With the accelerated advancement of automotive intelligence, digital keys are becoming an important configuration for OEMs to enhance user experience. From NFC, BLE to UWB ultra wideband technology, the digital key integrates various electronic components internally, which puts higher requirements on the overall packaging and protective materials.
How to ensure that the circuit board is not affected by moisture or vibration in complex and demanding environments? How to improve overall weather resistance and service life? This is precisely the key scenario where the smart key sealing adhesive plays a role.
Among numerous material solutions, Yilian recommends high-performance PUR 1680 polyurethane potting adhesive – tailored for automotive digital key potting, with excellent fluidity, small gap filling ability, aging durability, and a bright and smooth cured appearance. It is one of the core materials for improving the reliability of smart keys.
Why do digital keys need to use professional sealing glue?
The car digital key has a compact structure and high component density, but its usage environment is extremely complex
Digital key sealing
High and low temperature impact (-40 ° C~85 ° C)
Drop vibration caused by handheld use
Long term risk of sweat, moisture, and rainwater intrusion
Outdoor ultraviolet radiation and long-term aging
Therefore, the requirements for sealing materials for digital keys include:
High fluidity, capable of filling small gaps, fully enveloping components
Moderate toughness, absorbing impact without damaging components
After curing, the appearance is smooth, without bubbles or whitening
Long term aging resistance, no yellowing or cracking
Good adhesion to materials such as PC, ABS, and metal
These performances can be perfectly met by PUR 1680.
02 PUR 1680- Ideal choice for sealing automotive digital keys
✔ 1. Excellent liquidity, strong sealing ability with small gaps
The internal structure of digital keys is compact, and there is often only millimeter level space between the components and the housing.
PUR 1680 has good fluidity and wettability, which can quickly penetrate into fine gaps, achieve complete encapsulation, effectively avoid voids, and improve sealing reliability.
✔ 2. The cured appearance is bright and the finished product has a good visual effect
After curing, PUR 1680 has a smooth and shiny surface, no shrinkage holes, and no bubbles, making it very suitable for electronic key products with appearance requirements.
Both transparent and dark colored shells can present a high-end and unified visual effect, which is conducive to enhancing the overall brand texture.
✔ 3. Excellent aging performance and stable weather resistance
Using automotive grade polyurethane system, PUR 1680 can still maintain reliable performance in the following environments:
High temperature exposure
humid environment
Sweat corrosion
Long term ultraviolet radiation
High and low temperature cycle
The material does not crack, stick, or pulverize, greatly improving the lifespan of digital keys.
✔ 4. Good resilience to protect internal components
The sealing layer combines flexibility and structural stability, effectively absorbing the impact force caused by falling or twisting, and protecting:
Bluetooth chip (BLE)
NFC antenna
UWB module
Battery solder joints
Micro PCB
Suitable for automotive electronic applications with high reliability requirements.
03 PUR 1680 Typical Application Scenarios
Car digital key sealing
NFC Keyless Entry System
UWB smart key module
BLE Bluetooth key electronic module
High precision encapsulation protection for small electronic products
Especially suitable for applications with small gaps, large areas of moisture, and requirements for sealing appearance.
Why choose Elaplus PUR 1680?
Verified through actual vehicle specification level projects
Stable production batch and long-term supply capability
Specialized formula for electronic sealing field
Support process coaching, encapsulation testing, and sample testing
Customized adjustments can be made according to customer needs (viscosity, curing speed, color, etc.)
In the era of increasingly sophisticated automotive electronics, choosing the appropriate sealing material is crucial for the reliability of digital keys.
PUR 1680 has become the preferred material for an increasing number of smart key manufacturers due to its excellent fluidity, appearance, aging stability, and strong ability to fill small gaps.
If you are looking for automotive digital key sealing solutions, PUR sealing adhesives, small gap sealing materials, or high reliability smart key adhesives, please contact Yilian for test samples and customized solutions.
Tags: pur 1680 · Small gap filling and sealing adhesive · Digital key adhesive · Smart key packaging · Automotive digital key sealing
