The Top 3 Primary Resins used in Cured-in-place-pipe & Pull-in-place Repair Methods
Both cured-in-place-pipe (CIPP) and pull-in-place methods are basically the same as both processes involve inserting a resin liner into the pipelining which then turns into the main pipes of the sewer system. The key and only difference of the two is how the resin liner is inputted into the pipes as CIPP places the liner together with a bladder to position it in the right place, and then inflated to allow the resin liner to bond with the old/host pipes. Meanwhile a pull-in-place repair method pulls the liner with the use of two access points. The resins used will depend on what the manufacturer has or whatever is best for the condition of the pipes, but there are a few primary resin types that are usually used in pipe relining, learn more about these types below.
Epoxy resin material
Epoxy resin is definitely the toughest liner used in pipe relining if compared to the other primary resin types that will be discussed later on. It’s a favourite among the lateral lining contractors because of its superior durability. Apart from that, it doesn’t contain strong chemicals that cause caustic odours and carcinogenic substances. Amidst all the primary resins, it’s the epoxy material that has the tightest hold when bonded with a pipe lining. Its shrink rate is little compared to the other two resins; making it a better choice if you want a resin liner that doesn’t require too much maintenance and still has an excellent performance despite the pipe liner getting aged. Epoxy is far from perfect as it does have a bit of a flaw with its design. Because it’s much tougher than the other resins, it takes a really long time to have it cured. Careful planning must be done in order to get the pipe relining process done faster when using epoxy resin.
Polyester resin is favoured by most main line contractors because of its affordability while still meeting the standards and requirements needed for the sewer pipeline industry. Aside from those advantages, polyester resin trumps epoxy resin when it comes to curing time since polyester can be cured quickly. However, this resin type has more drawbacks than epoxy since it has chemical smells due to its styrene substance while also having traces of volatile organic compounds. Furthermore, it’s not as tough as epoxy and can shrink quickly.
Vinyl ester resin
Vinyl ester is a combination of both polyester resin and epoxy, making it a very durable resin. However it’s not as durable as epoxy but its chemical and corrosion resistance is second to none. Both epoxy and polyester can keep up with chemicals that have a pH of 1 up to 11, but vinyl ester on the other hand is able to resist chemicals with pH that are lower than 1 and up to 14. Vinyl is more expensive than polyester but much more affordable than epoxy. Unfortunately, vinyl has a lot of disadvantages; in fact, it has the same problems with polyester such as very fast shrink rate, chemical composition, volatile organic compounds, etc.