Plastics. Polyols for use in the production of polyurethanes. Determination of hydroxyl number by NIR spectroscopy1 Scope This International Standard specifies a method for the determination of hydroxyl numbers of polyols using NIR (near infrared) spectroscopy. Definitions and calibration techniques are given. Procedures for selecting calibration materials and for collecting and processing data to develop NIR calibrations are outlined. Criteria for building, evaluating and validating the NIR calibration model are also described. Procedures for sample handling,

BS 4819-2 has been prepared to meet the needs of manufacturers and users for standardizing the dimensional requirements and method of rating transformers for portable spot welding guns

The procedure is applicable to products intended for use in aerospace applications

double crimping

This standard does not cover products for corrosion protection of pre-stressing steels and stainless steels

Emergency power systems

Veterinary products manufacturers

BS ISO 20501  is restricted to test specimens (tensile

BS EN 3384-2:2019 supersedes BS EN 3384-2:2012

NOTE 1 Generally

and automation

and scanning electron microscopy (SEM)

Why should you use ISO 1641-1 – End mills and slot drills