Key material issues continued http://sappi-reports.co.za/reports/sappi-iar-http://sappi-reports.co.za/reports/sappi-iar-2018/risk-management.php#7 www.sappi.com 2018 Group Sustainability Report 27 Valida nanocellulose Valida is a lightweight, solid substance which is comprised of nano-sized fibrils―the high strength building blocks of cellulose fibres.