Set the Tester
Readings within 10–90% of full scale; speed 300 ± 10 mm/min.
2009年創業のニット生地メーカー · 中国
試験方法 · GB/T 19976 · ISO 13938-1
ニット生地の破裂強度
破裂強度は、鋼球やダイヤフラムがニット生地を突き破るまでに生地が耐える力を示します。当社では鋼球法（GB/T 19976、ASTM D6797に類似）で試験を実施しています。欧州の仕様書では油圧式のISO 13938-1が引用されることが多くあります。
試験片は量産ロットから採取します。
当社の方法
GB/T 19976 鋼球法
米国における同等規格
ASTM D6797 / D3786
単位
N（鋼球法）· kPa（油圧法）
01
What This Test Measures
Knits stretch in every direction, so a bursting test, which pushes against the fabric from one side like an elbow or knee, describes how they fail in use.
Ball methods (GB/T 19976, ASTM D6797) report force in newtons; diaphragm methods (ISO 13938-1 hydraulic, ASTM D3786) report pressure in kilopascals. The two cannot be converted.
02
How We Run It in Our Lab
Our technicians follow a written work instruction for this method.
Our lab runs the steel ball method; hydraulic testing is arranged with third-party labs when an order requires it.
Choose the Ball
A 25 mm or 38 mm polished steel ball, as agreed.
Clamp and Burst
The specimen is clamped flat, back facing the ball, and burst.
Report
Peak force in newtons; mean of at least five specimens.
03
Test Conditions
Key settings. Write the method and procedure in your specification.
| Parameter | Setting |
|---|---|
| Method | GB/T 19976-2005, steel ball |
| Ball | 25 or 38 mm |
| Speed | 300 ± 10 mm/min |
| Specimens | At least 5 |
| Equivalent methods | ASTM D6797 / D3786 (US) · GB/T 19976 (China). Compare methods → |
04
Results for Your Order
Ask us for results for the selected fabric, shade and test conditions. Acceptance values for your order are agreed in writing.
05
Writing This Test into Your Specification
Match Method and Unit
Newtons belong to ball methods; kilopascals to diaphragm methods.
Bursting, Not Tearing
Some templates call ISO 13938 “tear resistance”. It is a bursting test.
State the Ball Size
For ball methods, state 25 mm or 38 mm.
06
Questions About GB/T 19976 · ISO 13938-1
Is ISO 13938 a tear test?
No. ISO 13938-1 and -2 are bursting tests with a hydraulic or pneumatic diaphragm. Tear tests such as ISO 13937 are mainly for woven fabrics.
Can I convert newtons from a ball burst test into kPa?
No. The methods load the fabric differently, so there is no reliable conversion.
Why test knits for bursting rather than tensile strength?
Knits stretch in all directions and fail under multi-directional load; a bursting test reproduces that load.