Horizontal flammability tester test specimens and procedures

Horizontal flammability tester is used to detect the relative combustion rate and flame retardancy of textiles, especially automotive interior fabrics, and is a test equipment independently developed and produced by Shanghai Qianshi Precision Electromechanical Technology Co.
, Ltd.
, with high cost performance and complete
after-sales service.

Test principle: The specimen is clamped horizontally on the U-shaped bracket, and after igniting the free end of the specimen with a specified height flame in the combustion chamber for 15 seconds, determine whether the flame on the specimen is extinguished, or when it is extinguished, as well as the distance the specimen is burned and the time
it takes to burn the distance.

Test specimen: 1.
Shape and size Standard specimen shape and size
.

The thickness of the specimen is the thickness of the part, but not more than 13mm
.

When comparing combustion performance with different types of materials, specimens must have the same dimensions (length, width, thickness
).

Usually the specimen must have the same cross-section along the full length
of the specimen.

When the shape and size of the part are not sufficient to make a standard specimen of the specified size, the following small size specimens should be guaranteed, but should be recorded: a) If the width of the part is between 3mm and 60mm, the length should be at least 356mm
.

In this case, the specimen should be made as close as possible to the width
of the part.

b) If the part width is greater than 60mm, the length should be at least 138mm
.

At this point, the possible burn distance is equivalent to the distance from the reticle to the time the flame is extinguished or from the reticle to the end of the specimen
.

c) If the width of the part is between 3mm and 60mm, and the length is less than 356mm or the width of the part is greater than 60mm and the length is less than 138mm, it cannot be tested according to this standard; Specimens with a width of less than 3 mm cannot be tested according to this standard
.

2.
Sampling At least 5 specimens
should be removed from the test part.

If there are materials with different combustion rates in different directions, specimens should be intercepted in different directions and 5 (or more) specimens should be tested separately in combustion chambers
.

The sampling method is as follows: a) When the material is supplied at a full width, samples containing a full width and a length of at least 500 mm should be intercepted, and the material 100 mm away from the edge should be cut off, and then isometrically and evenly sampled
on the rest of the part.

b) If the shape and size of the part meet the sampling requirements, the specimen should be intercepted from the part
.

c) If the shape and size of the parts do not meet the sampling requirements, and must be tested according to this standard, the same material and process can be used to make a standard specimen (356mm×l00mm) consistent with the structure and parts, and the thickness of the parts is small and not more than 13mm for testing
.

The results of this test cannot be used for identification, certification, etc.
, and the sample preparation must be noted in the
test report.

d) If the thickness of the part is greater than 13mm, apply mechanical methods to cut from the non-exposed surface, so that the thickness of the specimen including the exposed surface is 13mm
.

e) If the thickness of the part is not uniform, apply mechanical methods to cut from the non-exposed surface, so that the thickness of the part is unified into a small part of the thickness
.

f) If the parts are bent and cannot be prepared to make a flat specimen, the flat part should be taken as much as possible, and the height of the specimen arch shall not exceed 13mm; If the height of the specimen arch exceeds 13mm, it is necessary to use the same material and process to make a standard specimen (356mm×l00mm) with the same structure and parts, and the thickness of the part is taken from the small thickness and must not exceed 13mm for testing
.

g) The laminated composite material should be treated as a single material for testing, and the sampling method is the same as above
.

h) If the material is made of several layers superimposed, but it is not a laminated composite material, it should be sampled separately from all layers of single material within 13 mm thickness from the exposure surface for testing, and the interface between material A and material B is not bonded, and material A is tested
separately.

Material B is within 13mm thickness and is tightly bound to material C, so materials B and C should be used as laminated composite materials and cut 13mm for testing
.

Test steps: 1.
Take out the pre-treated specimen, place the surface of the hairy or tufted specimen flat on the flat tabletop, and comb twice in the opposite direction of the villi on the hair-raising surface with a
metal comb in accordance with the provisions of 4.
2.
5.

2.
Light the gas lamp when the air inlet of the gas lamp is closed, and adjust the flame according to the flame height marker board so that the flame height is 38mm
.

Before starting the test, the flame should burn stably for at least 1 min in this state and then extinguish
.

3.
Load the specimen into the specimen holder
with the exposed face down.

Mount the specimen so that both sides and one end are clamped by the U-shaped bracket, and the free end is aligned
with the U-bracket opening.

When the specimen width is insufficient, the U-shaped bracket cannot clamp the specimen, or the free end of the specimen is soft and easy to bend, causing unstable combustion, the specimen is placed on the specimen holder with heat-resistant metal wire for combustion test
.

4.
Push the specimen holder into the combustion chamber, and the specimen is placed in the center of the combustion chamber and placed in a horizontal position
.

Light the gas lamp in the gas lamp air inlet closed state, and make the flame height 38mm, so that the free end of the specimen is ignited in flame for 15 seconds, and then extinguish the flame (close the gas lamp valve).
5.
The flame burns forward from the free end of the specimen, and the timing begins at the moment when the root of the flame is transmitted
through the reticle.

Pay attention to the flame propagation on the faster burning side, and the timing is based
on the side with the faster flame spread.

6.
When the flame reaches the second reticle or the flame reaches the second reticle before extinguishing, the chronograph is stopped at the same time, and the timing is also based on
the side where the flame propagates faster.

If the flame is extinguished before reaching the second reticle, the distance
from the reticle to the flame extinguished is measured.

The burn distance is the length
of the parts that have been burned on the surface or inside the specimen.

7.
If the non-exposed surface of the specimen is cut, the flame propagation speed of the exposed surface should be used as the timer
.

8.
The requirements of combustion speed do not apply to the surface
formed by cutting specimens.

9.
If the specimen burns slowly for a long time from the timer, the test can be aborted at 20min of the test timing, and the combustion time and combustion distance
can be recorded.