Name: Polysulfide Polymer LP-32 (High MW)
Brand: Coatingsink
SKU: polysulfide-polymer-lp32
Availability: InStock

Question 1

What curing agents are used with polysulfide polymer LP-32?

Accepted Answer

LP-32 is cured by oxidative crosslinking of the terminal thiol (–SH) groups. Common curing agents include manganese dioxide (MnO2) paste, lead dioxide (PbO2) in aerospace applications, calcium peroxide, and epoxy resins for hybrid systems. MnO2 is the standard choice for construction sealants; MnO2/PbO2 blends are used in aerospace fuel-tank sealants where chemical resistance to jet fuel is critical.

Question 2

What is the significance of the higher molecular weight (~4000 g/mol) of LP-32 compared to lower-MW grades?

Accepted Answer

Higher molecular weight polysulfide gives higher initial viscosity (250–350 Pa·s), which means the uncured compound does not slump from vertical joints. Cured properties also benefit: elongation at break typically exceeds 250%, and modulus is lower than low-MW grades, providing excellent joint movement accommodation — important in expansion joints and double-glazing secondary seals that must withstand thermal cycling.

Density	1.27 g/cm³
Functionality	~2.0
–SH Content	2.0–2.5%
Molecular Weight	~4000 g/mol
Viscosity (25°C)	250–350 Pa·s (paste)

Polysulfide Polymer LP-32 (High MW)

Specifications

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