Epoxy is a family of cured end products or basic components of epoxy resins. When it is in its liquid form, it can infuse, coat, and laminate materials such as carbon and wood to provide:

- Waterproofing
- Strength
- Durability

After drying the epoxy, it becomes a resin that provides many benefits to various components, especially PCBs. However, there are many epoxies in the market today, each bearing different benefits and applications. We shall hence look at the Nelco N4000-7 EF Halogen-Free Epoxy. An epoxy that is not just efficient but also environmentally friendly.

## About the Nelco N4000-7 EF Halogen-Free Epoxy

The Nelco N4000-7 EF Halogen-Free Epoxy is an eco-friendly epoxy that offers CAF resistance for:

- High-temperature assembly designs
- Lead-free assembly designs

## Features of the Nelco N4000-7 EF Halogen-Free Epoxy

The Nelco N4000-7 EF bears the following features:

### Outstanding thermal stability and moisture resistance

The Nelco N4000-7 EF is compatible with lead-free assembly for designs that have a high layer count. The design is also environmentally conscious for high-reliability applications.

The low moisture intake makes this epoxy reliably during the solder reflow process. It also comes in handy during the repair procedure.

### Electrical values that are not compressed

When it comes to electrical performance, this epoxy has no compromises. It eliminates bromine, making it more efficient when you compare it with other bromine components.

Also, if you compare this epoxy with other FR-4 standard loss epoxy systems, you will note that it has superior electricity performance.

### Halogen Free

The Nelco N4000-7 EF provides a halogen-free and lead-free solution. It is hence eco-friendly.

### CAF resistance

CAF resistance plus low Z-CTE offers a prolonged reliability rate for complex design using:

- More circuit densities and
- A low feature pitch

### High Tg FR-4 processing

Processes, in this case, utilize standard high Tg FR-4 methodologies.

The epoxy undergoes a 90 minutes press at around 193^{0}C and 275 to 350 psi

### Other features

- The Nelco N4000-7 EF is vacuum laminated
- It is available in many constructions, glass styles, and copper weights
- The Nelco N4000-7 EF meets IPC-4101/94 and UL 94V-0 specifications
- It is also RoHS compliant

## Applications of the Nelco N4000-7 EF

The Nelco N4000-7 EF has the following applications:

- Backplane applications
- Generation of wireless communications
- In direct chip attachment
- To develop telecommunication infrastructures
- In MCM-Ls
- To develop surface mount multilayers
- To create fine line multilayers
- In Lead-Free assemblies
- To build automotive electronics
- To develop BGA multilayers

## Physical Properties of the Nelco N4000-7 EF

The Nelco N4000-7 EF has the following physical properties:

**Density **– the density of the Nelco N4000-7 EF stands at:

- 1.92g/cc (at 50% resin content)

**Water absorption – **the water absorption rate of the Nelco N4000-7 EF epoxy stands at:

- 0.10%

## Mechanical properties of the Nelco N4000-7 EF

The Nelco N4000-7 EF has the following mechanical properties:

**Peel strength – **the peel strength of the Nelco N4000-7 EF is as follows:

- After process solution exposure, the peel strength of the Nelco N4000-7 EF stands at 0.982 kN/m
- At high temperatures, the peel strength of the Nelco N4000-7 EF goes up to 0.999 kN/m
- After the solder float process, the peel strength spike up to hit 1.17 kN/m

## Thermal Properties of the Nelco N4000-7 EF

The Nelco N4000-7 EF bears the following thermal properties:

**CTE, Linear **– The Nelco N4000-7 EF has the following CTE linear values:

- At a temperature range of -40
^{0}C – 125^{0}C, the Nelco N4000-7 EF has a CTE Linear of 12.0 to 17.0 µm/m-°C (X/Y) - At a temperature range of 50.0 to 165
^{0}C, the Nelco N4000-7 EF has a CTE Linear value of 65.0 µm/m-°C - Lastly, the Nelco N4000-7 EF has a CTE Linear value of 250 µm/m-°C at a temperature range of 165 to 260 (Z-axis alpha)

**Specific heat capacity – **Nelco N4000-7 EF epoxies have a specific heat capacity of:

- 0.962 J/g-
^{0}C

**Thermal conductivity **– the thermal conductivity of a Nelco N4000-7 EF epoxy stands at:

- 0.470 W/m-K

**Tg, glass transition temperature – **standard Nelco N4000-7 EF epoxies have the following Tg values:

- 155
^{0}C (TMA) - 165
^{0}C (DSC) - 190
^{0}C (DMA)

**Decomposition temperature **– the Nelco N4000-7 EF bears the following decomposition temperature:

- 425
^{0}C (at a weight loss of 5%)

**Flammability, UL94 – **Nelco N4000-7 EF epoxies have a flammability of:

- V-0

## Electrical properties of the Nelco N4000-7 EF

The Nelco N4000-7 EF has the following electrical properties:

**Volume resistivity – **as per volume resistivity, the Nelco N4000-7 EF takes on the following values:

- 1.00e + 13 ohms-cm (C-96/35/90)
- 1.00e + 13 ohms-cm (E-24/125)

**Surface resistance – **the surface resistance of the Nelco N4000-7 EF is as follows:

- 1.00e +12 ohms (C-96/35/90)
- 1.00e + 12 ohms (E-24/125)

**Dielectric constant – **the dielectric constant of the Nelco N4000-7 EF is as follows:

- At a frequency of 1.00e + 10 Hz, the dielectric constant stands at 3.8 (spit post cavity)
- At a frequency of 1.00e + 9 Hz, the dielectric constant hits 4.0 (RF impedance)
- When the frequency is set to 1.00e + 6 Hz, the dielectric constant hits 4.1

**Dielectric strength – **the dielectric strength of the Nelco N4000-7 EF stands at:

- 39.4 kV/mm

**Dielectric Breakdown – **the dielectric Breakdown of the Nelco N4000-7 EF is:

- >=50000 V

**Dissipation factor **– the dissipation factor of the Nelco N4000-7 EF is as follows:

- At a temperature of 1.00e + 6 Hz, the dissipation factor is 0.013
- When you turn up the frequency to 1.00e + 10Hz, the dissipation factor hits 0.016

**Arc resistance – **The arc resistance of the Nelco N4000-7 EF is:

- 158 seconds

## Descriptive properties of the Nelco N4000-7 EF

The Nelco N4000-7 EF bears the following descriptive properties:

**Methylene chloride resistance **– Nelco N4000-7 EF epoxies have a methylene chloride resistance of:

- 0.02

**T260 (minutes) – **The T260 of the Nelco N4000-7 EF is:

- > 30

**T288 (minutes) – **the T288 of the Nelco N4000-7 EF lies between:

- 2-4

**Z-axis expansion (in percentage) – **The Nelco N4000-7 EF has a Z-axis expansion of:

- 3.5 (50
^{0}C to 260^{0}C)

## Conclusion

The Nelco N4000-7 EF Halogen-Free Epoxy has no halogens, and it supports lead-free assembly. These two features make the Nelco N4000-7 EF Halogen-Free Epoxy environmentally friendly. Therefore, if you are all about a greener future, you will love this epoxy. What’s more, it has CAF resistance and CTE, which boosts its durability. Therefore, when you utilize this epoxy, the final product will ultimately have a longer life span. Hence, if you are looking to save the planet and develop quality, you should try out this excellent epoxy.