Tribasic Lead Sulphate (TBLS)
Powerful non-lubricating primary heat stabilizer — stable at elevated temperature without decomposition, so finished products stay sound and free of porosity.
Overview
Grade SCI-180-TBLS
Tribasic lead sulphate (TBLS) is the workhorse primary heat stabilizer of lead-based PVC formulation — exceptionally powerful at low cost. It is stable at elevated temperature without decomposition, ensuring sound products free of porosity, and it is pulverized to a narrow particle distribution for good dispersion. Being non-lubricating, it pairs with lubricating co-stabilizers such as DBLS, DBLP, lead stearate and calcium stearate in rigid pipe and fittings, wires and cables, soil pipe, rigid profiles, floor coverings and reinforced suction hose.
Key Properties
- Exceptionally powerful primary stabilizer at low cost
- No decomposition at processing temperature — porosity-free product
- Non-lubricating: full freedom over the lubricant package
- Narrow particle distribution for good dispersion
Applications
Related Products
Lead Stearate (LS)
Lubricating co-stabilizer — greater lubricity than DBLS with better dispersion thanks to its lower melting point, giving rigid and flexible PVC a smooth surface.
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Dibasic Lead Stearate (DBLS)
High free-lead co-stabilizer plus high-temperature lubricant — it does not melt under normal service conditions, enabling long, fast production runs.
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Dibasic Lead Phosphite (DBLP)
Heat stabilizer and primary light stabilizer — excellent UV and weathering resistance with retention of physical properties after ageing.
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Dibasic Lead Phthalate (DBLPh)
High-temperature heat stabilizer for demanding flexible PVC — the choice for heat-resistant cable insulation and compounds that must survive sustained heat ageing. Distinct from DBLP (phosphite).
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Tribasic Lead Sulphate (TBLS) — frequently asked questions
Where are lead-based PVC stabilizers still used?
Lead-based stabilizers remain a proven, economical choice for many industrial PVC products — such as wires and cables, drainage pipe and profiles — where potable-water and food-contact rules do not apply.
Why choose a lead-based stabilizer?
Lead systems offer excellent long-term heat stability, very good electrical insulation and low cost per unit of stabilizing performance, which is why they held the default position in cable insulation for decades.
Do you also offer lead-free alternatives?
Yes — we manufacture calcium-zinc one-pack systems and can help you migrate from lead where regulation or customers require it.