In power transmission, communication infrastructure and industrial automation industries, cable junction boxes are core components for connecting and protecting cable joints. Their waterproof, moisture-proof and weather resistance directly determine the operational reliability of the entire system.
Traditional potting materials have obvious application drawbacks: non-repairable after curing, failure prone to moisture, narrow temperature resistance range, etc. These issues raise maintenance costs and bring potential safety risks.
ELAPLUS launches two repairable silicone gels, SIGEL 1805 and SIGEL 3078. Featuring premium performance and easy repairability, they deliver an innovative technical solution for cable junction box potting.
Ⅰ. Industry Pain Points of Traditional Potting Materials
1. Core Requirements for Cable Junction Box Potting
| Core Demand | Specific Requirement | Performance Index |
| Waterproof & Moisture-proof | Block moisture intrusion and protect electrical connections | Low oil bleeding, high dielectric strength |
| Electrical Insulation | Stable operation under high voltage | Dielectric strength ≥25kV/mm |
| Weather Resistance | Long-term outdoor anti-aging | Operating temperature: -60~200℃ |
| Stress Buffering | Relieve thermal stress and mechanical vibration | High elasticity, low hardness |
| Repairability | Convenient later maintenance & cost saving | Easy-to-remove gel state |
2. Drawbacks of Traditional Materials
| Drawbacks | Specific Performance | Resulting Problems |
| Non-repairable curing | Rigid materials like epoxy resin cannot be removed without damaging components | leading to high maintenance costs. |
| Oil bleeding & contamination | Severe oil bleeding pollutes terminal blocks | increases contact resistance and impairs electrical performance. |
| Narrow temperature resistance | Softens at high temperature and cracks at low temperature | failing in extreme outdoor conditions |
| Overly strong adhesion | Firm bonding with substrates | causes component damage during repair |
3. Advantages of Silicone Gel
※Soft gel state after curing to eliminate mechanical stress
※Repairable design for easy removal without component damage
※Ultra-low oil bleeding to avoid metal contact contamination
※Wide temperature tolerance: -60℃ ~ 200℃ for harsh environments
※Superior dielectric strength for reliable high-voltage protection
Ⅱ. Product Introduction
1. SIGEL 1805 Two-component Silicone Gel
Product Positioning
SIGEL 1805 is a two-component transparent silicone gel developed by ELAPLUS for application scenarios such as cable junction boxes and power modules. Adopting a 1:1 addition curing system, it cures into a flexible and soft material with excellent cushioning performance.
| Property Category | Specific Performance |
| Curing System | 1:1 addition cure type, high elasticity |
| Softness | Excellent softness, relieves mechanical stress |
| Oil Bleeding | Ultra-low oil bleeding after curing, excellent poisoning resistance |
| Electrical Insulation | Superior high-temperature insulation, provides protection under high voltage |
| Weather Resistance | Outstanding aging resistance and weatherability |
| Protection Performance | Excellent waterproof, anti-corrosion, moisture-proof and chemical resistance |
Typical Applications:
Power module encapsulation (thyristor, solid state relay, diode)
Cable junction box & waterproof enclosure potting
Motor lead box
EV control box.
2. SIGEL 3078 Two-component Self-healing Silicone Gel
Product Positioning
SIGEL 3078 is a high-end transparent two-component self-healing silicone gel launched by ELAPLUS. It inherits the performance of SIGEL 1805 and adds self-healing properties, specially designed for precision electronic modules requiring high reliability.
Core Characteristics
| Property Category | Specific Performance |
| Curing System | 1:1 addition curing with strong adhesion |
| Self-healing | Self-healing capability, automatically repairs micro cracks |
| Softness | High elongation and excellent flexibility to eliminate mechanical stress |
| Oil Bleeding | Extremely low oil bleeding after curing, excellent anti-poisoning performance |
| Electrical Insulation | Excellent high-temperature insulation, provides reliable protection against high voltage |
| Weather Resistance | Outstanding aging resistance and weatherability |
| Protection Performance | Excellent waterproof, anti-corrosion, moisture-proof and chemical resistance properties |
Typical Applications:
IGBT power semiconductor encapsulation
Load cell potting
Automotive ECU module encapsulation
IC chip packaging
Power & telecom waterproof connector potting.
III. Technical Parameter Comparison
Pre-curing Parameters
| Item | SIGEL 1805 CLEAR | SIGEL 1805 BLUE | SIGEL 3078 |
| Composition | A:PolysiloxaneB:Hydrogen-containing polysiloxane | A:PolysiloxaneB:Hydrogen-containing polysiloxane | A:PolysiloxaneB:Hydrogen-containing polysiloxane |
| Appearance | Colorless fluid | A:Colorless fluidB:Blue fluid | A:Colorless liquidB:Colorless/light blue liquid |
| Viscosity(25℃) | A:1100±200 CPSB:1000±200 CPS | A:500±100 CPSB:500±100 CPS | A:700 mPa.sB:650 mPa.s |
| Specific Gravity | 0.99±0.02 g/cm³ | 0.99±0.02 g/cm³ | 0.99 g/cm³ |
| Mixing Ratio | A:B=100:100 | A:B=100:100 | A:B=100:100 |
| Mixed Viscosity | 1100±200 mPa.s | 500±200 mPa.s | 700 mPa.s |
| Working Time | 15±5 mins | 7±3 mins | 20±5 mins |
| Initial Curing Time | ≤60 mins | ≤20 mins | 50 mins |
Post-curing Parameters
| Item | SIGEL 1805 | SIGEL 3078 |
| Cured Appearance | Transparent/Blue Gel | Colorless Transparent Gel |
| Hardness (Shore 00) | 35 | — |
| Penetration | CLEAR:80BLUE:260/60 | 86 (4hr) / 78 (24hr) |
| Dielectric Strength | 25 kV/mm | 25 kV/mm |
| Volume Resistivity (DC500V) | 1.0×10¹⁴ Ω·cm | 1.0×10¹⁵ Ω·cm |
| Dissipation Factor (1MHz) | 0.009 | <0.001 |
| Dielectric Constant (1MHz) | 2.8 | 2.8 |
| Operating Temp. Range | -60 ~ 200℃ | -60 ~ 200℃ |
IV. Product Selection Guide
| Comparison | SIGEL 1805 | SIGEL 3078 |
| Curing Speed | Moderate (60mins initial cure) | Fast (heat cure: 20mins /80℃) |
| Viscosity Option | 500/1100 CPS available | Standard 700 CPS |
| Self-healing | Yes | Yes |
| Core Advantage | Flexible & multiple viscosity options | Self-healing & high reliability |
| Pricing | Economy Grade | High-end Grade |
| Recommended Use | General cable junction box & power module | Precision sensor & high-reliability module |
V. Repairable Process (Core Advantage)
Unlike traditional rigid potting materials, SIGEL silicone gel cures into a soft gel state and can be easily removed for rework in the following ways:
| Rework Method | Application Scenario | Operation Key Points |
| Physical Scraping | Small-area rework | Gently scrape off the gel with a plastic scraper to avoid damaging components |
| Solvent Cleaning | Residue removal | Clean residual gel with alcohol or dedicated detergent |
Rework Advantages
No component damage is required. Only remove the gel to conduct wiring inspection or component replacement, which greatly reduces maintenance costs.
VI. FAQ
Q1: Difference between silicone gel and epoxy potting adhesive?
A: ① Cured state: Silicone gel is soft; epoxy is rigid solid.
② Repairability: Silicone gel is easy to remove; epoxy is hard to repair without damage.
③ Temperature resistance: Silicone gel covers -60~200℃.
④ Oil bleeding: Silicone gel features ultra-low oil bleeding.
Q2: Can SIGEL 1805 and SIGEL 3078 be mixed?
A: Not recommended. Different formula systems may affect curing performance; select one model according to application.
Q3: Is cured silicone gel skin-safe?
A: Fully cured gel is non-toxic. Wear gloves during operation; rinse with clean water if skin contact occurs.
Q4: Service life for outdoor cable junction box?
A: Excellent aging and weather resistance ensures long-term stable performance. Service life varies with temperature, humidity and UV exposure; regular inspection is recommended.
Q5: Recommendation for fast curing?
A: Choose SIGEL 1805 BLUE (7±3 mins working time, ≤20 mins initial cure); or SIGEL 3078 heat curing (20mins /80℃ for full cure).
Q6: Color options available?
A: SIGEL 1805: Clear & Blue; SIGEL 3078: Standard transparent.
SIGEL 1805 and SIGEL 3078 silicone gels integrate the comprehensive advantages of repairability, low oil bleeding, wide temperature resistance and high electrical insulation, delivering reliable potting and protection solutions for cable junction boxes, power modules, sensors and other applications.
All performance parameters stated herein are sourced from the official ELAPLUS product datasheets. Actual application results may vary depending on working conditions. For further technical communication, feel free to leave a comment or contact us via private message.
