What Are Epoxy Adhesives? Types & How They Work
Epoxy adhesives create powerful bonds when you mix resin and hardener. This chemical reaction rapidly hardens into a strong, durable solid with exceptional strength. Common types feature standard 2K epoxies for general tasks, low-exotherm versions for electronics potting, and high-strength epoxy structural grades for metals and composites. They provide superior adhesion, heat resistance, and chemical protection.
How to Select the Right Epoxy Adhesive in India
- Identify your substrates (e.g., metals, plastics, composites, PCBs) and any dissimilar materials.
- Determine the application type: potting/encapsulation, structural bonding, or coating.
- Assess performance needs: bond strength, temperature range (-40°C to +150°C typical for Supex), chemical & moisture resistance.
- Check thermal needs: choose low-exotherm grades for heat-sensitive electronics or EVs.
- Evaluate cure characteristics: pot life, working time, and full cure speed.
- Consider viscosity: low for deep potting, higher for gap-filling or vertical bonding.
- Review environmental exposure: humidity, chemicals, UV, vibration.
- Explore Supex customizable 2K options and request samples for testing.
- Match the best product to ensure long-term durability and reliability.
Applications of Epoxy Adhesives in IndiaÂ
Epoxy adhesives drive reliability in India’s key sectors with strong, durable bonding and protection. Supex 2K epoxies shine in potting, encapsulation, and structural uses—customizable, low-exotherm, and REACH-compliant.
- Electronics & Electrical Manufacturing Potting and encapsulation safeguard PCBs, sensors, transformers, coils, capacitors, and relays against moisture, dust, vibration, and thermal stress. Ideal for high-volume production in hubs like Mumbai, Pune, Bengaluru, and Noida.
- Electric Vehicles (EVs) Structural bonding assembles battery packs, motor housings, bus bars, and thermal modules. Provides electrical insulation, vibration resistance, and high-strength joins—critical for India’s fast-growing EV industry (two-wheelers, cars, commercial vehicles).
- Construction & Infrastructure Bonds concrete, steel rebar, grout, and heavy structures for repairs, anchoring, and reinforcement. Offers non-shrink, high-strength fixes for floors, walls, bridges, and industrial plants—widely used in urban development across Maharashtra, Gujarat, and beyond.
- Automotive & Transportation Supports component assembly, sensor potting, and vibration-damping bonds in vehicles, including EVs and traditional manufacturing.
- Other Industrial & Specialized Uses Protects solar panels in renewables, repairs marine equipment, seals oil & gas tools, and enables liquid marble/stone bonding for decorative applications.
1. Best Epoxy Adhesives for Electronics Potting & Encapsulation
 You need to protect electronics from moisture, dust, and shocks. Our 2K hybrid epoxy adhesives do this perfectly. They come in white, black, grey, or clear. They cure at room temperature. Hardness stays Shore D 50–60. Flow is smooth, stress is low, and air bubbles stay away.
For delicate coils, choose softer versions (Shore D 40–50). For heat-heavy parts, pick thermal conductive adhesives (0.6–1.1 W/mK). These work great on sensors, coils, chargers, transformers, and small devices. Â
Low Exotherm, Low stress Potting
- Potting & coating of delicate electronics parts
- Protection of parts from moisture, dust & impact
- Chemistry – 2K Epoxy Hybrid
- Available in White, Black & Grey color
- Curing: Ambient
- Hardness: Shore D 50 to 60
- Temp range: -40 + 150 ÂşC
- Excellent electrical properties
 Key features
- Non Abrasive safe to machine
- Excellent flow, cover narrow gaps
- Long pot life
- No air entrapment
- Low stress
- Low exotherm, Max 50 C
- Reliable & Durable bonding
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Marget Segments: Potting & Encapsulation
General Electronic : Small devices, Transformers, Chargers, Sensors, Coils Capacitors.
Auto Electronics: Sensor potting, Coil potting, Sealed relays, Thermal conductive potting, Thermal structural bonding
2. Sensor Protection
- Potting & Sealing of sensors
- Protection of sensors from water, dust, impact
- Chemistry – Epoxy Hybrid, epoxy adhesives
- Available in Clear, White, Black & Grey
- Curing: Ambient + heat / Dual
- Available in soft as well – Shore D 40 to 50
- Temp range: -40 + 150 ÂşC
- Excellent electrical
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Key features
- Easy mix ratio
- Non Abrasive
- Excellent flow
- Long pot life
- No air entrapment
- Low stress potting
- Reliable & Durable bonding
           
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3. Marget Segment: Encapsulation & BondingÂ
Consumer electronics Washing machine motherboard Refrigerator evaporator coils
Electrical vehicles: EV Battery, EV Motors control, Thermal conductive potting Thermal structural bonding
4. Market Segment: high strength epoxy Structural bondingÂ
Motor magnet bonding
EV Motor magnet bonding
Furniture stiffener bonding
5. Bus Bar coating Adhesive
- Excellent insulating properties
- Available in Red, Blue & Black color
- Customized color option available
- Chemistry – 2K Hybrid Epoxy
- Easy mix ratio – 2 : 1
- Excellent spreading & Non sag
- Easy to apply with brush or Roller
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Cured/ coated adhesive is
- Tough & Durable
- Resistant to moisture & many chemicals
- Impact & mechanical shock resistant
- Crack resistant
- Thermally stable material
- Flame retardant
6. Multipurpose High Strength Epoxy
- 2K Epoxy, Mix ratio – 100: 80
- Resistance to water and many chemicals
- Medium viscosity like Honey
- Cured adhesive is tough & crack resistant
- Excellent bonding with many substrates
- One solution many use
- Bathroom tiles bonding
- Kitchen platform bonding sealing
- Wall crack filling
- Wood bonding & crack filling
- Metal bonding
7. Liquid MarbleÂ
- Super white colour
- High strength with glossy finish
- Chemistry – Epoxy hybrid
- Resistance to water and many chemicals
- Easy mix ratio: 4 : 1
- Long pot life: 2 hrs @ 25 Cel.
- Excellent bonding with marble and stone
- Tack free: full cure 24 hrs @ Ambient temp
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Best suitable for
- Stone bonding
- Stone repair
- Gap filling
- Crack filling
- Tile gap filling
- Precious stone repair
- Stone articles repair
FAQs
What is the difference between potting and structural epoxy?
Potting epoxy and structural epoxy are both types of epoxy adhesives, but they serve very different primary purposes, formulations, and performance characteristics.
Key Differences
| Aspect | Potting Epoxy (Potting Compound) | Structural Epoxy (Adhesive) |
|---|---|---|
| Primary Purpose | Encapsulate / protect / embed electronic components (e.g., PCBs, circuits, sensors, transformers) for insulation, moisture-proofing, vibration damping, and environmental protection. | Bond / join two or more substrates (e.g., metals, composites, plastics) to create strong, load-bearing joints in structural applications. |
| Typical Viscosity | Low to medium (flowable) – designed to pour or flow easily into enclosures/housings without air pockets, filling complex shapes around delicate parts. | Medium to high/thixotropic (thick, gap-filling) – stays in place on vertical surfaces, forms fillets, and bridges gaps without sagging. |
| Mechanical Properties | Often rigid but can be formulated flexible; focus on electrical insulation, low exotherm (to avoid damaging heat-sensitive electronics), low shrinkage, and shock/vibration absorption. High dielectric strength and chemical/moisture resistance. | Extremely high shear/tensile/peel strength, toughness, and durability under load/stress. Prioritizes mechanical bonding strength over insulation. |
| Cure & Exotherm | Usually low exotherm during cure to prevent damage to embedded electronics; often room-temperature or slow cure for large volumes. | Can have higher exotherm; formulations optimized for fast or controlled cure in bonding applications. |
| Common Applications | Electronics potting/encapsulation (e.g., PCB protection, sensors in EVs, transformers, switches), cable sealing, harsh environment protection. | Structural bonding in construction, automotive/EV (e.g., metal/composite joining), aerospace, marine, machinery assembly. |
| Strength Focus | Protective/insulating strength + environmental resistance; not primarily for load-bearing. | Maximum bond strength and load-bearing capability (often highest among adhesives). |
| Examples | Supex low-exotherm potting epoxies for electronics/EV battery protection. | High-strength 2K structural epoxies for metal-to-metal or composite bonding. |
Quick Summary
- Potting epoxy functions mainly as a protective encapsulant or filler. It is poured to fully surround and shield delicate components, such as circuit boards sealed inside enclosures.
- High-strength structural epoxy serves as a true adhesive or bonding agent. It is spread in thin layers to create permanent, robust joints capable of handling heavy mechanical loads, impacts, or constant vibration.
While some epoxy adhesives offer overlap (e.g., a toughened potting type may provide partial structural strength, or a structural epoxy can fill small voids), they are formulated differently. For electronics in India—like EVs or PCBs—select potting-focused versions for optimal protection; for load-bearing connections, choose high-strength structural types.
If choosing Supex products, their potting epoxies prioritize low heat buildup and component safety, whereas high-strength structural ones emphasize superior bonding power. Share your exact use case for more precise recommendations!
How long does Supex high-strength epoxy take to cure?
Supex high-strength epoxy cure times depend on the specific grade and factors like temperature, mix volume, and ratio.
- High-strength structural epoxies: Typically offer room-temperature curing with pot life up to several hours; full cure often reaches in 24 hours.
- MMA-hybrid structural adhesives (e.g., M419, M1157): Cure much faster—working time 4–12 minutes, fixture/handling strength in 15–25 minutes.
Always refer to the product’s Technical Data Sheet (TDS) on supex.in for precise info, since cooler Mumbai weather (around 25–30°C) can slow curing. Applying gentle heat speeds up most epoxies safely when suitable.
Are Supex high-strength epoxies suitable for high-vibration applications?
Yes, Supex high-strength epoxies perform well in high-vibration settings, particularly in electronics, EVs, automotive, and industrial uses.
- High-strength structural epoxies and MMA hybrids (e.g., M419, M1157, GP0416): Designed to resist ongoing stress, vibration, impact, and fatigue. They deliver tough, flexible bonds with excellent shock absorption—perfect for load-bearing joints in vehicles, machinery, marine equipment, and EV assemblies under repeated cyclic forces.
Supex stresses vibration durability for India’s expanding EV and automotive sectors. Toughened high-strength grades excel at damping shocks without failure, ensuring reliable performance in dynamic, demanding environments.