Merbenit ST40
Sprayable 1K-SMP adhesive/sealant for large-area bonding and seam sealing.
Sprayable 1K SMP adhesive/sealant for large-area bonding and seam sealing — Plastisol appearance, long working time (25 min), Shore A 35
Documents
Internal reference:
92-ST40.KT.ML290.GR
HS code:
3214.1000
Merbenit ST40 is a sprayable 1K-SMP adhesive/sealant for large-area bonding and seam sealing — Plastisol appearance, long working time (25 min), Shore A 35.
Silane-modified polymers (SMPs) are modern, high-performance adhesives—moisture-curing, solvent-, isocyanate-, and silicone-free, with a very broad adhesion spectrum to metals, painted and galvanized surfaces, engineering plastics, glass, ceramics, concrete, stone, and wood. They are paintable, corrosion-resistant, shock- and vibration-resistant, and low-odor. ST40 is a specific variant of the Merbenit SMP series—its key properties and applications are described below.
Merbenit ST40 is designed for large-area applications — sprayable, with a long working time (25 min) for complex seam sealing. The finished seam seals are visually identical to classic plastisol seams — ideal as a replacement for plastisol in automotive manufacturing.
What makes ST40 stand out
What is ST40 used for?
processing
Recommended accessories
ST40 compared to related Merbenit products
Direct comparison of mechanical and processing values — all data from the official Merbenit TDS.
ST40 Current product |
HM21 → | HT50 → | TMS32 → | |
|---|---|---|---|---|
| Networking system | 1K moisture-curing | 1K moisture-curing | 1K moisture-curing | 1K moisture-curing |
| consistency | pasty, sprinkable | stable, ≤3 mm | stable | stable, ≤3 mm |
| Shore A hardness | A 35 | A 45 | A 45 | A 34 |
| Tensile strength | 2.0 N/mm² | 2.5 N/mm² | 2.5 N/mm² | 1.6 N/mm² |
| Elongation at break | 250 % | 350 % | 200 % | 500 % |
| Module 100% | 1.1 N/mm² | 1.6 N/mm² | 1.5 N/mm² | 0.8 N/mm² |
| Processing time | 25 min | 30 min | 10 min | 30 min |
| Curing time: 24 hours | 2.0 mm | ≥3.0 mm | 2.5 mm | ≥2.0 mm |
| Curing time: 48 hours | 3.0 mm | ≥4.0 mm | 4.0 mm | ≥3.5 mm |
| density | 1.38 | 1.52 | 1.48 | 1.48 |
| Temperature range | -40 / +90 °C | -40 / +90 °C | -40 / +90 °C | -40 / +90 °C |
| Change in volume | ≤6 % | ≤5 % | ≤4 % | ≤3 % |
| Main application | Automotive seam sealants | Metal construction | Instant adhesives | Natural stone grouting |
Technical data for Merbenit ST40
| Product information | |
|---|---|
| Tensile strength | approx. 2.0 N/mm² |
| Temperature range (°C) | -40 °C to +90 °C |
| Container | 290ml cartridge |
| consistency | Paste-like, sprinkable |
| Performance at final strength | |
|---|---|
| Elongation at break | approximately 250% |
| Physical properties | |
|---|---|
| density | 1.38 g/cm³ |
| Hardness (Shore A) | approximately 35 |
| Chemical group | Silane-modified polymer |
| Color | gray |
| Cured layer thickness after 24 hours | approx. 2.0 mm |
| curing technique | Moisture-curing |
| Generally | |
|---|---|
| Processing temperature | +5 °C to +40 °C |
| Tension at 100% elongation | approx. 1.1 N/mm² |
| Change in volume | ≤ 6% |
| Number of components | 1K |
For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.
Frequently asked questions about ST40
Practical application and design questions — answered by SILITECH.
Merbenit ST40: Sprayable 1K SMP adhesive/sealant for large-area bonding and seam sealing — Plastisol appearance, long working time (25 min), Shore A 35. Main applications: Automotive seam sealing, weld seam protection, large-area bonding.
SMP = Silane-modified polymer. This modern class of adhesives combines the advantages of silicone (elasticity, weather resistance, broad adhesion spectrum) and polyurethane (mechanical strength, paintability) — without their disadvantages (silicone: not paintable, corrosion on some metals; PU: isocyanates, often problematic indoors). SMP adhesives are solvent-, isocyanate-, and silicone-free, paintable, corrosion-resistant, and adhere to most substrates without a primer — except PE, PP, PTFE, and silicones.
ST40 adheres to metals (aluminum, stainless steel, steel), powder-coated and painted surfaces, galvanized/anodized/chromated/zinc-coated substrates, many plastics, ceramics, stone, concrete, crepi, wood, and glass. Not suitable for: PP, PE, PTFE (Teflon), silicones, and bitumen substrates. For critical material pairings, we recommend a preliminary test or application with a primer (V40 for smooth, V21 for absorbent substrates).
Store in the unopened original container in a dry, cool place — typically between +5 and +30 °C. Consult the Safety Data Sheet (SDS) before use. Observe the expiry date on the packaging. Use opened cartridges quickly — skin formation in the nozzle will block further application.
In the comparison table above, you will find related Merbenit products with different properties—different hardness, pot life, elongation at break, or special certifications (IMO, EN 45545-2, FMVSS 212, ISEGA, Minergie-ECO). If you are unsure which product is best for you, we would be happy to advise you—contact SILITECH with your specific application (substrate pairing, desired hardness, processing workflow, certification requirements).
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Product specifications
| Product information | |
|---|---|
| Tensile strength | approx. 2.0 N/mm² |
| Temperature range (°C) | -40 °C to +90 °C |
| Container | 290ml cartridge |
| consistency | Paste-like, sprinkable |
| Performance at final strength | |
|---|---|
| Elongation at break | approximately 250% |
| Physical properties | |
|---|---|
| density | 1.38 g/cm³ |
| Hardness (Shore A) | approximately 35 |
| Chemical group | Silane-modified polymer |
| Color | gray |
| Cured layer thickness after 24 hours | approx. 2.0 mm |
| curing technique | Moisture-curing |
| Uncategorized | |
|---|---|
| Processing temperature | +5 °C to +40 °C |
| Tension at 100% elongation | approx. 1.1 N/mm² |
| Change in volume | ≤ 6% |
| Number of components | 1K |
| Keywords | |
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| Keywords | |
Documents and datasheets
Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download: