波紋管阻(zu)燃檢(jian)測方法(fa)及標準

波紋管的阻(zu)燃(ran)性能(neng)(neng)是其安全性能(neng)(neng)的重要指(zhi)標(biao)，尤其適用于(yu)汽車、建筑(zhu)、電(dian)力等(deng)對(dui)防(fang)火要求較高的領域。以下是常見的阻(zu)燃(ran)檢(jian)測方法及依據標(biao)準：

一、主要(yao)參考標準

阻燃(ran)檢測(ce)需遵循行業或(huo)客戶(hu)指定的標準，常(chang)見的有：

• UL 94 V0：美國保險商(shang)實驗室（UL）制定的(de)塑料材料燃燒性能(neng)標準(zhun)，是(shi)波紋管阻燃檢測的(de)常用標準(zhun)；

• MVSS 302：美國機動車安全標(biao)準(zhun)，適用于(yu)汽車內飾及排氣系統波紋管(guan)的燃燒性能要求；

• QC/T 413-2002：中國(guo)汽車(che)行業(ye)標準，規定(ding)了汽車(che)用波紋(wen)管(guan)的阻燃試驗方法（如4.10.2條(tiao)）；

• GB/T 2408：中國(guo)國(guo)家標準《塑料燃燒(shao)性(xing)能的測(ce)定 水平法(fa)和垂直法(fa)》，部(bu)分場景(jing)也會參(can)考此標準。

二、具體檢測方法(fa)（以UL 94 V0為例）

UL 94 V0采用垂直燃燒試驗，步驟如下：

1. 試樣(yang)準備：取長度(du)(du)(du)125mm、寬度(du)(du)(du)13mm、厚度(du)(du)(du)（不(bu)超(chao)過13mm）的(de)波紋管試(shi)樣(yang)，垂直固定(ding)在試(shi)驗架上(shang)；

2. 火(huo)焰點燃：使(shi)用本(ben)生燈（火焰高度125mm，藍色內焰高度40mm），對(dui)準試樣(yang)頂端10mm處點燃(ran)10秒，然后移開(kai)火焰；

3. 燃燒時間記錄：移開火焰后，記錄試樣的持續燃燒時(shi)間（需≤10秒）；

4. 二次點燃：若試樣在第一次燃燒后未熄滅，再次用火焰點燃10秒，移開后記錄第二次持續燃燒時(shi)間（仍需≤10秒）；

5. 滴(di)落物(wu)檢查：試驗過程中，試樣不得有熔融滴落物引燃下方300mm處的(de)棉花（避免火(huo)勢蔓延）。

三、結果判定

符合UL 94 V0標準的(de)波(bo)紋管(guan)需滿足：

• 兩次點燃(ran)后的總燃(ran)燒時間(jian)≤20秒；

• 無滴落物引燃棉花；

• 試(shi)樣(yang)燃燒后未完全(quan)燒盡（殘(can)留長度≥50mm，或燒至夾具處停止）。

四、檢測(ce)儀(yi)器

• 燃(ran)燒試驗機(ji)：用于模(mo)擬火(huo)焰環境，控制火(huo)焰高度(du)、點燃時間等參數；

• 計(ji)時(shi)設備：精確記錄燃燒時間；

• 棉花(hua)墊(dian)：放(fang)置在試樣下方，檢(jian)測滴落物的(de)引(yin)燃性。

備注(zhu)

實際檢測中，需根據波紋管的應用(yong)場景（如汽車、建筑、電力）選擇對應標準（如MVSS 302適用于汽車，UL 94 V0適用于通用塑料），并以客戶指定的實驗方法為準。例如，汽車排氣系統波紋管可能額外要求高溫(wen)下的(de)阻燃(ran)性能（如(ru)100℃以上環境中(zhong)的燃燒(shao)測試(shi)），需結合(he)(he)熱老化試(shi)驗(yan)綜合(he)(he)評估。

通過上述(shu)方法檢測，可確保波紋管(guan)在(zai)火災場景下(xia)的安全性，防止火勢(shi)擴散。

Flame retardancy testing methods and standards for corrugated pipes

The flame retardancy of corrugated pipes is an important indicator of their safety performance, especially suitable for industries with high fire protection requirements such as automotive, construction, and power. The following are common flame retardancy testing methods and the corresponding standards:

I. Main reference standards
Flame retardancy testing should follow industry - specified or customer - specified standards. Common ones are:

UL 94 V0: A standard for the flammability of plastic materials established by Underwriters Laboratories (UL) in the United States, which is a commonly used standard for the flame retardancy testing of corrugated pipes.
MVSS 302: A motor vehicle safety standard in the United States, applicable to the flammability requirements of corrugated pipes in automotive interiors and exhaust systems.
QC/T 413 - 2002: A standard in the Chinese automotive industry, which stipulates the flame retardancy test methods for automotive corrugated pipes (e.g., Article 4.10.2).
GB/T 2408: A Chinese national standard ";Determination of burning behavior of plastics - Horizontal and vertical test methods", which may also be referred to in some scenarios.

II. Specific testing methods (taking UL 94 V0 as an example)
UL 94 V0 uses a vertical burning test, and the steps are as follows:

Sample preparation: Take a corrugated pipe sample with a length of 125mm, a width of 13mm, and a thickness (not exceeding 13mm), and vertically fix it on the test rack.
Flame ignition: Use a Bunsen burner (flame height 125mm, blue inner flame height 40mm) to ignite the sample at a point 10mm from the top for 10 seconds, and then remove the flame.
Combustion time recording: After removing the flame, record the continuous burning time of the sample (which should be ≤ 10 seconds).
Second ignition: If the sample does not go out after the first burning, ignite it again with the flame for 10 seconds. After removing the flame, record the second continuous burning time (which still should be ≤ 10 seconds).
Dripping inspection: During the test, the sample should not have molten drips that can ignite the cotton placed 300mm below (to avoid the spread of fire).

III. Result judgment
Corrugated pipes that meet the UL 94 V0 standard should meet the following requirements:

The total burning time after two ignitions should be ≤ 20 seconds.
There should be no drips that can ignite the cotton.
The sample should not be completely burned out after combustion (the remaining length should be ≥ 50mm, or the burning should stop at the clamp).

IV. Testing instruments
Burning test machine: Used to simulate the flame environment and control parameters such as flame height and ignition time.
Timing device: Used to accurately record the burning time.
Cotton pad: Placed below the sample to detect the ignitability of drips.

Remarks
In actual testing, the corresponding standards should be selected according to the application scenarios of the corrugated pipes (e.g., MVSS 302 for automotive, UL 94 V0 for general plastics), and the experimental methods specified by the customer should be followed. For example, corrugated pipes in automotive exhaust systems may have additional requirements for flame retardancy at high temperatures (such as a burning test in an environment above 100℃), and a comprehensive evaluation should be carried out in combination with thermal aging tests.

Through the above - mentioned testing methods, the safety of corrugated pipes in fire scenarios can be ensured, and the spread of fire can be prevented.