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How to Understand Nelcote E-765 Epoxy Prepreg, 120 E-Glass Reinforced

Today, working with epoxy resin is easier than ever. Rayming PCB & Assembly use it for bonding metal, plastic, or rubber. The epoxy resin has been pre-mixed with epoxide hardeners and stabilizers when we deliver it to you in the form of prepreg sheets. Then, we cut the sheet length. One side contains the low viscosity binder, while the other side has high viscosity binder and optional fillers that we can mix into either side depending on your needs.

The epoxy resin’s high resistance to heat and solvents and low cost make epoxy resin a good choice for use in cabinetry, automotive, and construction applications. In addition, epoxy resin can be helpful to repair cracked glass or plastic panes. Finally, we can incorporate it into a laminate product for added strength and durability. The epoxies are especially useful in any situation where you need to bond small or large glass areas together.

Depending on the size and appearance of the repairs you need to make, you will need to order up to a quarter or half of a ton. Nelco offers prepreg panels that we can cut into any shape and thin braid and fiberglass reinforcement ideal for tough situations. You also have the choice of using different types and quantities of filler. If you use epoxy resin in layered construction, you can even add metal sheeting to your project.

Why use Reinforced E-Glass

Building with reinforced glass can be one of the most satisfying, convenient, and secure ways of transforming your building or home. Installation is simple, removal can be expensive and challenging, and the material is virtually unbreakable.

The main reasons that people choose reinforced glazing are:

1. Security

Unless you deal with a high-tech, high-powered laser beam, there is no way of “peeling” or breaking through the reinforced glass. This makes it ideal for bank and retail installations. If you find yourself in the unfortunate situation of being robbed, you can safely retreat behind your reinforced windows and doors until the police arrive to apprehend the criminal.

2. Cost-Effective

The cost of reinforced glazing is relatively low compared with other security solutions. However, you will find that even the most expensive windows are still significantly cheaper than installing metal bars or grilles.

3. Easy to Install

The most common method of installing reinforced glass is using a product called glass-reinforced epoxy (GRE). We can do this in a few hours without any need for special tools.

4. Durable

Once installed, reinforced glazing will last forever and is virtually unbreakable. With proper maintenance and cleaning, reinforced glazing never needs replacing. Even if we expose the glass to extreme temperatures, it has a long-lasting surface. This means that your window will be able to withstand heat, frost, or rain in winter or heat during the summer months. Your glass will not crack, and therefore there will be no sharp edges.

5. Low Maintenance

There is no need for paint or preservatives as the surface of the glass is permanently sealed. If you want to change or update your window or door, you can replace the glass without having to change any of its other components.

6. Environmental

As a 100% natural product, glass-reinforced can be recycled and is 100% recyclable. The glass itself is over 90% sand and has zero impact on the environment. This material is non-toxic, waterproof, will not rot or mold, and will not lose strength in extreme temperatures. As it does not contain any additives that conventional glazing does, this material does not release harmful gases when exposed to fire or extreme temperatures.

Properties of Nelcote E-765

1. Shelf Life:

When you get the Nelcote E-765, it can last for up to 10 years if stored in a cool and dry location. Nelcote E-765 is often helpful in applications that require quick curing epoxy adhesives where high-performance durability and maximum bond strength are necessary. We determine the shelf-life of any resin by how soon we must use it after delivery by the manufacturer. If the user wants a longer-lasting product, it is essential to store Nelcote E-765 under the recommended conditions.

2. Gel Time:

The gel time indicates the consistency of the resin. We should mix the resin until it is viscous (almost like a syrup). If the epoxy is too thick, sand or grit can be helpful to thin it. If it is too thin, we can add more resin. In most cases, a 24-hour period is sufficient for curing.

3. Glass Transition Temp, Tg, Dry; DMA

The glass transition temperature indicates the melting point of the epoxy system and its susceptibility to heat. The glass transition temperature is a critical measurement because it can help decide if the resin is suitable for use in applications where we encounter high temperatures. For example, Nelcote E-765 has a Tg of 105°C, making it suitable for hot climate areas.

4. Dissipation Factor, Df

The dissipation factor (DF) indicates how much the epoxy system changes temperature with time. The higher the DF, the more the epoxy system will absorb and lose heat. As a result, the resin could become too thick and harden while curing or shrink while cooling

5. Dielectric Constant, e

The dielectric constant is a measurement used to describe the effectiveness of an insulator, particularly electrical insulation. Nelcote E-765 has a high dielectric constant of 4.3. This means Nelcote E-765 will not conduct electricity. However, it contains an electrically insulating material to protect the electrical components from short circuits or damage.

6. Shear Strength

Nelcote E-765 has a shear strength of 250 psi. Shear strength is the measurement of the force that the resin can withstand when pulled apart in a direction parallel to its surface. It is important to note that shear strength is not a measurement of tear resistance.

7. Compressive Modulus

This describes the force required to deform a material/substance (i.e., compress it). For example, if you were to apply a load in a direction parallel with the surfaces of the resin, then it would require a certain amount of force to compress it. Compressive modulus is essential in conjunction with the shear strength and elongation to determine the strength(s) and weakness(es).

8. Compressive Strength

This describes the amount of force that a material can withstand when placed under a load. It is important to note that shear and compressive strength are two separate measurements used for different purposes.

9. Tensile Modulus

This describes the force required to deform a material/substance (i.e., elongate it). For example, if you were to apply a load in a direction perpendicular to the surfaces of the resin, then it would require a certain amount of force to elongate it.

10. Tensile Strength

This describes the amount of force that a material can withstand when placed under a load. It is important to note that shear and tensile strength are two separate measurements used for different purposes.

11. Thickness, cured, per ply

We describe the thickness of the cured epoxy in terms of the amount of pressure required to be applied before the epoxy system reaches its maximum compressive/tensile strength.

12. Volatiles

Volatiles refers to compounds used in the epoxy resin. Amounts and volatiles can cause problems curing or imbuing their properties on the epoxy system. We should consider this when evaluating the potential for problems with a particular resin.


Glass-reinforced plastic consists of glass fibers embedded in epoxy resin to produce a rigid but lightweight material. The fibers are sustained in the resin by being coated in resin from the outside. Nelcote E-765 Epoxy Prepreg, 120 E-Glass Reinforced, is used for making non-structural glass-reinforced plastic parts. We should store this in an environment with stable temperatures and relatively low humidity.