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Ceilcote EJ-3 Elastomeric Joint Sealant 5 Gal
Ceilcote EJ-3 is a two-component pourable polysulfide joint sealant used on horizontal expansion and control joints in chemical process floors. Once cured it forms a flexible synthetic rubber with adhesion to concrete, steel, and common construction materials.
- 200% elongation (ASTM D-412) with Shore A hardness 30-35
- Resists water, salts, dilute acids, alkalis, and many solvents (not chlorinated solvents, ketones, or acetates)
- Horizontal joints in concrete, tile, monolithic, and acid-proof brick floors
$864.96
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Ceilcote EJ-3 Pourable Polysulfide Elastomeric Joint Sealant, 5 Gallon
Ceilcote EJ-3 in this 5 gallon unit (18.92 L) is the production pack for horizontal joint footage a 1 gallon kit will not cover: plant floors, long expansion-joint runs, and chemical process areas being sealed in one mobilization. It is the same two-component, pourable polysulfide elastomer. Once cured it forms a tight-fitting synthetic rubber with excellent resistance to water and salts, and good resistance to dilute acids, alkalis, and many solvents. Do not specify it where chlorinated solvents, ketones, or acetates are the exposure. Consistency is a heavy liquid, so it is for horizontal joints, not overhead work. Temperature resistance is -50°F to 200°F (-45°C to 93°C). Tensile strength is 180 psi. When the take-off is closer to a single gallon, use the Ceilcote EJ-3 1 gallon elastomeric joint sealant. For a trowelable rubberized-asphalt joint compound used on Ceilcote floors, see Ceilcote EJ10 trowel composite joint sealant.
Key Features
- Two-component, pourable polysulfide elastomer that cures to a tight-fitting synthetic rubber.
- Flexibility to accommodate cyclic joint movement; design joints so elongation stays within 25%.
- Good adhesion to concrete, steel, and other common construction materials.
- Water and salt resistance rated excellent; dilute acids, alkalis, and many solvents rated good.
- Not for chlorinated solvents, ketones, or acetates.
- Elongation 200% (ASTM D-412) and Shore A hardness 30-35 (ASTM D-2240).
- Tensile strength 180 psi (1.24 MPa) per ASTM D 412.
- Service temperature -50°F to 200°F (-45°C to 93°C).
- Heavy-liquid (pourable) consistency for horizontal joints. Manufacturer trowel grade EJ-4 is a different pack for vertical and overhead work.
- Used with CEILCOTE EJ3/EJ4 Primer and Ceilcote #2 Hardener (organic peroxide).
Applications
- Sealing joints in concrete, tile, monolithic, and acid-proof brick floors.
- Control and expansion joints.
- Chemical environments where a polysulfide joint seal is specified.
- Horizontal joints only. EJ-3 is a heavy liquid, not a paste caulk.
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer / Product Name | International Paint (AkzoNobel) CEILCOTE EJ3 pourable polysulfide expansion joint and crack sealant |
| TDS Issue Date | 18 June 2007 (file Ceilcote_EJ_3_eng_A4_20100506). Current published manufacturer TDS as of 25 August 2026; International Paint product page still lists this chemistry. Official document portal has no later TDS or SDS download. |
| Chemistry | Two-component pourable polysulfide elastomer. Hardener is an organic peroxide (Ceilcote #2 Hardener). |
| Consistency | Heavy liquid (pourable). For horizontal joints. |
| Elongation | 200% (ASTM D-412) |
| Hardness | Shore A 30-35 (ASTM D-2240) |
| Tensile Strength | 180 psi (1.24 MPa) (ASTM D 412) |
| Flexibility | Excellent, no age hardening |
| Temperature Resistance | -50°F to 200°F (-45°C to 93°C) |
| Chemical Resistance (TDS guide) | Water: excellent. Salts: excellent. Dilute acids: good. Alkalis: good. Solvents: good except chlorinated solvents, ketones, and acetates. Confirm exposure with Ceilcote for the specific chemical. |
| Working Time | 30-60 minutes at 75°F (24°C) |
| Cure at 75°F (24°C) | Open to traffic 24 hours. Full cure 72 hours. |
| Coverage | CEILCOTE EJ3/EJ4 approximately 200 in³/gal. Primer approximately 900 in²/gal. |
| Primer | CEILCOTE EJ3/EJ4 Primer, single component. Must be tack-free (approximately 20 minutes at 73°F / 23°C) before placing sealant. Re-prime if sealant is not placed within 24 hours. |
| Mixing Ratio (by volume) | EJ 3/4 Resin 1 gal (3.785 L) to #2 Hardener 8 oz (236.56 ml). Mix two minutes with a jiffy mixer on a low-speed (400 to 600 RPM) drill. Sealant temperature should be above 60°F (16°C) for mixing. |
| Flash Point (Pensky-Martens) | EJ3/EJ4 106°F (41°C). EJ3/EJ4 Primer 22°F (-5.5°C). #2 Hardener 175°F (79°C). |
| Packaging | Ceilcote EJ3 Pourable 5 gal unit (18.92 L). Also published as a 1 gal unit (3.785 L). |
| Storage / Shelf Life | Store cool, dry, covered, 50°-90°F (10°-32°C), away from fire hazards and direct sunlight. Minimum shelf life 12 months at 70°F (21°C). |
Product documents: CEILCOTE EJ3 AND EJ4 Expansion Joint and Crack Sealant (PDF)
Frequently Asked Questions
How does the 5 gallon unit compare to the 1 gallon unit?
The 5 gallon unit (18.92 L) is the same pourable Ceilcote EJ-3 polysulfide as the 1 gallon unit (3.785 L), packed for longer horizontal joint runs and plant-floor campaigns. Use the Ceilcote EJ-3 1 gallon elastomeric joint sealant when the day's take-off is closer to a single gallon.
What chemicals does Ceilcote EJ-3 resist?
The TDS rates water and salts excellent, and dilute acids, alkalis, and many solvents good. Exceptions are chlorinated solvents, ketones, and acetates. Treat the table as a guide and confirm the specific chemical with Ceilcote.
What is the working time and cure?
At 75°F (24°C), working time is 30-60 minutes. Joints are open to traffic in 24 hours and fully cured in 72 hours. Primer must be tack-free, about 20 minutes at 73°F (23°C), before placing sealant.
How much joint movement can it take?
Design joints so sealant elongation stays within 25% during extreme temperature change. Elongation capacity is 200% (ASTM D-412). Best joint shape is sealant depth equal to one-half the joint width, and depth should not exceed width.
Is Ceilcote EJ10 the same sealant in another size?
No. Ceilcote EJ10 trowel composite joint sealant is a two-part rubberized-asphalt compound for joints, cracks, and Ceilcote floor expansion joints. EJ-3 is a pourable polysulfide for horizontal chemical-resistant joints.
Does EJ-3 need a primer?
Yes. Prime joint walls with CEILCOTE EJ3/EJ4 Primer after abrasive blasting and placing a non-bonding backing material. If sealant is not placed within 24 hours of priming, re-prime the joint.
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