The UK Government has issued an official “Advice Note” to building owners concerned by HPL (high pressure laminate) panels in external wall systems, to be read in complement to the December 2018 Advice Note on panel systems. This indicates that panels with Euroclass C or D or “any type of panels containing combustible insulation” are unlikely to resist fire spread and that concerned building owners should take immediate action. The Advice specifies that HPL panels may or may not be flame retarded, and that FR HPL panels are typically Euroclass B-s1, d0. It is also indicated that even FR panels with stonewool insulation, as known today, do not achieve Euroclass A1 or A2-s1, d0, as now required for UK residential buildings >18m high (new or renovation).
UK Government “Guidance. Advice for owners of residential buildings with HPL systems. Advice for building owners on buildings with high pressure laminate (HPL) systems over 18 metres tall.” 18 July 2019 https://www.gov.uk/government/publications/advice-for-owners-of-residential-buildings-with-hpl-systems and “Guidance. Advice for building owners: external wall systems that do not incorporate ACM. Advice for building owners on external wall systems that do not incorporate Aluminium Composite Material.” December 2018 https://www.gov.uk/government/publications/advice-for-building-owners-external-wall-systems-that-do-not-incorporate-acm