Product Data Sheet
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Sikadur®-51 NS

Flexible epoxy control-joint sealer/adhesive

Sikadur®-51 NS is a 2-component, non-sagging, solvent-free, moisture-tolerant, flexible epoxy control joint sealer and adhesive.

  • 2 to 1 ratio ensures easy mixing, easy handling
  • An adhesive with excellent flexibility
  • Excellent durability
  • Conforms to ACI 302.1R (4.10-Joint Materials)
  • Shock-absorbent cure
  • Prevents deterioration of control-joint edges
  • Use as a security sealant
Product Data Sheet
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Usage

  • Use to fill vertical and overhead non-moving, saw-cut construction control joints and cracks
  • Use as a flexible adhesive
 

Advantages

  • 2 to 1 ratio ensures easy mixing, easy handling
  • An adhesive with excellent flexibility
  • Excellent durability
  • Conforms to ACI 302.1R (4.10-Joint Materials)
  • Shock-absorbent cure
  • Prevents deterioration of control-joint edges
  • Use as a security sealant

Packaging

3 gal. (11 L) units

Color

Concrete gray

Product Details

Product Information

Shelf Life

24 months in original, unopened containers

Storage Conditions

Store dry at 40–95 °F (4–35 °C).

Condition material to 65–85 ° F (18–29 °C) before using.

Viscosity

Comp. ‘A’  300,000-350,000 cps.
Comp. ‘B’  29,000-31,000 cps.
Mixed Non-sag paste
Technical Information

Shore A Hardness

75–80 (28 days)

(ASTM D-2240)

73 °F (23 °C)
50 % R.H.

Shore D Hardness

30–40 (28 days)

(ASTM D-2240)

73 °F (23 °C)
50 % R.H.

Tensile Strength

650 psi (3.9 MPa) (14 days)

(ASTM D-638)

73 °F (23 °C)
50 % R.H.

Strength at % elongation

2.5%           50 psi (0.35 MPa)

5%              90 psi (0.62 MPa)
10%            160 psi (1.1 MPa)

Application

Application Information

Mixing Ratio

Component ‘A’: Component ‘B’ = 2:1 by volume.

Pot Life

1–1.5 h

Cure Time

Tack-Free Time: 7–8 h
Consumption

Coverage

1 gal. will yield 231 in3 or will fill 102 ft. of 1/8 in. wide x 1.5 in. deep joint
Application steps

SUBSTRATE PREPARATION

Substrate must be clean and sound. It may be dry or damp, but free of standing water. Remove dust, laitance, grease, curing compounds, impregnations, waxes, foreign particles, disintegrated materials, etc., by mechanical means (i.e. sandblasting, high pressure water blasting).

MIXING

Pre-mix each component. It is critical to accurately proportion 2 parts Component ‘A’ and 1 part Component ‘B’ by volume into a clean pail or appropriately sized mixing container. Mix thoroughly for 3 minutes with a Sika Paddle on a low-speed (400–600 rpm) drill until uniform in color. Mix only that quantity which can be used within pot life.

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