CRACKLOCK E400L Injection epoxy
Ultra-low-viscosity structural injection epoxy for hairline and fine cracks
Ultra-low-viscosity epoxy that injects hairline cracks from 0.05 mm to 3 mm.
CRACKLOCK E400L sizes and key figures
Two-component, 100% solids structural injection epoxy for hairline and fine cracks in concrete and masonry, by pressure injection or gravity feed. Its low viscosity draws it deep into the crack.
- Crack width
- 0.05–3 mmhairline and fine cracks · TDS p2
- Viscosity
- 100–500 cpstypicalat 25°C · TDS p2
- Mix ratio
- 3 : 1Part A to Part B, by volume · TDS p2
- Pack
- 400 mLdual cartridge · TDS p2
- Gel time
- 30–40 mintypicalat 25°C, before it tack-frees · TDS p2
- Grind or coat
- 24 htypicalalso return to full traffic after 24 hours · TDS p5
- Full cure
- 7 daystypicalat 24°C · TDS p2
- Compressive
- 80.5 MPatypicalASTM D695-15 · TDS p2
- Per cartridge
- ≈ 13.3 mtypicalof 2 × 15 mm crack; about 40 m at 1 × 10 mm · TDS p3
From the FORSPEC data sheet, TDS-CRACKLOCKE400L · Revision 1 · 25 August 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.
CRACKLOCK E400L on site
More FORSPEC jobs
Where CRACKLOCK E400L is used
Use it for
- Crack repair by pressure injection or gravity feed, 0.05 to 3 mm wide
- Port injection of fine vertical cracks
- Deep penetration into fine cracks and voids
- Epoxy mortar patching as a binder with aggregate
- Interior surface overlays when combined with aggregate
- Industrial and commercial repairs: warehouses, bridges, tunnels
Know before you start
- Not a waterproofing membrane. No drinking-water claim is made
- Not for cracks over 3 mm: use CRACK PRO 1200PS, or PROBOND 1100 for 3–20 mm
- Not for damp, wet or frosted substrates, or new concrete under 28 days old
- Do not apply below +5°C or above +35°C; surface overlays are interior only
Its FORSPEC systems
How to apply CRACKLOCK E400L
- 01
Prepare
Concrete at least 28 days old, clean, sound, completely dry and roughened. Cut a 3 mm wide groove at least 1 mm deep along the crack, wire-brush it and remove all dust.
- 02
Set up
Condition the cartridge to 18–29°C so it keeps its low viscosity. Shake 1 minute, rest 1 minute, purge until both parts flow evenly, then fit the static mixing nozzle.
- 03
Gravity feed
Horizontal cracks: pour or inject into the groove and let it self-level to fill the crack. Repeat until no more is accepted. Remove excess before it goes tack-free.
- 04
Port injection
Vertical cracks: set ports about 450 mm apart from the bottom, cap with PROBOND 1100 and let it cure. Inject port by port upward until resin shows at the port above.
- 05
Mortar
For spall patches mix A and B, then add 4 to 5 parts kiln-dried sand or aggregate by volume. Maximum 70 mm per layer.
- 06
Cure
Grind, coat or return to traffic after 24 hours. Full cure is 7 days. Remove ports mechanically and grind the capping paste flush.
A short guide from the data sheet. Read the full CRACKLOCK E400L TDS before you start.
Learn to install it
Hands-on FORSPEC training that covers CRACKLOCK E400L.
Drawings for the systems it goes in
FORSPEC standard details as PDF and DXF. Each sheet is a generic detail: the specification names the products.
CRACKLOCK E400L questions
What crack widths is CRACKLOCK E400L for?
Hairline and fine cracks from 0.05 mm to 3 mm. For wider cracks use CRACK PRO 1200PS, or PROBOND 1100 for 3 to 20 mm.
How much CRACKLOCK E400L do I need?
A 2 × 15 mm crack takes about 30 mL per metre, so a 400 mL cartridge covers about 13.3 m. A 1 × 10 mm crack takes about 10 mL per metre, about 40 m per cartridge (typical figures).
Can I inject a damp crack?
No. The crack and the surrounding environment must be completely dry, and new concrete must be at least 28 days old.
How long before I can grind or coat?
24 hours for grinding, coating with paint or architectural coatings, and return to full traffic. Full cure is 7 days (typical values).
Does temperature matter?
Yes. Never apply below +5°C or above +35°C. Condition the product to 18–29°C before use, because cold product thickens and loses the low viscosity it depends on.
Is it a waterproofing membrane?
No. It restores structural continuity inside the crack. No drinking-water claim is made, so do not specify it for contact with drinking water.
Used with CRACKLOCK E400L
CRACKLOCK E400L TDS and SDS
Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for CRACKLOCK E400L.