Name: Polysulfide Flexibilizer PF-50 for Epoxy
Brand: Coatingsink
SKU: polysulfide-flexibilizer-pf50
Availability: InStock

Question 1

What is the recommended loading level of PF-50 in epoxy sealant formulations?

Accepted Answer

Typical loading is 10–30 phr relative to epoxy resin. At 15–20 phr, PF-50 delivers a good balance of flexibility (elongation >50%) and mechanical integrity; higher loadings up to 30 phr are used for highly flexible joint sealants and caulks where chemical resistance to fuels and solvents is also required.

Question 2

Does PF-50 interfere with amine hardener cure in two-component epoxy systems?

Accepted Answer

No. PF-50 co-reacts with the epoxy resin through its terminal thiol (–SH) groups, acting as both a flexibilizing co-reactant and a secondary chain extender. It is fully compatible with standard aliphatic and cycloaliphatic amine hardeners. Blend PF-50 into the epoxy component before mixing with the amine; the DBP carrier also lowers mixed viscosity for void-free joint filling.

Question 3

How does PF-50 improve chemical resistance compared to rubber or CTBN tougheners?

Accepted Answer

Polysulfide backbones provide intrinsic resistance to aliphatic hydrocarbons, jet fuels, and dilute acids superior to CTBN-modified epoxies, making PF-50 the preferred flexibilizer in aerospace joint sealants, fuel-resistant tank coatings, and oil-field downhole applications where CTBN performance is marginal.

SH Content	~0.9%
Active Content	50% in DBP
Density (25°C)	1.15 g/mL
Viscosity (25°C)	4,000–8,000 mPa·s
Recommended Dosage	10–30 phr

Polysulfide Flexibilizer PF-50 for Epoxy

Specifications

FAQ

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