Paint chemicals

Performance Features

Standard for industrial coating, Economy grade

Main Applications

Industrial coatings

Medium and Low Polyol Resins: Properties and Applications

Table 1: Key Characteristics Comparison

Property	Medium Polyol Resins	Low Polyol Resins
Hydroxyl Value (mg KOH/g)	100-200	30-100
Molecular Weight	1.000-3.000	500-1.500
Viscosity @25°C (cPs)	2.000-10.000	500-3.000
Functionality	2-3	1-2
Typical Cure Systems	Isocyanates, melamines	Isocyanates

Table 2: Performance Attributes

Parameter	Medium Polyol	Low Polyol
Film Hardness	High	Medium
Flexibility	Moderate	Excellent
Chemical Resistance	Excellent	Good
Cure Speed	Fast	Slow
Crosslink Density	High	Low

Table 3: Application Areas

Industry	Medium Polyol Uses	Low Polyol Uses
Coatings	Industrial finishes	Flexible coatings
Adhesives	Structural bonding	Elastic adhesives
Elastomers	–	Soft TPEs
Composites	Matrix resins	Impact modifiers
Foams	Rigid foams	Flexible foams

Table 4: Formulation Guidelines

Component	Medium Polyol (%)	Low Polyol (%)
Resin Base	60-80	50-70
Crosslinker	20-40	30-50
Additives	1-5	1-5
Catalysts	0.1-1.0	0.1-0.5
Fillers	0-30	0-20

Table 5: Cured Material Properties

Test	Medium Polyol	Low Polyol
Tensile Strength (MPa)	20-40	5-15
Elongation at Break (%)	50-150	200-500
Shore Hardness	D50-D70	A60-A90
Tg (°C)	40-80	-20 to 30
Water Absorption (24h)	0.5-2%	1-3%

Medium and low polyol resins offer distinct performance profiles suitable for different industrial requirements. Medium polyols provide harder, more chemical-resistant materials, while low polyols deliver superior flexibility and elongation. Selection depends on the desired balance between mechanical strength and elasticity in the final application.