The initial tack of adhesives and sealants refers to the ability of the adhesive or sealant to bond to a substrate upon contact, before any significant curing or setting occurs. This property is crucial in many applications, as it determines how well the adhesive will hold materials together immediately after application.
Here are some key points regarding initial tack:
Importance of Initial Tack
Immediate Bonding: High initial tack allows for immediate adhesion, which is essential in applications where parts need to be held in place during assembly or curing.
Handling and Positioning: Good initial tack helps in positioning components accurately without the risk of them slipping or moving before the adhesive fully cures.
Time Efficiency: Products with high initial tack can reduce assembly time, as they require less clamping or support during the curing process.
Factors Affecting Initial Tack
Viscosity: The viscosity of the super bonding adhesive or sealant can influence its ability to wet the surfaces and create an initial bond. Lower viscosity materials often have better initial tack.
Surface Energy: The surface energy of the substrates being bonded plays a significant role. High-energy surfaces (like metals) typically allow for better adhesion than low-energy surfaces (like plastics).
Temperature and Humidity: Environmental conditions can affect the performance of adhesives. Higher temperatures may enhance tack, while humidity can either help or hinder adhesion depending on the adhesive chemistry.
Curing Mechanism: The type of curing mechanism (e.g., moisture-curing, heat-curing, UV-curing) can influence initial tack. Some adhesives may require a certain level of moisture or heat to develop tack.
Testing Initial Tack
Peel Test: A common method to evaluate initial tack is the peel test, where a strip of adhesive is bonded to a substrate and then pulled away to measure the force required to separate them.
Shear Test: This Strong Bonding Sealant test measures the adhesive’s ability to resist sliding forces when two substrates are bonded together.
Tack Test: Specific tack testing methods, such as the “finger test,” can be used to assess how well an adhesive sticks to a surface immediately after application.
Applications
Construction: Adhesives with high initial tack are often used in construction for bonding panels, tiles, and other materials where immediate hold is necessary.
Automotive: In automotive applications, adhesives are used for bonding components that need to be positioned accurately during assembly.
Packaging: In packaging, initial tack is critical for ensuring that seals hold during transport and storage.
The Best Adhesive For Natural Stone
Junbond Fix All High Tack Super Strong Bonding Sealant is Super strong sealant and adhesive with high initial tack and end strength (400kg/10cm²). Can be used to seal a variety of joints and bond materials to achieve high-performance flexible bonding and sealing on virtually any porous and non-porous surface.The product contains antifungal agents that effectively prevent mold growth.
|
No |
Test Item |
Unit | Actual results | |
|
1 |
Appearance | - | Smooth, no air bubbles, no lumps | |
|
2 |
Tack free time(at 23℃ 50% humidity) | min |
22-25 |
|
|
3 |
Slump | Vertical | mm |
0 |
| Horizontal | mm |
Not deformed |
||
|
4 |
Extrusion | ml/min |
≥1000 |
|
|
5 |
Shore A hardness /72h | - |
54±2 |
|
|
6 |
Shear Strength | Mpa |
≥1.9±5 |
|
|
7 |
Tensile strength | Mpa |
≥2.3±5 |
|
|
8 |
Elongation at break | % |
310 |
|
|
9 |
volatile organic compound(VOC) without formaldehyde toluene |
≤0.03 |
||
|
10 |
Specific gravity | g/cm3 |
1.45±0.05 |
|
|
11 |
Completely dry (8mm sealant tape) | hours |
21 |
|
|
12 |
Temperature Resistance | °C |
-50℃~150℃ |
|
|
13 |
Application Temperature | °C |
4℃~40℃ |
|
|
14 |
Color |
White/Black |
||
|
No |
Test Item |
Unit | Actual results | |
|
1 |
Appearance | - | Smooth, no air bubbles, no lumps | |
|
2 |
Tack free time(at 23℃ 50% humidity) | min |
5-8 |
|
|
3 |
Slump | Vertical | mm |
0 |
| Horizontal | mm |
Not deformed |
||
|
4 |
Extrusion | ml/min |
≥300 |
|
|
5 |
Shore A hardness /72h | - |
20-25A |
|
|
6 |
Shear Strength | Mpa |
≥2.0±5 |
|
|
7 |
Tensile strength | Mpa |
≥1±5 |
|
|
8 |
Elongation at break | % |
≥150 |
|
|
9 |
volatile organic compound(VOC) without formaldehyde toluene |
≤0.03 |
||
|
10 |
Specific gravity | g/cm3 |
1.1±0.05 |
|
|
11 |
Completely dry (8mm sealant tape) | hours |
17 |
|
|
12 |
Temperature Resistance | °C |
-50℃~150℃ |
|
|
13 |
Application Temperature | °C |
4℃~40℃ |
|
|
14 |
Color |
Crystal clear |
||