NB/SH/T 0989-2019 in English

This document outlines a specific method for evaluating the resistance of underbody wax used in automotive applications to stone impact. It provides detailed procedures for conducting tests that simulate real-world conditions encountered by vehicles on the road. The test method is designed to assess the performance and durability of the wax under various impact scenarios, ensuring that it can effectively protect the vehicle's underbody from damage caused by flying debris. The standard includes specifications for test equipment, sample preparation, test conditions, and the criteria for evaluating the results. It serves as a reference for manufacturers, testing laboratories, and other stakeholders involved in the production and evaluation of automotive underbody wax products. The procedures described are intended to be repeatable and reproducible, allowing for consistent assessment of product quality and performance.