Polyester resin, often referred to as fibreglass resin, is a type of synthetic polymer used for creating a wide range of products, including fibreglass and composites.
It has become increasingly popular in recent years due to its low cost and versatility. It is comparably cheaper when matched up against other resins such as epoxies and urethanes. Whilst standing up as a solid, even superior option in many applications.
Polyester resins are composed of two main ingredients: an acid such as styrene or vinyl ester and a monomer such as ethylene glycol. When the two ingredients are mixed together, they form a plastic-like substance with a wide range of applications.
Polyester resin is used in numerous industries due to its ability to adhere to many different surfaces. It is often used for casting moulds, creating composites, and laminating fibreglass. This type of resin is also widely used in the automotive and marine industries, making it a great choice for those looking to create a custom part or repair an existing one.
In this article, we will talk about the general application of polyester resin. As well as its benefits and tips for usage.
What are the benefits of using polyester resin?
Working with polyester resin offers many benefits to a variety of projects. Some of these include:
Low cost
It is very cost-effective, making it a great choice for those on a budget. Polyester resin remains comparatively cheaper than most other resins on the market, as little as five times the cost.
Water & Chemical Resistance
It offers excellent water and chemical resistance, making it the ideal material for many marine or automotive repairs as well as the ability to provide a waterproofing system, protecting a variety of structures.
Through its exceptional resistance to chemicals, it is often the resin of choice for many lining and coating systems. It offers high resistance to chemicals such as dilute alkalis and acids, oils and greases.
Resistance
Polyester resin offers resistance to numerous variables such as weather and ageing. It has the ability to withstand extreme weather conditions such as snow, ice and winds.
Low Shrinkage
Polyester resin usually has a shrinkage rate of 4-8% during curing, but can be even lower depending on the conditions. The low shrinkage rate means that the finished product will maintain its shape and stay strong.
What are the types of polyester resins?
One of the many benefits towards polyester resin as an ingredient in composite structures like fibreglass is its ability to adjust its ingredients, tailoring its properties towards a particular or desired attribute.
There are several different types of polyester resin available, each with its unique properties and uses. There are four main types of polyester resin available for usage, these are:
- Vinyl ester
- Alkyd
- Saturated polyester
- Unsaturated polyester
Working with Polyester Resin at Home
Safety Precautions
When working with polyester resin, it is important to follow basic safety precautions. Wear protective gear such as gloves, overalls, a face mask and eye protection when handling the material. Ensure that you are in a well-ventilated area and avoid breathing in fumes from the resin or any of its components.
Materials Needed for Working with Polyester Resin
For working with polyester resin, you will need a few basic materials: a mould of your desired shape, the resin itself, a hardener or catalyst, and stirring sticks. You may also need additional materials such as wax paper to line your mould and release agents to prevent the resin from sticking.
Preparing the Mould and Applying the Resin
Before applying the resin, you will need to prepare your mould by ensuring it is clean, dry and free of any debris. It’s important to use a release agent such as wax paper or petroleum jelly to help prevent the resin from sticking to the mould.
Once the mould is prepared, mix together the resin and hardener or catalyst at a ratio of 1:1. Use stirring sticks to ensure that the two components are thoroughly combined. Pour this mixture into your mould and let it sit for 12-24 hours until it has fully cured. Once cured, remove your newly created part from the mould and you’re ready to use it.
Conclusion
Polyester resin is a great choice for many projects due to its low cost, excellent water and chemical resistance, and ability to offer high resistance against weather and ageing.
With some basic safety precautions and the right materials, you can easily create your desired part using polyester resin.