IOTA CORPORATION LTD
Description
IOTA LSR 3U20 is a two-component UV-curable liquid silicone rubber that forms a gel-like substance after curing. It exhibits excellent yellowing resistance, UV aging resistance, and low shrinkage. It is mainly used for full lamination of touch screens, liquid crystal displays (LCDs), in-vehicle screens, and other similar products.
Typical properties
|
Item |
Test Method |
Value |
|
Before Mixing Part A & Part B |
Before Mixing Part A & Part B |
Before Mixing Part A & Part B |
|
Appearance & Color |
Visual Inspection |
Part A: Colorless transparent liquidPart B: Colorless transparent liquid |
|
Adhesive Viscosity |
ISO3219 |
Part A: 2200 mPa·sPart B: 1000 mPa·s |
|
Mixed Adhesive Viscosity |
ISO3219 |
2200 mPa·s |
|
Adhesive Density |
GB/T4472-2011 |
0.97 g/ml |
|
Before Baking Mixed Part A & Part B |
Before Baking Mixed Part A & Part B |
Before Baking Mixed Part A & Part B |
|
Mixing Ratio |
|
10:1 |
|
Pot Life |
25℃, protected from light |
48 h |
|
Curing Condition |
|
UV-LED (365nm) 3000 mj/cm² + 60℃ / 30 min |
|
After Baking Mixed Part A & Part B |
After Baking Mixed Part A & Part B |
After Baking Mixed Part A & Part B |
|
Appearance |
Visual Inspection |
Colorless transparent gel |
|
Yellowness Index |
ASTM E313-15e1, film thickness 1mm |
<0.1 |
|
Light Transmittance |
UV-Vis spectrophotometer, film thickness 1mm |
99% |
|
Haze |
GB/T 2410-2008, film thickness 1mm |
<0.1% |
|
Penetration |
DIN ISO 2137 |
95 (1/10 mm) |
|
Relative Permittivity |
IEC 60250 |
2.85 |
|
Refractive Index |
n_d 25 |
1.407 |
|
Thermal Conductivity |
GB/T 10297-1998 |
0.2 W/(m·k) |
|
Shrinkage Rate |
GB/T 24148.9-2014 |
<0.1% |
|
Surface Tension |
GB/T 2237-2008 |
24.0 mN·m⁻¹ |
|
G+G Adhesion Force |
Cross tensile force, film thickness 0.5mm |
0.5 MPa |
Surface Treatment
All bonding interfaces must be cleaned. During storage and use, it is essential to ensure no contact with catalyst-toxic substances such as phosphorus (P), sulfur (S), nitrogen (N), organotin (Sn), water, and polyurethane—these substances may cause curing inhibition or product deterioration.
Mixing
Part B contains a catalyst, while Part A is a crosslinking agent. The catalyst can trigger gelation of the component containing the crosslinking agent. Therefore, when using tools like scrapers, special care must be taken to avoid mixing these tools with either component (to prevent cross-contamination).
Curing
The curing time of the liquid silicone rubber is closely related to the curing temperature and the thickness of the adhesive layer. The standard mixing ratio of Part A to Part B is 10:1; deviations from this ratio will have a certain impact on the hardness of the adhesive.
Storage Conditions
This product should be stored in a cool, dry, and well-ventilated environment (15~35℃) in its original packaging. The shelf life is 6 months.
Precautions
Before lamination, test the compatibility of the adhesive with the LCM (Liquid Crystal Module) and TP (Touch Panel).
After lamination and curing according to the normal process, the product should be stored at 25℃ for 7 days before undergoing environmental testing.
Packaging
Part A: 5 kg/drum
Part B: 0.5 kg/can
