Soft, aliphatic, water-borne, polyurethane dispersion.

Suggested Uses: HD-4638 was designed for use in textile applications as a versatile polyurethane coating. Due to its overall properties, HD-4638 can be used as a finish or a coating for many textile applications. This product is ideally suited for use as an anti-fray finish on textile fabrics that must have a soft hand. HD-4638 is also suitable for textile coating applications that require excellent low temperature flexibility and crack resistance.

Characteristics:
  • Superior flexibility
  • Soft, tough, flexible, dry film
  • Excellent UV resistance
  • Very good abrasion resistance
  • Superior low temperature flexibility and crack resistance
  • High melting point (320 ºF)
  • Good strength properties
Unit of Measure

Physical Properties

Solids

N/A 38 %

Solids Tolerance

N/A ± 1 %

Viscosity

N/A 50 to 500 cps

pH

N/A 7.5 to 10.0

Density

N/A 8.7 lb/gal

Softening Point

N/A 320 ºF

Volatile Organic Compounds (VOC) Content (As Supplied)

N/A 16 g/L

Tensile Properties

Elongation

N/A 600 %

Tensile Strength

N/A 3000 psi

100 % Modulus

N/A 770 psi

200 % Modulus

N/A 1050 psi

300 % Modulus

N/A 1380 psi

Note

N/A Tested at 20 Inches/Minute

Application

N/A Spray or pad - solids may be adjusted for optimum add-on. May be thickened with HA-900 for knife coating.

Curing

N/A Excellent strength properties as supplied. Melamine-formaldehyde crosslinkers, such as Cytec’s Cymel 385 (3 - 6 phr), will provide improved performance.