Armorflex 962/963 Flexible Joint Compound is a 100% solids, polysulfide epoxy compound. It has excellent elongation properties and will bond to almost any surface. AF 962/963 is especially useful for expansion joints, tiltwall joints, along caulk lines, and in other locations where both waterproofing and control of movement are required.

Various aggregates and fillers can be added to Armorflex 962/963 to improve appearance, increase abrasion resistance, or meet engineering and architectural specifications. Some custom colors are available by request.

Chemical Resistance

Armorflex 962/963 has excellent chemical resistance to caustics, mild steam, dilute acids, petroleum solvents, water and salts. Contact the Wil-Cor, Inc. Technical Department for chemical resistance in specific service conditions.

Chemical Resistance (after 7 days at 80° F)

Acetic (5%) Excellent
Citric (10%) Excellent
Hydrochloric (37.6%) Good (some discoloration)
Lactic (5%) Excellent
Nitric (10%) Excellent
Phosphoric (85%) Fair (surface attack)
Sulfuric (50%) Excellent


Ammonium Hydroxide (10%) Excellent
Sodium Hydroxide (50%) Excellent


Butyl Acetate Excellent
Ethyl Acetate Excellent
Methyl Isobutyl Ketone Excellent
Mineral Spirits Excellent
Sour Crude Oil Excellent
Toluene Excellent


Sodium Hypochlorite (5%) Excellent
Tap Water Excellent


  • Flexes more than 50%, while maintaining 100% bond – holds its bond in expansion and contraction.
  • Cures in the presence of moisture – can be applied in dry or damp conditions.
  • Easy to mix and apply – adaptable to many applications and service conditions.
  • Produces impervious barrier – prevents contamination from water, solvents, and a variety of chemicals.

Physical properties

Color Gray (others on request)
AF 962 (trowelable) Paste
AF 963 (Pourable) Medium Liquid
Pot Life @ 77 °F 30-45 min.
Cure Time @ 77 °F 48 hrs.
Mixing Ratio(by vol.) Resin (part A):Cure(part B) 1:2
Weight/Gallon 10.0 lbs
Solids Content (by weight) 100%
Flash Point (C.O.C.) 175 °F
Viscosity, Brookfield @ 77° F
AF 962 100,000 cps
AF 963 1,500 cps
Specific Gravity
AF 962 1.2
AF 963 1.1
Operating Temperature Range
Continuous High 150 °F
Continuous Low -300 °F
Elongation 55%
Shore Durometer (scale A) 87
Tensile Strength Ultimate 210 psi

Surface Preparation

for concrete

  • 1Remove old expansion joint material, coatings, patchwork, and any surface contamination such as form oil, dirt, grease or salts.
  • 2Sandblast, waterblast, or mechanically etch the surface to remove laitance and to roughen the surface.
  • 3Remove any sand, dust or standing water.
  • 4Test for proper pH and neutralize if necessary.

for steel

  • 1Remove old expansion joint material, coatings, patchwork, and any surface contamination such as oil or grease. Solvents or detergents may be used to clean the surface.
  • 2Sandblast to white metal to remove all rust and oxidation.
  • 3Remove any sand, dust, or standing water.
  • 4Test for proper pH and neutralize if necessary.


A prime coat of Armor Plate 901 Tack or Prime may be applied to the surfaces to be filled if excessive movement, uncertain surface preparation, or doubtful bonding ability is anticipated.


Armorflex 962 and 963 are two-component systems which are mixed just prior to application. The mixing ratio is 1 part Resin (part A) to 2 parts Cure (part B). The two parts are mixed in a clean container until the mixture is thoroughly blended and of a proper consistency. AF 962 will have a paste consistency and AF 963 will be a pourable liquid.


Armorflex 962 is applied to properly prepared surfaces by trowel or caulking gun. Armorflex 963 is poured into properly prepared joints.
Tools and equipment used may be cleaned with Armor Plate Equipment Cleaner. DO NOT use Armor Plate Equipment Cleaner for personal cleanup.
The proper depth of the sealant is approximately one-half the width of the joint. The sealant depth should not be greater than the width of the joint. The joint width should be designed so that the maximum elongation of the joint sealant will not exceed 50% of the original width. The distance between expansion joints and the expected variance in service temperatures should be considered in designing the proper joint width. The Joint Width Design table below will aid in designing joint widths.

Joint Width Design

Length between Joints (ft) Service Temp. Variance (°F)
15 30 45 60 75 90 115
0 1/4 1/4 1/4 3/8 3/8 1/2 5/8
20 1/4 1/4 3/8 1/2 1/2 5/8 3/4
40 1/4 3/8 1/2 5/8 3/4 3/4 7/8
60 3/8 1/2 5/8 3/4 7/8 1 1
80 1/2 5/8 3/4 1 1
100 5/8 3/4 7/8 1 1
Joint widths are to the nearest 1/8 in. For variables between those listed in the above table, increase the value to the next highest shown to find the proper joint width.

Packaging Armorflex 962/963 is packaged as a two-component unit and is labeled as follows:

Component A-Resin Component B-Cure
Stock Unit Sizes 1-1/2-gal. and 7-1/2 gal.
Custom Colors Available on Request*

*A minimum quantity order or set-up fee may be required for special orders.

Shelf Life

Armorflex 962/963 has a minimum shelf life of one year when stored under normal warehouse conditions and kept tightly sealed. Material should be stored only on pallets or shelving in ventilated areas. DO NOT allow material to freeze.

Coverage and Estimating

Armorflex 962 and 963 provide a theoretical coverage of 231 cu. in per gallon. The following table can be used to estimate the amount of coverage provided for a given joint size:

Yields When Filling Joints
(Lineal Feet per Gallon)
Joint Width (Inches)



1/4 1/2 3/4 1 1-1/4 1-1/2
1/4 308.0
1/2 154.0 77.0
3/4 102.7 51.3 34.2
1 77.0 38.5 25.7 19.3
1-1/4 61.6 30.8 20.5 15.4 12.3
1-1/2 51.3 25.7 17.1 12.8 10.3 8.6
1-3/4 44.0 22.0 14.7 11.0 8.8 7.3
2 38.5 19.3 12.8 9.6 7.7 6.4
2-1/2 30.8 15.4 10.3 7.7 6.2 5.1
3 25.7 12.8 8.8 6.4 5.1 4.3


Armorflex 962 and 963 are intended for commercial or industrial use by trained personnel only. Follow these precautions carefully:

  • Wear protective clothing, gloves and goggles. Avoid prolonged or continuous contact with skin.
  • Use only in well ventilated areas.
  • Avoid breathing vapors.Avoid breathing vapors.
  • Keep containers closed when not in use.


  • Corrosive Liquid
  • Causes eye and skin burns
  • Can cause allergic reaction
  • Do not get into eyes or skin or clothing
  • Avoid breathing vapor or mist

These products may cause skin sensitization or burns.
In Case of Skin Contact – Wash immediately and thoroughly with soap and water.
In Case of Eye Contact – Flush with water for 15 minutes and seek immediate medical attention.