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Ceilcote EJ-3 Elastomeric Joint Sealant 1 Gal
Ceilcote EJ-3 is a two-component, pourable polysulfide elastomer for chemical-resistant sealing of horizontal joints in concrete, tile, and brick floors. It cures to a tight-fitting synthetic rubber that keeps out water and many aggressive chemical solutions.
- Accommodates cyclic joint movement (keep design elongation within 25%)
- Excellent resistance to water and salts; good vs dilute acids, alkalis, and many solvents
- Pourable heavy liquid for horizontal control and expansion joints
$288.75
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Ceilcote EJ-3 Pourable Polysulfide Elastomeric Joint Sealant, 1 Gallon
This 1 gallon unit (3.785 L) of Ceilcote EJ-3 is the pourable pack for crews closing a limited run of horizontal joints, repair days, and smaller chemical-area floors that do not need a 5 gallon kit. Ceilcote EJ-3 is a two-component polysulfide elastomer. After cure it is a tight-fitting synthetic rubber that seals out water and many aggressive chemical solutions. Typical work is control and expansion joints in concrete, tile, monolithic, and acid-proof brick floors in chemical environments. Flexibility is meant for cyclic movement. Joint layout should keep elongation within 25% during temperature extremes. Adhesion is good to concrete, steel, and other common construction materials. Elongation is 200% (ASTM D-412) and hardness is Shore A 30-35. Service temperature is -50°F to 200°F. For long joint campaigns and plant shutdowns, use the Ceilcote EJ-3 5 gallon elastomeric joint sealant. Ceilcote EJ10 trowel composite joint sealant is a different rubberized-asphalt compound, not another pack size of EJ-3.
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 1 gal unit (3.785 L). Also published as a 5 gal unit (18.92 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 1 gallon unit compare to the 5 gallon unit?
The 1 gallon unit (3.785 L) is the same pourable Ceilcote EJ-3 polysulfide as the 5 gallon unit (18.92 L). Use 1 gallon for limited joint runs and repair days. Step up to the Ceilcote EJ-3 5 gallon elastomeric joint sealant when the floor campaign is larger.
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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