Lead salt stabilizer,Lead compounds, usually based on a mixture of lead salts have been very cost-effective
heat stabilisers for many years.
Advantages of lead stabilizers
Eexcellent thermal stability, long-term thermal stability, excellent electrical insulation, good weather resistance
and low price.
Disadvantages of lead salt stabilizers
Poor dispersibility, high toxicity and initial coloring. It is difficult to obtain transparent products and bright colors.
They lack lubricity and are prone to sulfur pollution.
Commonly used lead salt stabilizers are:
Tribasic lead sulfate is the most commonly used stabilizer. It is commonly used with lead bisphosphate. Because
of its non-lubrication, it needs a lubricant. Mainly used in rigid opaque PVC product
The thermal stability of dibasic lead phosphite is slightly lower than that of tribasic lead sulfate, but its weatherability
is better than that of tribasic lead sulfate. Dibasic lead phosphite is often used with tribasic lead sulfate, the amount
of which is generally 1/2 of that of tribasic lead sulfate.
The code name is DLS, which is not as good as tribasic lead sulfate and dibasic lead phosphite. It has lubricity.
It is often used with tribasic lead sulfate and dibasic lead phosphite, and the dosage is 0.5-1.5 phr.
(4) Lead stearate
Lead stearate can be used as thermal stabilizer and lubricant for PVC, as auxiliary stabilizer, and as high
temperature lubricant and tbls.
Usally lead salt stabilizer is powder, easy to be absorbed into the human body, causing lead poisoning. In addition,
the use of a single lead stabilizer together will have a synergistic effect, increase thermal stability. At the same time,
a certain amount of internal and external lubricants are added to get lead based one pack stabilizer is more
suitable for processing of PVC plastic products.
These one-packs are tailored to suit the processing technique, primarily extrusion and injection moulding.