Product Data Sheet
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Sikadur®-21 Lo-Mod LV

Sikadur®-21 Lo-Mod LV

Low-modulus, low-viscosity, epoxy resin binder

Sikadur®-21 Lo-Mod LV, is a 2-component, 100 % solids, moisture-tolerant, epoxy resin binder. It conforms to the current ASTM C-881 Type II, Grade 1, Class B & C and AASHTO M-235 specifications.

  • Tolerant to moisture both before and after cure
  • Convenient easy mix ratio A:B = 1:1 by volume
  • Excellent strength development
  • Low viscosity gives you easy handling, high-yield epoxy mortar
  • Material is USDA-certifiable for incidental food contact
Product Data Sheet
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Usage

Use as a binder for epoxy mortar for patching and overlays.  

Advantages

  • Tolerant to moisture both before and after cure
  • Convenient easy mix ratio A:B = 1:1 by volume
  • Excellent strength development
  • Low viscosity gives you easy handling, high-yield epoxy mortar
  • Material is USDA-certifiable for incidental food contact

Packaging

4 gal. (15 L) units

  

Note: Part A of the Sikadur® 22 Lo-Mod, Sikadur® 22 Lo-Mod FS and Sikadur®-21 Lo-Mod LV is a universal component of these three products

Color

Clear, amber

Product Details

Product Information

Shelf Life

2 years 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

Approximately 1,000 cps.

 
Technical Information

Compressive Strength

Mortar   1:6Neat
40 °F (4 °C)73 °F (23 °C)90 °F (32 °C)73 °F (23 °C)
4 hour--

500 psi

(3.4 MPa)

-
8 hour-

400 psi

(2.7 MPa)

2,200 psi

(15.1 MPa)

-
16 hour

20 psi

(0.13 MPa)

2,100 psi

(14.4 MPa)

4,600 psi

(31.7 MPa)

116 psi

(0.80 MPa)

1 day

40 psi

(0.27 MPa)

2,600 psi

(17.9 MPa)

4,700 psi

(32.4 MPa)

1,900 psi

(13.1 MPa)

3 day

1,400 psi

(9.6 MPa)

4,900 psi

(33.7 MPa)

5,500 psi

(37.9 MPa)

6,700 psi

(46.2 MPa)

7 day

3,500 psi

(24.1 MPa)

5,400 psi

(37.2 MPa)

6,200 psi

(42.7 MPa)

9,000 psi

(62.1 MPa)

14 day

4,500 psi

(31.0 MPa)

6,000 psi

(41.3 MPa)

6,200 psi

(42.7 MPa)

9,100 psi

(62.7 MPa)

28 day

4,600 ps

(31.7 MPa)

6,100 psi

(42.0 MPa)

6,200 psi

(42.7 MPa)

9,200 psi

(63.4 MPa)

Material cured and tested at the temperatures indicated.

(ASTM C-579) (73 °F (23 °C) 50 % R.H.)

Modulus of Elasticity in Compression

Mortar 1:6

Neat

28 day7.6 x 105 psi (5,240 MPa)2.58 x 105 psi (1,779 MPa)

Flexural Strength

14 dayMortar 1:6Neat

2,300 psi

(15.8 MPa)

9,600 psi

(66.2 MPa)

Modulus of Elasticity in Flexure

Mortar 1:6

Neat

14 day

1.2 x 106 psi (8,274 MPa)

2.98 x 105 psi (2,055 MPa)

Tensile Strength

Mortar 1:6

Neat

14 day

1,300 psi

(8.9 MPa)

5,800 psi

(40.0 MPa)

Shear Strength

Mortar 1:6

Neat

14 day

2,000 psi

(13.7 MPa)

5,670 psi

(39 MPa)

Slant Shear Strength

2 days

(dry cure)

1,100 psi

(7.5 MPa)

14 days

(moist cure)

1,600 psi

(11 MPa)

Abrasion Resistance

14 day

Mortar 1:6

Weight loss, 1,000 cycles (H-22 wheel; 1,000 gm. weight)

4.1 gm

Water Absorption

7 day (24 hr immersion)0.26 %
 

Application

Application Information

Mixing Ratio

Component A:Component B = 1:1 by volume

Pot Life

Approximately 25 minutes. (200 gram mass)

Cure Time

Tack-Free Time: Approximately 3 hours;

at 90 °F (32 °C) Approximately 2 hours
 

Applied Product Ready for Use

Traffic Time: 4–5 hours
Consumption

Coverage

Prime Coat - approximately 200-250 ft²/gal.

 

Mortar Binder - 1 gal. of mixed Sikadur® 21, Lo-Mod LV with the addition of 6 parts by loose volume of an oven-dried sand, yields approximately 924 in3.
Application steps

SUBSTRATE PREPARATION

Surface must be clean and sound. It may be dry or damp, but free of standing water. Remove dust, laitance, grease, curing compounds, impregnations, waxes and any other contaminants.

  

Preparation Work:
Concrete - Should be cleaned and prepared to achieve a laitance and contaminant free, open textured surface by blast cleaning or equivalent mechanical means.
Steel - Should be cleaned and prepared thoroughly by blast cleaning to white metal finish.

MIXING

Proportion equal parts by volume of Component ‘A’ and ‘B’ into clean pail. Mix thoroughly for 3 min. with Sika paddle on low-speed (400–600 rpm) drill until uniformly blended. Mix only that quantity that can be used within pot life.

  

To prepare epoxy mortar - Slowly add 6 parts by loose volume of oven-dried sand aggregate to 1 part of mixedSikadur®-21 Lo-Mod LV. Mix until uniform in consistency.

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