Top 5 Problems With MMA (Methyl Methacrylate Adhesive)

Written by Caleb Shaw

Although the use of MMA comes with plenty of perks, like everything, there are drawbacks too. Having worked with the product for over 6 years, I have encountered many problems personally. So, in this blog I’m going to cover the 5 most common issues and how to deal with them.

1. The Scent

There’s no getting away from the scent associated with MMA. The scent itself isn’t harmful (guiltily I kind of like it), but in an enclosed space it can cause intense headaches. Simple solution – make sure you’re working in a well-ventilated area! If this isn’t possible, there are some helpful technologies about. You can now pick up an air fed visor for less than £300!

2. Exotherm

When MMA cures, the chemical reaction creates an exothermic reaction (heat). This reaction can cause distortion on sensitive paints, or damage to outer coatings. If this is a concern of yours, it may be worth considering a slower curing product or an MMA with a lower exotherm.

3. Impact Resistance

As a rule of thumb, a 1:1 ratio of MMA will have a lower impact resistance than a 10:1 MMA. This is due to the flexibility of the cured adhesive. If the resistance isn’t what you expect it to be, observe the mode of failure. Is the adhesive coming away from a powdered section? Has the powder-coat material changed?

4. Cost

Having worked in the adhesive industry for 8 years now, I have seen MMA being quoted over 10x what it’s worth. Realistically, MMA shouldn’t cost any more than £25 per kilo (if purchased in bulk), or £25 per 400-500ml cartridge (where purchased individually). We’d recommend buying directly from a manufacturer where possible.

5. Shelf Life

Some Methyl Methacrylate based adhesives have a shelf life of just 3 months. We believe that most products should have a life of between 9 – 12 months. If you’re in need of an extension, you can store unopened products in the refrigerator.

If after reading this you need any advice, please feel free to contact our team of specialists on the number above.