GB/T 8333-2022Plastic—Test method for flammability of rigid cellular plastic—Virtical burning method (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 8333-2008 "Test Method for Combustion Behavior of Rigid Foamed Plastics - Vertical Combustion Method", and is consistent with GB/T 8333- Compared with.2008, except for structural adjustment and editorial changes, the main technical changes are as follows.

--- Changed the scope of application of the standard (see Chapter 1, Chapter 1 of the 2008 edition);

--- Added and updated relevant normative references (see Chapter 2, Chapter 2 of the 2008 edition);

--- Added the chapter "Terms and Definitions" (see Chapter 3);

--- Change "principle" to "overview" (see Chapter 4, Chapter 3 of the 2008 edition);

--- Changed the material and description of the combustion device (see 5.1, 4.1 of the 2008 edition);

---Changed the description of the timing device (see 5.2, 4.2 of the 2008 edition);

--- Changed the inner diameter and flame requirements of the Bunsen burner (see 5.3, 4.3 of the 2008 edition);

--- Changed the contents of the fume hood (see 5.5, 4.5 of the 2008 edition);

--- Changed the gauge length on the scale in Figure 1 and Figure 4 (see Figure 1 and Figure 4, Figure 1 and Figure 4 of the 2008 edition);

--- Increased the diameter of the nail on the sample holder in Figure 2 (see Figure 2);

--- Deleted the gauge length on the left side of the sample (side view) inserted in the sample holder in Figure 3 (see Figure 3 of the 2008 edition);

---Changed the precision of specimen width and thickness (see 6.1, 5.1 of the 2008 edition);

--- Change the relevant content of "Sample" in the 2008 edition and include it in the "Test procedure" (see 6.1, 6.2 and 6.3, Chapter 5 of the 2008 edition and 6.1);

--- Changed the installation requirements for the aluminum foil on the inner wall of the chimney (see 6.7, 6.6 of the 2008 edition);

--- Changed the description of sample ignition (see 6.9 and 6.12, 6.8 and 6.10 of the 2008 edition);

--- Increased the number of samples for observing and recording burning drippings (see 6.11);

---Changed the letter symbols related to quality (see 7.1, 7.1 of the 2008 edition);

--- Changed the result representation (see 7.2, 7.2 of the 2008 edition);

--- Changed the content that the report should include (see Chapter 8, Chapter 8 of the 2008 edition).

1 Scope

This document describes the test method for rigid foamed plastics to determine the burning time, the height of the burning flame of the sample, and the percentage of residual mass.

This document applies to small-scale tests for evaluating the vertical burning behavior of rigid foamed plastics under laboratory conditions.

This document does not apply to materials that melt or drip during combustion.

This document is not suitable for assessing the fire hazard of materials under actual fire conditions, nor can it be used as an effective assessment of the fire hazard of materials. the only basis for.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2035 Plastic terms and their definitions

GB/T 2918 Standard environment for conditioning and testing of plastic specimens

GB/T 5907.1 Firefighting Vocabulary Part 1: General Terms

GB/T 6343 Determination of apparent density of foamed plastics and rubber

3 Terms and Definitions

The terms and definitions defined in GB/T 2035 and GB/T 5907.1 apply to this document.

4 Overview

Fix the sample vertically in a chimney with a glass observation window, ignite it with a Bunsen burner for 10s, and record the burning time and burning time of the sample. Flame height and residual mass percentage after combustion.

5 Instruments and equipment