Armor Plate 990 is a trowelable grade epoxy grout that is ideal for a variety of maintenance and construction projects. AP 990 is versatile because it forms an impervious chemical and moisture barrier that inhibits corrosive and oxidizing processes at rebar and anchor bolts.

AP 990 is primarily used for grouting rebar and anchor bolts. It is also used as a putty material, as a patching compound for concrete, steel, and wood, and as a repair material for pump housings.

AP 990 is recommended for anchoring equipment such as compressors, diesel engines, printing presses, power generators, hydraulic presses, turbines and pumps.


  • May be troweled onto floors, walls and overhead surfaces.
  • Exhibits outstanding strength and tenacious bonding to wood, steel, glass, ABS and other non-porous surfaces.
  • Resists a wide variety of chemicals
  • Simplified application because of extended pot life and non-critical mixing ratios.
  • Can be applied in damp or dry conditions. Cures underwater if No. 5 sand (sugar sand) is added.
  • Can be used to:
  • Join and repair concrete pipe
  • Fill voids in wood, steel or concrete
  • Bevel welds
  • adhere pipe saddles
  • grout bolts and rebar into walls and ceilings
  • repair fiberglass and pump housings

Chemical Resistance

Armor Plate 990 forms a chemical barrier that is resistant to a wide variety of chemicals, including caustics, dilute acids, salt solutions, water, steam and petroleum solvents. Contact the Wil-Cor, Inc. Technical Department for chemical resistance in specific service conditions.

Physical Properties

Color (mixed) light Gray
Mixing Ratio (by vol.) Resin (pt A) : Cure (pt B) 1 : 1
Flashpoint (C.O.C.)
Resin (part A) 210 °F
Cure (part B) 180 °F
Compressive Strength 8,000 psi
Operating Temperature Range
Continuous High 200 °F
Continuous Low -275 °F
Barcol Hardness (Scale E) 80
Bond to Steel 1,200 psi
Bond to Concrete Greater than Concrete

Surface Preparation

All surfaces to which the AP 990 is applied must be clean and free of dust, oil, grease or rust.


Mix Armor Plate 990 Resin (part A) and Cure (part B) in equal proportions, by volume. Stir the mixture for at least 2 minutes, until a homogenous mixture is obtained. Mechanical mixing is recommended because of Armor Plate 990\\\\\\\’s viscosity.

If Armor Plate 990 is to be used under water, mix fine, dry No. 5 sand (sugar sand) with the mixed batch in proportions of 3-4 parts sand to 1 part resin.


Armor Plate 990 may be applied with a trowel, tongue depressor, or putty knife. When placing AP 990 in anchor bolt or rebar holes, place a small amount of grout at the end of the hole, as well as on the bolt or rebar. This method will assure that the anchor bolt or rebar is completely surrounded by the grouting material.

Test Data

Table One
Dowel Diameter: D(in.) 3/8 1/2 5/8 3/4 7/8 1
Hole Diameter: A(in.) 3/4 3/4 1 1 1.5 1.5
Hole Depth: B(in.) 6 6 8 8 12 12
Minimum Distance From Edge: C(in.) 4 4 4 4 5 5
Total Load (lbs) 2,200 4,000 5,750 8,500 11,000 11,500
Load failure in these tests occurred in the concrete,
not the AP 990, anchor bolts or rebar.
Table Two
Bolt Diameter: D(in.) 3/8 1/2 5/8 3/4 7/8 1
Hole Diameter: A(in.) 3.4 3.4 1 1 1.5 1.5
Hole Depth: B(in.) 6 6 8 8 12 12
Minimum Distance From Edge: C(in.) 4 4 4 4 5 5
Total Load (lbs) 2,200 4,000 6,000 8,500 11,500 14,000
Load failure in these tests occurred in the concrete,
not the AP 990, anchor bolts or rebar.


Armor Plate 990 is available in caulking tubes and stock sizes of 2-quart, 2-gallon and 10-gallon units.

Coverage and Estimating

The theoretical coverage of the Armor Plate 990 is 231 cu. in./gal. Typical coverage is:

1/32 inch layer 51 sq. ft. per gal.
1/16 inch layer 25 sq. ft. per gal.
1/8 inch layer 13 sq. ft. per gal.
1/4 inch layer 6.4 sq. ft. per gal.

For other applications, the amount of grout (with aggregate) needed, without consideration of losses during mixing and application, is determined from the following formula:

G is the Amount of Grouting Material needed (gallons)
r1 is the Radius of the Holes to be filled (inches)
r2 is the Radius of the Bolt or Rebar (inches)
d is the Depth of the Hole (inches)
n is the Number of Holes to be filled

Shelf Life

The shelf life of AP 990 is a minimum of one (1) year. AP 990 may still be usable after 2 or 3 years if kept in tightly sealed containers in a dry location. After one year both A & B are dryer and harder to mix due to fillers absorbing the resin. After one year of shelf life it is recommended that a test batch be mixed to determine its reactivity.

Freight Classification

Plastic Liquid, N.O.S.
F.O.B. – Pasadena, Texas
May be air freighted

Material Requirements for Grouting Dowels

Material Requirements for Grouting Dowels
Diameter (inches) Area (sq. in.) Diameter (inches) Area (sq. in.)
0.25 0.05 2.25 4.00
0.50 0.20 2.50 4.90
0.75 0.45 2.75 5.95
1.00 0.80 3.00 7.05
1.25 1.25 3.25 8.30
1.50 1.75 3.50 9.60
1.75 2.40 3.75 11.05
2.00 3.15 4.00 12.55
1″ dowel in a 1.5″ hole that is 12″ deep
How much grout is needed?
From the chart above:
1″ dia. dowel: 0.80 sq. in.
1.5″ dia. hole: 1.75 sq. in.
Void area (area to be filled with grout):
(1.75-0.80) sq. in. = 0.95 sq. in of void area.
0.95 sq. in. X 12 in. = 11.4 cu. in. of grout needed.
Miscellaneous Data
1 gal. = 231 cu. in. 1 gal. = 144 sq. in.
1 gal. = 128 fl. oz. 1 sq. yd. = 9 sq. ft.
7.5 gal. = 1 cu. ft. 1 mil = .001 in.
1 cu. ft. = 1728 cu. in. 100 lbs. sand = approx. 7 gal.


  • Causes eye irritation.
  • May cause allergic skin reaction.
  • Avoid breathing vapor or mist
  • Do not get into eyes, on skin or clothing.