Elastuff® 120 Coating


Elastuff 120 Coating is a 100% solids ASTM Type V Butyl-polyurethane elastomer in a high-build, consistency. Elastuff 120 Coating is a two-component, 1:1 ratio material. Part A component contains the isocyanate. Part B component contains the curative solution.

This system provides a limited workable pot life, and therefore does not require specialized application equipment. Elastuff 120 Coating can be applied by trowel or can be thinned slightly to create a brush/roller-grade version for use on vertical and horizontal applications requiring either heavy or light film builds. Elastuff 120 Coating is a thermosetting polymer coating, which yields a dense, slick finish. The non-porous nature and excellent hydrolytic stability, coupled with resistance to cathodic disbondment, make Elastuff 120 Coating an excellent barrier to moisture and corrosion.

Designed to protect surfaces subjected to abrasion under immersion or wet environments, Elastuff 120 Coating can be used in potable water systems, salt water, various slurry systems, and numerous acid and base solutions.

The high tensile strength of Elastuff 120 Coating contributes to its resistance to abrasion and tearing. This toughness, combined with its high elongation properties, results in outstanding flexibility and impact resistance.

Sizes Available:

Two-component, 1:1 ratio material
Part A (Clear)
5 gallon (19 liter) bucket
50 gallon (204 liter) drum

Part B (Gray)
5 gallon (19 liter) bucket
50 gallon (204 liter) drum

Basic Uses and Advantages

Elastuff® 120 Coating is used as a sealant, caulk, filler, bonding agent and finish where hydrophobic, abrasion and chemical resistance properties are required. It is used over sealed concrete and primed metal surfaces, and also has excellent adhesion to high density polyethylene (HDPE) products when applied in conjunction with a heat treated surface. Typical applications utilizing Elastuff® 120 Coating include interior tank lining, waste/water containment, manhole repairs, flumes, reservoirs, valves, interior pipe, and other areas subjected to aqueous environments.

Elastuff® 120 Coating is a non-toxic lining and can also be used in applications associated with potable water containment. It has been tested and classified by UL in accordance with ANSI/NSF 61, Section 5, Barrier Materials. Any primers or topcoats use in potable water applications should also be certified.

Physical Properties

Mixing Ratio 1 part A to 1 Part B by volume
Flash Point Part A > 200°F (93°C)
Part B > 200°F (93°C)
Dry Time to Touch 4 hours tack free @ 75°F (24°C),
50% R.H.
Cure Time 90% after 24 hours @ 75°F (24°C),
50% R.H.
Mixed Usable
Pot Life
20 minutes @ 75°F (24°C), 50%
Water Absorption Less than 1% weight gain after 7
days [ASTM D570]
Tensile Strength 1,300 psi (±100) (9.0 MPa)
[ASTM D412]
Enlongation 150% (±20) [ASTM D412]
VOC < 25 g />L
Tear Strength 200 lbf/in (± 30) (35 N/mm)
[ASTM D 1004]
Hardness 30 to 40 Shore D @ 75°F (24°C)
40 to 50 Shore D @ 35°F (2°C)
[ASTM D2240]
Abrasion Resistance 20 to 30 mg weight loss with CS-17
wheel; 50 to 70 mg weights loss with
H-10 wheel using 1000 gm weight at
1000 revolutions [ASTM D4060]
Low Temperature Flexibility Passes ¼” (6 mm) mandrel bend @
-4°F (-20°C)
Low Temperature
Impact Resistance
Passes 160 inch pound (18.1 Joules)
direct @ -4°F (-20°C)
Standard Colors Gray, Black


All documents are U.S. English unless otherwise noted

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