Arkema expands its Rilsan HT (high temperature) range to include an ultraflexible grade that is close to the flexibility of polyamide extrusion grades. According to Arkema, Rilsan HT is the first flexible polyphthalamide (PPA)-based material to replace metal in high-temperature tubing applications. The addition of the ultraflexibility offers new opportunities for cost-effective alternatives to metal, rubber, or fluorinated polymers in tubing. This latest member of the Rilsan HT family shifts modulus boundaries even further downward, close to 500 MPa (72.5 ksi). Suitable for under-the-hood automotive applications, this ultraflexible grade offers improved thermal resistance, with service time at a given temperature further extended and service temperature for a given service time increased by up to 10°C (18°F) when compared with the existing range.