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Product Info for UNITHANE SX-6503

UNITHANE SX-6503 is a self-crosslinking firm, but flexible anionic, NMP-free and APEO free dispersion of an aliphatic polyurethane. UNITHANE SX-6503 offers exceptional resistance to stains, various chemicals, and UV degradation. The UNITHANE SX-6503 is ideally suited for use in applications requiring advanced physical properties, soil resistance, and some flexibility. The self-crosslinking mechanism of the UNITHANE SX-6503 cures at room temperature, but is accelerated by applying heat. The performance of UNITHANE SX-6503 can be further enhanced by blending with other Union polyurethane dispersions or by the use of external crosslinking.

FILM PROPERTIES ( 3 wet mils, cured at 80°C for 1 minute):

Gloss (60 degree angle): 90.5

Wet Denim Rubs: 4+ (AATCC Stain Scale)

Industrial Applications:

This product is recommended for: Leather, Automotive Interiors – Leather

Product Characteristics:

Product Class Solids % pH Viscosity @25ºC Gloss VOC g/L Tensile (D-882) Elongation (%) Modulus 100% (psi) Sward Hardness
Finishing 30 – 32 7.5 – 10.0 10 – 500 cps.

Full product details can be found in this section:


Special Features: NMP-Free (NF)
Application Types – Leather: Bright, Automotive, Aircraft


Total Solids %: 30 – 32
pH: 7.5 – 10.0
Viscosity @ 25⁰ C: 10 – 500 cps.
VOC (% of total weight): 7.5-7.7
Specific Gravity: 1.01-1.04
Appearance: Semi-translucent
Freeze/Thaw Cycles (D-2243): 0
Shelf Life: Maximum 12 months
Harmonize Tariff Number: 3909.50.6000

Certified to ISO-9001:2015


The information and data contained herein are believed to be correct. However, we do not warrant either expressly or by implication the accuracy thereof.