In the trend of intelligent, lightweight, and modular electronic components, the reliability of encapsulation materials is becoming a key design consideration. Today, Yilian brings a star material that has been validated in multiple terminal scenarios – Elaplus PUR 1680 (D70) two-component polyurethane sealant, and shares a case study with the application scenarios of sensor products.
Filled PU Potting
1、 Customer background and pain points
A first tier international automotive parts supplier mainly produces electronic sensors for vehicles, including temperature sensors, position sensors, pressure sensors, etc. Its products need to work in complex working conditions for a long time, such as high temperature, high humidity, and strong vibration environments. The previously used foreign brand epoxy sealant had the following issues:
After solidification, the colloid is brittle and prone to cracking during thermal shock;
Poor control of bubbles during the sealing process resulted in high electrical breakdown rates for some batches of products;
The high water absorption rate of the material leads to signal drift after long-term wet heat testing;
The customer is looking for an alternative material that can balance “stable electrical performance, reliable sealing, waterproof and heat-resistant, non-toxic and environmentally friendly”.
2、 Recommended material: Elaplus PUR 1680 (D70) high hardness polyurethane sealant
The recommended sealing solution for it is Elaplus PUR 1680 (D70) A/B two-component polyurethane adhesive. This material is designed specifically for mid to high end electronic packaging and has excellent comprehensive performance. It has been widely used in communication equipment, power modules, controllers, vehicle sensors, industrial control board encapsulation, and other fields.
The core advantages include:
High hardness and toughness: Shore D65 ± 5 hardness after curing, balancing structural protection and stress buffering;
Excellent electrical insulation performance: volume resistivity up to 5 × 10 ¹⁴Ω· cm, dielectric strength up to 20kV/mm;
Extremely low water absorption rate: 24-hour water absorption rate<0.2%, outstanding moisture resistance;
Stable thermal performance: operating temperature range of -50 ℃ to 130 ℃, thermal conductivity of 0.65 W/m · K, suitable for heat dissipation of electronic components;
Flame retardant grade V-0 (3mm): meets UL94 standard, enhances product safety level;
Suitable for complex substrates: it has good adhesion to most metal and plastic surfaces;
Good process adaptability: low viscosity after mixing, easy to inject glue, good self leveling performance, suitable for automated production.
3、 Actual application effect
After replacing the original material with Elaplus PUR 1680 (D70), the customer conducted a 6-month verification test and found significant results
Good sealing adaptability
The customer adopts the AB two-component static mixing injection molding process, which ensures good flowability of the material at room temperature, uniform sealing, and almost no bubble phenomenon.
Significant improvement in reliability
All sealed products have passed the high-temperature and high humidity aging test at 85 ℃/85% RH for 168 hours, as well as 300 cycles of cold and hot shock from -40 ℃ to 125 ℃, without cracking, peeling, or dielectric breakdown issues.
Improve qualification rate and production capacity
Control the curing time of the material at 24 hours (room temperature) or 70 ℃/2 hours to accelerate the overall process rhythm; The product qualification rate has increased from 93% to 98.7%.
Cost reduction
Due to the fact that the material does not require a primer, has good compatibility with the substrate, and has stable supply, the customer has successfully achieved domestic substitution and reduced raw material costs by about 18%.
4、 Environmental Protection and Safety Assurance
PUR 1680 (D70) is solvent-free and heavy metal free, meets environmental requirements, and has passed UL V-0 flame retardant certification. It is a green, safe, and sustainable polyurethane potting material. During use, it is recommended to wear protective gloves and goggles, and maintain good ventilation at the construction site.
6、 Summary
With the development of precision and miniaturization of electronic devices, traditional epoxy or silicone materials have gradually exposed their material performance shortcomings in certain situations. PUR 1680 (D70), with its excellent electrical performance, mechanical strength, and environmental stability, has successfully solved the reliability problem of sensors for customers, achieved domestic material substitution, and is the preferred solution for highly reliable packaging of electronic components.
If you are also facing similar sealing difficulties, please feel free to contact us for free sampling and technical consultation!
Tags: pur 1680 · Sensor Packaging Adhesive · Sensor Sealing Adhesive · Domestic Replacement of Sealing Adhesive · Environmentally friendly Polyurethane Adhesive · Electronic Sealing Material · Polyurethane Sealing Adhesive · Moisture proof Sealing Adhesive
