Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Product Overview
- STP 1921 is a good compromise between an adhesive and a sealant based on Silane-terminated Polymer. STP 1921 is suitable for elastic seal which also high strength is required.
- STP 1921 is odourless and free of solvents, isocyanates, silicones and PVC. It demonstrates good adhesion without primer to many substrates and is compatible with suitable paint systems. The sealant also demonstrates good UV resistance and therefore can be used for interior and exterior applications.
- Features & Benefits
- STP 1921 is a good compromise between an adhesive and a sealant based on Silane-terminated Polymer. STP 1921 is suitable for elastic seal which also high strength is required.
- STP 1921 is odorless and free of solvents, isocyanates, silicones and PVC. It demonstrates good adhesion without primer to many substrates and is compatible with suitable paint systems. The sealant also demonstrates good UV resistance and therefore can be used for interior and exterior applications.
Applications & Uses
- Markets
- Applications
- Application Area
- Cure Method
- Applications
- Elastic bonding of metals and plastics.
- Elastic, interior and/or exterior seam and joint sealing.
- In the following areas: vehicle body, caravan, railway carriage, container, general metal and apparatus construction; the electrical, plastics, air-conditioning and ventilation industries.
- Application Instructions
- The substrates must be clean, dry, free of oil and grease.
- Sausage is applied with the corresponding Hand or Air pressure pistols. In the case of compressed air application, a pressure of (0.2-0.4) MPa is required.
- After application, STP1921 can be smoothed with soapy water.
- Application Limitations
When bonding and sealing PMMA and polycarbonate, under tension, stress corrosion cracking may occur. In such cases STP 1921 should not be utilized.
Properties
- Physical Form
- Typical Properties
- Thermal Properties
- Cured Properties
- Rheological Properties
| Value | Units | Test Method / Conditions | |
| Specific Gravity | approx. 1.45 | - | - |
| Value | Units | Test Method / Conditions | |
| Application Temperature | 5 - 40 | °C | - |
| Operating Temperature | - 50 - 90 | °C | - |
| Short Exposure | 120.0 | °C | - |
| Value | Units | Test Method / Conditions | |
| Skin Formation Time (21 - 25°C, 45 - 55% relative humidity) | approx. 30 | min | - |
| Cure Rate (21 - 25°C, 45 - 55% relative humidity) | approx. 3 | mm/24h | - |
| Hardness | approx. 35 | - | ISO7619, GB/T531, Shore A |
| Tensile Strength | approx. 1.8 | MPa | ISO37, GB/T528 |
| Elongation at Break | approx. 350 | % | ISO37, GB/T528 |
| Value | Units | Test Method / Conditions | |
| Sag Resistance | No sagging | - | - |
Technical Details & Test Data
- Technical Details
- Adhesion - STP 1921 has been tested and found to have excellent adhesion to the following unprimed substrates: aluminum, acrylic-coated aluminum, brass, steel, stainless steel, glass, fiberglass, ABS, rigid PVC, polyester and etc. Depending on the surface it can be necessary to roughen the surface or to use a primer as an adhesion promoter to provide optimum adhesion.
- Paintability - STP1921 may be over-painted, however due to the large number of paints and varnishes we strongly recommend a compatibility test before application. The drying time of alkyd resin based paints may increase.
Packaging & Availability
- Packaging Type
- Typical Packaging
- Cartridge 310ml
- Sausage 400ml, 600ml
Storage & Handling
- Shelf Life
- 12 Months
- Storage Conditions
Recommended storage temperature: 8°C - 28°C