. For right P.V.C. application, it is necessary to use a well-balanced lubricant system. Technical Specification of Lead Stearate - LS Lead Stearate is the normal lead soap of commercial Stearic Acid. It is primarily of interest as a lubricant in P.V.C. compounds since it has only moderate heat stabilizing property when used alone. It is generally used in conjunction with other stabilizers and the proportion used must be carefully regulated to suit the working conditions and lubrication requirements. Over-addition can cause blooming on the surface as a result of the migration of Stearic Acid. Appearance: Fine White Powder Specific Gravity: 1.38-1.4 gms/ml Melting Point: 94C-108C Moisture: 1% Max Lead Oxide Equivalent: 29%-33% Loss on ignition: 65% Min Free Fatty Acid: 5% Max Molecular Weight: 773.51 Arsenic (As AS2O3) P.P.M.: 2 Lubricants are essential for the majority of P.V.C. fabrication methods by the very nature of the polymer. Lead Stearate acts as an efficient lubricant for many such processes, for example, extrusion, injection moulding and calendaring. Lead Stearate can be used as the sole lubricant ingredient for plasticized P.V.C. application on particular cable covering. While Lead Stearate confers only low thermal stability to P.V.C. when used alone, it shows strong synergism with other stabilizer compounds. For instance, in combination with Barium or Cadmium Stearates, it will give P.V.C. compounds increased clarity and adequate heat stability for low temperature and speed fabrication techniques.
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