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Product Info for UNITHANE HS-18


UNITHANE HS-18 is a newly developed, high solids (45%), pure waterbased aliphatic polyurethane resin designed as a basecoat to give excellent fill and coverage. UNITHANE HS-18 forms a very soft, flexible polymer film with low surface tack and excellent print retention and cut-thru resistance. This resin is unique in the fact that it has 100% recovery after 1000% elongation, which provides excellent elasticity and “finish memory”, when used as a basecoat on split and grain leathers.

UNITHANE HS-18 is designed as a high solids, filling basecoat. This may reduce the number of total coats needed for finishing and lead to reduced cycle times and more efficient manufacturing. UNITHANE HS-18 has excellent flexing properties to include dry, wet and cold flex (-20°C) as well as cold impact testing at -30°C.

Suggested application method is to roll coat. For starting point formula, contact your Union Specialties Inc. representative.

Industrial Applications:

This product is recommended for: Leather

Product Characteristics:

Product Class Solids % pH Viscosity @25ºC Gloss VOC g/L Tensile (D-882) Elongation (%) Modulus 100% (psi) Sward Hardness
Finishing 42.5 – 46.5 8.5 – 10.5 500 – 800 cps 30 – 85 26-28 1430 psi 620% 415 psi 5.72

Full product details can be found in this section:


Special Features: NMP-Free (NF), Low VOC (<100 g/L)
Application Types – Leather: Splits


Total Solids %: 42.5 – 46.5
pH: 8.5 – 10.5
Viscosity @ 25⁰ C: 500 – 800 cps
VOC (Grams/Liter): 26-28
VOC (% of total weight): 2.6-2.8
Specific Gravity: 1.01-1.04
Appearance: Opaque
Gloss (60): 30 – 85
Freeze/Thaw Cycles (D-2243): 0
Shelf Life: Maximum 12 months
Mix Well Before Using
Harmonize Tariff Number: 3909.50.6000


Film Appearance after Curing: Clear
Tensile (D-882): 1430 psi
Tensile at 100% Elongation: 415 psi
Elongation (D-882): 620%
Cold Crank (ISO 17233): below -30°C
Softening Point: 125°C
Pencil Hardness (D-3363): 4H
Sward Hardness (D-2134): 5.72
Impact Resistance (D-2794): No damage at 160 psi (Direct and Reverse)
Mandrel Bend (D-522): Pass 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1
Dry Time (D-5895): 60 min
Hydrolysis Resistance (200 hours, 70ºC, 95% RH): Retained 84% of Tensile Properties


note: 5= no damage, films dried for 15 minutes at 80ºC, then equalized at room temp for 7 days.
Water: 5
Acetic Acid: 5
Ammonia: 4
Methyl Ethyl Ketone: 2
2-Propanol: 3
Toluene: 5
Gasoline: 5


Cold Roll Steel – Unpolished: 3B
Aluminum – Untreated: 0B
ABS – Untreated: 4B
Polycarbonate – Untreated: 4B
Nylon – Untreated: 3B
HDPE – Untreated: 0B

Certified to ISO-9001:2015

Contact Information:

3 Malcolm Hoyt Drive
Newburyport, Massachusetts 01950 ∙ U.S.A.
Tel: (978) 465-1717 ∙ Fax: (978) 465-4194
E-mail: ∙


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

[Please note that due to the Chinese Trademark Office opposition decision, products destined for the China marketplace in the category of “Adhesives for Industrial purposes: Polyurethane,” will NOT contain the trade name “UNITHANE” but will be labeled only with the letter or number designation. Please contact us if there are any questions. Thank you.]