STP ShaliSeal EMS
A two-component semi-rigid epoxy that fills saw-cut control and construction joints in industrial floors, supporting the edges against forklift and hard-wheel traffic.
What is it?
A two-component, semi-rigid epoxy joint filler (polysulphide-modified epoxy) for control and construction joints in industrial concrete floors. Formerly sold as ShaliEMS 700.
Where is it used?
Saw-cut and formed floor joints in warehouses, factories, cold stores and logistics centres carrying forklift and hard-wheel traffic; also as a crack repair for older floors.
Why use it?
It fills the joint full-depth and shoulders the arris, so slab edges stop spalling under point loads. A Shore A 80-90 semi-rigid set moves just enough with the slab without going soft.
How is it applied?
Mix Comp A and Comp B, pour the self-levelling material into a clean, dry groove, overfill, then razor-cut or grind flush. Cures within 24 hours at 25 degrees C.
About STP ShaliSeal EMS
On a busy industrial floor, the weak point is almost never the middle of the slab. It is the joint. Every saw-cut and construction joint leaves two unsupported concrete arrises, and once a loaded forklift or a hard polyurethane wheel drops across an open gap, those edges begin to chip, ravel and eventually spall. STP ShaliSeal EMS exists to close that gap. It is a two-component, semi-rigid epoxy filler that you pour into the joint so the material carries the wheel across the opening and transfers the load into the slab instead of into the fragile edge.
The chemistry here is deliberate. ShaliSeal EMS is a polysulphide-modified epoxy, which means it sets hard enough to resist abrasion and support the arris (Shore A 80-90 at seven days), yet retains a controlled degree of give so it can absorb the small thermal and drying movement a floor slab makes over its life. That is why STP designs it around the ACI 302 recommendation for epoxy joint fillers rather than as a flexible caulk. It is a load-transfer product, not an expansion-joint sealant, and getting that distinction right is the single most important thing an applicator on site needs to understand.
The technical insight
The performance comes down to how the filler shares load. A joint left open behaves like a cantilevered slab edge, so a wheel crossing it concentrates stress on a thin lip of unconfined concrete and chips it away. Filling the joint full-depth with a rigid-enough material lets the wheel roll continuously and spreads the contact pressure back into the body of the slab. If the filler were a soft, flexible sealant it would simply compress and let the edge take the punishment anyway; if it were fully rigid it would debond or crack the first time the slab shrank. The polysulphide modification is what balances these. It raises the epoxy’s ductility so the set filler tolerates 60-80 percent elongation and small joint movement, while a compressive strength of 18-22 MPa and low water absorption (0.6-1.0 percent) keep the shoulder firm and chemically durable under CaCl2, caustic and dilute acid contact. This is also why STP insists the floor be 3-6 months old before filling: most drying shrinkage should already have happened, so the joint has stopped narrowing and the cured filler will not be torn.
Where it is used
- Filling saw-cut control (contraction) joints in industrial concrete floors
- Sealing construction (day-work) joints in warehouse and factory slabs
- Semi-rigid joint fill under forklift, pallet-truck and hard-wheel traffic
- Cold store, distribution centre and logistics floor joints
- Crack repair in older concrete floors to slow further deterioration
- Joint filling in production areas exposed to dilute chemical spillage
- Heavy-duty flooring in car parks and manufacturing plants where joint edges must be protected
Key advantages
- Semi-rigid set (Shore A 80-90) supports and protects the joint arris against spalling under wheel loads
- Self-levelling once mixed, so it pours straight into horizontal joints and forms a tough seal without tooling
- Semi-flexible formula tolerates the limited thermal and humidity movement of the slab
- Good chemical resistance to dilute calcium chloride, caustic and muriatic acid, suited to industrial spillage
- Cures within 24 hours at 25 degrees C, returning the joint to traffic quickly
- Reduces long-term joint repair and floor maintenance costs
- Designed to the ACI 302 recommendation for epoxy floor-joint fillers
- Doubles as a crack-repair filler for ageing floors
Limitations & considerations
- Not an expansion-joint sealant, and must never be used to fill isolation or movement joints
- Not UV stable, so it is for interior floors, not exposed external joints
- Not recommended for vertical joints; it is a self-levelling, pour-in product for horizontal joints only
- Should be applied 3 to 6 months after the floor is cast so most drying shrinkage is complete
- Requires application above 4 degrees C, with a short pot life of 14 to 18 minutes that demands quick, well-organised placement
- Shelf life is only 6 months, so stock should be rotated and used fresh
Selection & best practice
Wait until the slab is 3 to 6 months old before filling joints, so drying shrinkage has largely finished. Clean the groove thoroughly, removing all oil, grease, paint, dust and loose particles by air pressure or a suitable method; the surface must be clean and dry. Run masking tape along both joint edges for a neat, straight finish. Stir each component with a hand stirrer to break up any settlement, then a power stirrer, and add Component B gradually into Component A under continuous mixing until fully homogeneous. Work to the 14-18 minute pot life, so mix only what the crew can place in that window. Pour the mixed material into the groove, overfill it, and immediately strike off with a razor knife or grind flush with the floor; if it has fully hardened, a heat flame softens it for trimming. No special curing is needed. Keep the floor above 4 degrees C, and clean tools with STP Thinner before the material hardens.
Specifications
| Composition | Two-component, semi-rigid polysulphide-modified epoxy sealant |
| Pot life @ 27 C, 55% RH | 14 – 18 minutes |
| Mixed density | 1.30 – 1.50 g/cc |
| Compressive strength @ 72 hrs (ASTM C579) | 18 – 22 MPa |
| Tensile strength @ 7 days (ASTM D638) | 4 – 6 MPa |
| Elongation @ 7 days (ASTM D638) | 60 – 80 % |
| Shore A hardness @ 7 days (ASTM D2240) | 80 – 90 |
| Water absorption (ASTM D570) | 0.6 – 1.0 % |
| Tack-free time | 8 – 10 hrs; full cure within 24 hrs @ 25 C |
| Coverage | Running metres per kg = 714.3 / (W x D), W and D in mm |
| Packaging / shelf life | 2.5 kg unit (resin + hardener) in 15 kg carton; 6 months sealed |
Industry use cases
Warehousing & Logistics
Protects saw-cut joints across high-throughput aisles where reach trucks and pallet movers run continuously, cutting joint-edge spalling and unplanned floor downtime.
Cold Storage
Fills floor joints in chilled and frozen stores so hard wheels do not ravel the arrises; apply above 4 degrees C and let joints reach a stable width before filling.
Manufacturing & Heavy Industry
Provides a firm, abrasion-resistant joint fill on production floors exposed to point loads and dilute chemical spillage such as calcium chloride, caustic and acid.
Automotive & Distribution
Keeps control and construction joints level and load-sharing in car parks and dispatch bays, reducing the shock and rework of open joints under constant wheel traffic.
Floor Refurbishment
Repairs cracks and re-fills degraded joints in ageing concrete floors, slowing further deterioration without replacing the slab.
Frequently asked questions
Is ShaliSeal EMS the same as ShaliEMS 700?
Can I use ShaliSeal EMS in an expansion joint?
How long after casting the floor should I fill the joints?
How much material do I need per metre of joint?
How soon can the floor take traffic after filling?
Can ShaliSeal EMS be used on outdoor or vertical joints?
How we position STP ShaliSeal EMS
ShaliSeal EMS is STP’s dedicated semi-rigid epoxy joint filler for industrial floors, and it should be specified for that job specifically, not as a general sealant. Where the joint is a genuine movement or expansion joint rather than a control or construction joint, pair it with a flexible sealant instead: within the STP ShaliSeal family, ShaliSeal PS PG/GG (polysulphide) or ShaliSeal PU PG/GG (polyurethane) suit those moving joints, and ShaliSeal BT SB serves cold-applied bituminous joints. On a full floor package, ShaliSeal EMS follows the flooring system itself, so it complements STP ShaliFloor screeds and self-levelling toppings once the slab has matured. Across our other brands, we can also supply equivalent-duty epoxy joint fillers and matching expansion-joint sealants from Fosroc, Sika and MC-Bauchemie where a project specification calls for a named alternative; talk to our Space Arc technical team and we will match the joint type, movement class and traffic to the right product.
Related Sealants & Joint Treatment products
Source STP ShaliSeal EMS for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.