Hansen Fittings Chemical Compatibility
Big Water Tanks is an official stockist of Hansen Products. This page sets out Hansen's published chemical resistance ratings for True Fit threaded fittings — reducing bushes, sockets, elbows, tees, nipples and other glass fibre reinforced nylon threaded fittings — so you can check a fitting is right for your application before you install it.
Hansen Fittings Chemical Compatibility
Hansen True Fit threaded fittings are moulded from high quality glass fibre reinforced nylon and are designed for water. They are tested to AS/NZS 4020:2018 for drinking water contact and rated "Good" for sea water. Some chemical groups attack the material, including chlorine at pool and spa strength, bleach, acids, halogens and oxidisers. The chart below reproduces Hansen's True Fit Threaded Fittings Chemical Resistance Chart (2025) in three ratings: Good, OK but check further, and Bad, try to avoid.
Important: This Chart Is a Basic Guide Only
As Hansen notes, resistance to a given chemical varies with temperature and concentration, and some chemicals within a group may rate differently. If your application involves anything other than water, please check with us or with Hansen before installing. Chemical damage is not something we can guess at, and it may not be covered by warranty.
Chemical Resistance Chart — True Fit Threaded Fittings
| Chemical Type | Hansen Resistance Level |
|---|---|
| Water & Farm | |
| Drinking water | ✔ Good |
| Sea water | ✔ Good |
| Bloat remedies (diluted) | OK — check further |
| Acids & Bases | |
| Acids — weak | ✘ Bad — try to avoid |
| Acids — strong | ✘ Bad — try to avoid |
| Organic acids — weak | OK — check further |
| Organic acids — strong | ✘ Bad — try to avoid |
| Bases — weak | ✔ Good |
| Bases — strong | OK — check further |
| Bleach | ✘ Bad — try to avoid |
| Fuels & Oils | |
| Automotive fuel | ✔ Good |
| Automotive lubricants | ✔ Good |
| Hydraulic fluids | OK — check further |
| Solvents & Organics | |
| Solvents | OK — check further |
| Hydrocarbons | ✔ Good |
| Halogens | ✘ Bad — try to avoid |
| Alcohols | OK — check further |
| Aldehydes | ✘ Bad — try to avoid |
| Amines | ✘ Bad — try to avoid |
| Esters | ✔ Good |
| Ethers | ✔ Good |
| Ketones | OK — check further |
| Cleaning & Oxidisers | |
| Detergents | ✔ Good |
| Oxidising agents | ✘ Bad — try to avoid |
| Weak hydrogen peroxide | OK — check further |
| Ozone | ✘ Bad — try to avoid |
| Phenols | ✘ Bad — try to avoid |
Source: Hansen Products (NZ) Ltd, True Fit Threaded Fittings Chemical Resistance Chart (2025). The group headings are ours, added for easier reading. Hansen lists the chemicals in its own groups.
How to Read the Ratings
- ✔ Good: Hansen rates the material as resistant to this chemical type in normal use
- OK — check further: May be suitable depending on concentration, temperature and exposure. Contact us or Hansen with the specific product before you install
- ✘ Bad — try to avoid: The chemical type attacks the material. Don't use True Fit threaded fittings in this service
Nut & tail fittings
Hansen publishes a separate chart for nut & tail fittings. For those, refer to the True Fit Tank Fittings Chemical Resistance Chart.
Common Questions We Get
- Swimming pools & spas: Not suitable. Hansen advises that the high concentration of chlorine in pool water attacks the material, and pool or spa use is not covered by Hansen's Limited Lifetime Warranty
- Bleach & chlorine dosing: Bleach and halogens are rated Bad. Keep True Fit threaded fittings away from chemical dosing lines
- Sea water & marine: Sea water is rated Good, and Hansen lists marine as a common application
- Stock water & bloat remedies: Diluted bloat remedies are rated OK but check further. Check the product label and ask us if you're dosing through trough lines
- Fuel & oil: Automotive fuel and lubricants are rated Good, and hydraulic fluids OK but check further
- Hot liquids: Hansen tests for cold water use up to 60°C (140°F) and doesn't recommend use above that
Chemical Compatibility FAQs
Yes. Drinking water is rated Good on Hansen's chemical resistance chart. Hansen True Fit threaded fittings passed AS/NZS 4020:2018 testing for products in contact with drinking water (Australian Water Quality Centre report 356792), and the range holds UK WRAS approval 251102715.
No, not at chemical strength. Hansen rates bleach and halogens (which include chlorine) as Bad, try to avoid, and advises against swimming pool and spa use because of the high chlorine concentration. Normal domestic drinking water is rated Good.
Hansen rates automotive fuel and automotive lubricants as Good and hydraulic fluids as OK but check further. Resistance varies with temperature and concentration, so check with us or Hansen for a specific application.
Hansen rates weak acids, strong acids and strong organic acids as Bad, try to avoid, and weak organic acids as OK but check further. Weak bases are rated Good and strong bases OK but check further.
An "OK but check further" rating means the result depends on concentration, temperature and the exact chemical. Hansen notes its chart is a basic guide only, and some chemicals within a group may rate differently. Email us or Hansen with the product name and how it's used before you install.