IN STOCK
Pu Star
Struct - EP870 Chemical Anchor Resin 360ml
Some fixings just need to hold. A shelf bracket can get away with a plug and a screw. Rebar dowelled into an existing slab for a building extension, a structural steel base plate, or an anchor rod carrying real load cannot — those need a bond engineered to perform under sustained structural load, not just resist a tug test.
That's what Lejell®Struct-EP870 is built for. It's a two-component, modified epoxy-based rebar bonding adhesive manufactured by PU Star, engineered to anchor rebar and rods into concrete, masonry and rock with a bond strength comparable to cast-in rebar. It complies with the Type A standard requirements of GB 50728 — the Chinese national standard governing post-installed rebar anchoring in structural concrete.
At KSh 1,000 inclusive of VAT per 360mL set, it's a small line item against the cost of a structural fixing done wrong.
What Makes This Different From a Mechanical Anchor
A mechanical anchor — a standard expansion bolt — holds by physically wedging against the sides of a drilled hole. That works in solid, uncracked concrete, but it puts localised stress on the surrounding material and can loosen under vibration or fail in cracked or lower-strength concrete.
EP870 works differently. It's injected into a properly prepared hole, and rebar or a threaded rod is set into the resin before it cures. As the two-component epoxy hardens, it forms a continuous adhesive bond along the full embedment length, with no expansion stress on the surrounding concrete — the manufacturer's data shows anchoring strength comparable to cast-in rebar, not just a mechanically wedged fixing.
The result is rapid, efficient setting and a bond that performs reliably in retrofit and renovation work where the substrate is existing, not freshly poured, concrete.
Where EP870 Gets Used
Rebar anchoring for building additions — dowelling new rebar into existing concrete, walls or rock when extending a structure or adding a floor.
Structural reinforcement and renovation — retrofit projects where new reinforcement needs a genuinely structural bond into old concrete, not a surface-level fix.
Curtain wall installation — anchoring fixings for façade and curtain wall systems into the structural frame.
Elevator shaft installation — structural anchor points for elevator guide rails and associated equipment.
Equipment installation — mounting machinery and equipment that requires a reliable structural fixing into concrete or masonry.
How It's Applied
Getting the result the data sheet promises depends on following the sequence correctly, not just injecting the resin:
- Drilling — mark locations and depths per the construction drawings, then drill the holes.
- Hole cleaning — thoroughly remove all debris and dust using a wire brush and air blower. A dusty hole is the single most common cause of a weak bond, regardless of resin quality.
- Injection — fit the cartridge with the spiral mixing nozzle into the dispensing gun, insert the nozzle to the bottom of the hole, and inject while steadily withdrawing the gun so the hole fills from the bottom up without trapping air. Discard the first 20g dispensed after fitting a new nozzle before injecting into the hole, to ensure only fully mixed adhesive is used.
- Anchoring and rod installation — slowly rotate the rebar or anchor rod into the filled hole. Do not disturb it before the adhesive has cured.
- Curing — allow full curing time before loading, which varies with ambient temperature.
- Loading — only once fully cured can the anchorage be loaded and subsequent construction proceed.
Winter/cold-weather note: the manufacturer recommends a construction environment between 5°C and 35°C. In cold conditions, the cartridge can be preheated in warm water (approximately 40°C) or a heated room for 30 minutes before use.
Reusing a partial cartridge: tighten the cap securely to preserve unused adhesive, and fit a new nozzle before the next use.
Technical Specifications
Spec Value
Product Type | Two-component, modified epoxy rebar bonding adhesive
Standard Compliance | GB 50728, Type A requirements (Chinese national standard for post-installed rebar)
Mixing Ratio (Volume) | A : B = 5 : 1
Appearance | Component A: white; Component B: red; mixed: red
Density | 1.70 g/cm³
Operating Time | 45 ± 10 minutes
Application Time | ≥10 minutes (typical 15 minutes)
Sagging | ≤2mm (typical: 0mm — non-sag formulation)
Hardness (Shore D) | ≥60 (typical 80)
Compressive Strength | ≥60 MPa (typical 90 MPa)
Flexural Strength | ≥50 MPa (typical 85 MPa)
Splitting Tensile Strength | ≥8.5 MPa (typical 15 MPa)
Steel-to-Steel Tensile Shear Strength | ≥10 MPa (typical 22 MPa)
Bond Strength to Concrete (C30, confined pull-out, ribbed bar) | ≥17.0 MPa (typical 22 MPa)
Solid Content | ≥99% (typical 99.5%)
Packaging | 360mL per set, 30 sets per carton
Shelf Life | 12 months
Storage | 15–25°C, humidity ≤50% RH, sealed, out of direct sun
Recommended Application Temperature | 5°C to 35°C
Price | KSh 1,000 per 360mL set (inclusive of VAT)
Availability | In stock
Note: all figures above are the manufacturer's typical values tested at 23±2°C, 50±5% RH — actual performance will vary with ambient temperature and humidity on site.
Who Needs This Product?
Structural contractors and steel fixers dowelling rebar into existing concrete for extensions, additional floors, or reinforcement work. Engineers and site supervisors specifying post-installed rebar anchoring on renovation and retrofit projects. Façade and curtain wall installers anchoring fixings into the structural frame. Elevator installation teams setting structural anchor points for guide rails and equipment. Fabricators and maintenance teams mounting machinery that needs a genuinely structural fixing rather than a mechanical anchor.
If the fixing is decorative or lightly loaded, a standard wall plug or mechanical anchor is usually sufficient and considerably cheaper. EP870 earns its place specifically for rebar anchoring and structural fixings where the manufacturer's Type A GB 50728 compliance and cast-in-comparable strength actually matter.
Safety on Site
Personnel must wear gloves, masks, safety goggles and hard hats during application. If the product contacts skin or clothing, clean with acetone followed by thorough washing with water. If it contacts the eyes, hold eyelids apart and flush thoroughly with water, and seek medical attention immediately. Keep the product away from children, and store sealed in a cool, dry place away from direct sunlight and heat sources — never squeeze or drop cartridges during transport.
Why Buy From Startcore?
A structural fixing is only as reliable as the resin behind it and the person applying it correctly. Startcore stocks Lejell Struct-EP870 alongside the rest of the construction chemicals range — waterproofing systems, admixtures, adhesives and sealants — so structural anchoring products, general construction chemicals, and the applicator tools needed to install them properly can all come from one supplier.
The manufacturer recommends a compatibility test or consultation with their technical services before full-scale application on projects with unusual substrates or conditions — our team can help point you toward that guidance if your project calls for it.
Pricing & Availability
Price: KSh 1,000 per 360mL set (inclusive of VAT) — no hidden charges.
Stock status: In stock and ready for dispatch, with same-day or next-day delivery in Nairobi depending on order time, and courier or dedicated transport arranged for sites outside Nairobi.
Frequently Asked Questions
What standard does EP870 comply with? It meets the Type A requirements of GB 50728, the Chinese national standard for post-installed rebar anchoring adhesives, with anchoring strength described by the manufacturer as comparable to cast-in rebar.
What's the working time once mixed? The operating time is 45±10 minutes, with an application time of at least 10 minutes (typically 15) before the resin sets — plan your injection and rod installation within this window.
How long does it take to fully cure? Cure time depends on ambient temperature. Do not disturb the rebar or rod before the adhesive has fully cured, and don't apply any load until curing is complete.
Can this be used in cold weather? The manufacturer recommends a construction environment between 5°C and 35°C. In cold conditions, preheat the cartridge in warm water (around 40°C) or a heated room for 30 minutes before use.
What tools do I need to apply it? A standard dispensing gun compatible with the spiral mixing nozzle, plus a wire brush and air blower to clean drilled holes of dust before injection.
Do you deliver outside Nairobi? Yes — construction chemicals, tools, PPE and automotive supplies are delivered across Kenya and East Africa.
Some fixings just need to hold. A shelf bracket can get away with a plug and a screw. Rebar dowelled into an existing slab for a building extension, a structural steel base plate, or an anchor rod carrying real load cannot — those need a bond engineered to perform under sustained structural load, not just resist a tug test.
That's what Lejell®Struct-EP870 is built for. It's a two-component, modified epoxy-based rebar bonding adhesive manufactured by PU Star, engineered to anchor rebar and rods into concrete, masonry and rock with a bond strength comparable to cast-in rebar. It complies with the Type A standard requirements of GB 50728 — the Chinese national standard governing post-installed rebar anchoring in structural concrete.
At KSh 1,000 inclusive of VAT per 360mL set, it's a small line item against the cost of a structural fixing done wrong.
What Makes This Different From a Mechanical Anchor
A mechanical anchor — a standard expansion bolt — holds by physically wedging against the sides of a drilled hole. That works in solid, uncracked concrete, but it puts localised stress on the surrounding material and can loosen under vibration or fail in cracked or lower-strength concrete.
EP870 works differently. It's injected into a properly prepared hole, and rebar or a threaded rod is set into the resin before it cures. As the two-component epoxy hardens, it forms a continuous adhesive bond along the full embedment length, with no expansion stress on the surrounding concrete — the manufacturer's data shows anchoring strength comparable to cast-in rebar, not just a mechanically wedged fixing.
The result is rapid, efficient setting and a bond that performs reliably in retrofit and renovation work where the substrate is existing, not freshly poured, concrete.
Where EP870 Gets Used
Rebar anchoring for building additions — dowelling new rebar into existing concrete, walls or rock when extending a structure or adding a floor.
Structural reinforcement and renovation — retrofit projects where new reinforcement needs a genuinely structural bond into old concrete, not a surface-level fix.
Curtain wall installation — anchoring fixings for façade and curtain wall systems into the structural frame.
Elevator shaft installation — structural anchor points for elevator guide rails and associated equipment.
Equipment installation — mounting machinery and equipment that requires a reliable structural fixing into concrete or masonry.
How It's Applied
Getting the result the data sheet promises depends on following the sequence correctly, not just injecting the resin:
- Drilling — mark locations and depths per the construction drawings, then drill the holes.
- Hole cleaning — thoroughly remove all debris and dust using a wire brush and air blower. A dusty hole is the single most common cause of a weak bond, regardless of resin quality.
- Injection — fit the cartridge with the spiral mixing nozzle into the dispensing gun, insert the nozzle to the bottom of the hole, and inject while steadily withdrawing the gun so the hole fills from the bottom up without trapping air. Discard the first 20g dispensed after fitting a new nozzle before injecting into the hole, to ensure only fully mixed adhesive is used.
- Anchoring and rod installation — slowly rotate the rebar or anchor rod into the filled hole. Do not disturb it before the adhesive has cured.
- Curing — allow full curing time before loading, which varies with ambient temperature.
- Loading — only once fully cured can the anchorage be loaded and subsequent construction proceed.
Winter/cold-weather note: the manufacturer recommends a construction environment between 5°C and 35°C. In cold conditions, the cartridge can be preheated in warm water (approximately 40°C) or a heated room for 30 minutes before use.
Reusing a partial cartridge: tighten the cap securely to preserve unused adhesive, and fit a new nozzle before the next use.
Technical Specifications
Spec Value
Product Type | Two-component, modified epoxy rebar bonding adhesive
Standard Compliance | GB 50728, Type A requirements (Chinese national standard for post-installed rebar)
Mixing Ratio (Volume) | A : B = 5 : 1
Appearance | Component A: white; Component B: red; mixed: red
Density | 1.70 g/cm³
Operating Time | 45 ± 10 minutes
Application Time | ≥10 minutes (typical 15 minutes)
Sagging | ≤2mm (typical: 0mm — non-sag formulation)
Hardness (Shore D) | ≥60 (typical 80)
Compressive Strength | ≥60 MPa (typical 90 MPa)
Flexural Strength | ≥50 MPa (typical 85 MPa)
Splitting Tensile Strength | ≥8.5 MPa (typical 15 MPa)
Steel-to-Steel Tensile Shear Strength | ≥10 MPa (typical 22 MPa)
Bond Strength to Concrete (C30, confined pull-out, ribbed bar) | ≥17.0 MPa (typical 22 MPa)
Solid Content | ≥99% (typical 99.5%)
Packaging | 360mL per set, 30 sets per carton
Shelf Life | 12 months
Storage | 15–25°C, humidity ≤50% RH, sealed, out of direct sun
Recommended Application Temperature | 5°C to 35°C
Price | KSh 1,000 per 360mL set (inclusive of VAT)
Availability | In stock
Note: all figures above are the manufacturer's typical values tested at 23±2°C, 50±5% RH — actual performance will vary with ambient temperature and humidity on site.
Who Needs This Product?
Structural contractors and steel fixers dowelling rebar into existing concrete for extensions, additional floors, or reinforcement work. Engineers and site supervisors specifying post-installed rebar anchoring on renovation and retrofit projects. Façade and curtain wall installers anchoring fixings into the structural frame. Elevator installation teams setting structural anchor points for guide rails and equipment. Fabricators and maintenance teams mounting machinery that needs a genuinely structural fixing rather than a mechanical anchor.
If the fixing is decorative or lightly loaded, a standard wall plug or mechanical anchor is usually sufficient and considerably cheaper. EP870 earns its place specifically for rebar anchoring and structural fixings where the manufacturer's Type A GB 50728 compliance and cast-in-comparable strength actually matter.
Safety on Site
Personnel must wear gloves, masks, safety goggles and hard hats during application. If the product contacts skin or clothing, clean with acetone followed by thorough washing with water. If it contacts the eyes, hold eyelids apart and flush thoroughly with water, and seek medical attention immediately. Keep the product away from children, and store sealed in a cool, dry place away from direct sunlight and heat sources — never squeeze or drop cartridges during transport.
Why Buy From Startcore?
A structural fixing is only as reliable as the resin behind it and the person applying it correctly. Startcore stocks Lejell Struct-EP870 alongside the rest of the construction chemicals range — waterproofing systems, admixtures, adhesives and sealants — so structural anchoring products, general construction chemicals, and the applicator tools needed to install them properly can all come from one supplier.
The manufacturer recommends a compatibility test or consultation with their technical services before full-scale application on projects with unusual substrates or conditions — our team can help point you toward that guidance if your project calls for it.
Pricing & Availability
Price: KSh 1,000 per 360mL set (inclusive of VAT) — no hidden charges.
Stock status: In stock and ready for dispatch, with same-day or next-day delivery in Nairobi depending on order time, and courier or dedicated transport arranged for sites outside Nairobi.
Frequently Asked Questions
What standard does EP870 comply with? It meets the Type A requirements of GB 50728, the Chinese national standard for post-installed rebar anchoring adhesives, with anchoring strength described by the manufacturer as comparable to cast-in rebar.
What's the working time once mixed? The operating time is 45±10 minutes, with an application time of at least 10 minutes (typically 15) before the resin sets — plan your injection and rod installation within this window.
How long does it take to fully cure? Cure time depends on ambient temperature. Do not disturb the rebar or rod before the adhesive has fully cured, and don't apply any load until curing is complete.
Can this be used in cold weather? The manufacturer recommends a construction environment between 5°C and 35°C. In cold conditions, preheat the cartridge in warm water (around 40°C) or a heated room for 30 minutes before use.
What tools do I need to apply it? A standard dispensing gun compatible with the spiral mixing nozzle, plus a wire brush and air blower to clean drilled holes of dust before injection.
Do you deliver outside Nairobi? Yes — construction chemicals, tools, PPE and automotive supplies are delivered across Kenya and East Africa.
