LatiThe new thermoplastic compounds can be used for parts in contact with drinking water
European thermoplastic compounder, LATI, has spent several years developing engineering plastic compounds to replace metal in items intended for contact with hot and cold drinking water.
In 2009, the group’s PA66-based structural compounds (tradename Latigloss) obtained certificates of suitability for contact with water according to the WRAS (hot and cold water), NSF 61 (hot and cold water), ACS, KTW, and W270 standards.
This encouraged the extension of the water contact product portfolio, according to the group. In particular, LATI has now concentrated on expanding its range of plastics for contact with hot water, an application where polyamide 66 has some limitations.
The base resin for the new range is aromatic polyamide (PPA). Compared to PA66, LATI says that PPA provides resistance to hydrolytic and extractive action of hot water, even during prolonged exposure. Natural moisture absorption is said to be very low, even at high temperatures. This allows the PPA to keep its mechanical properties when immersed, reducing the risk of leaks or failure due to the typical swelling of wet polyamide.
LATI says that all of its compounds are developed to replace metals, hence they feature substantial structural reinforcement made of 40-60 percent glass fibre.
LATI submitted the full Latigloss 57 F2 product range in the ‘natural’ and ‘black’ versions to the aforementioned certification bodies. Results reportedly showed that Latigloss 57 F2 is best suited to contact with cold and hot drinking water up to 85°C. The compound was shown to combine low residue values with good resistance to fungi and algae growth.
Potential applications for the range include valves, mixers, tanks, taps, connecting parts and all parts in continuous contact with cold and hot drinking water, says LATI.
The certifications allow safe use throughout Europe, as well as the USA.