ISO 23766:2022 pdf download – Thermal insulating products for industrial installations — Determination of the coefficient of linear thermal expansion at sub- ambient temperatures. 5.2 Apparatus 5.2.1 Sensor for distance A displacement measurement sensor reading to the nearest 1 µm, with a load less than 50 Pa, shall be used for the measurement of the relevant dimension / length of rigid specimen. For soft insulation products, the required load for the determination of the thickness according to the product standard shall be taken into account. If no product standard exists, the load should be agreed between the involved parties. 5.2.2...