ISO 8295


ISO 8295 Coefficient of Friction Plastic Film and Sheeting


ISO 8295 is a standardized test method used for determining static (μ_s ) and kinetic (μ_k ) coefficients of friction of plastic film and sheeting. Plastic film is a widely used material in the packaging industry. Within the packaging industry the use of film can be separated into two categories: food packaging such as produce bags, carton liners, or meat seal wrap, and non-food packaging such as envelope liners or potting soil sacks. Outside of the packaging industry, plastic films are used for an assortment of products: trash bags, can liners, I.V. bags, construction liners, and other barriers. Thin films are also an important component of electric vehicle batteries, which is an industry predicted to experience explosive growth over the course of the next decade. The frictional properties of these films must be characterized and controlled to ensure the safety and functionality of the end product.

 


 


Separator Film Testing for Electric Vehicle Batteries

Separator films for electric vehicle batteries are being produced in increasingly high volumes and must undergo frictional testing as part of a robust material characterization process. These films are used to separate the anode and cathode in lithium-ion and other liquid electrolyte batteries, and are extremely critical to product safety. The most common material used for separator film is polyolefin, a polymer film that is strong enough to withstand the winding operation during assembly as well as uneven plating of lithium on the anode due to extensive use. Safer and stronger separator material more effectively prevents contact between the anode and cathode, while thinner material helps reduce the weight of each battery and improve energy density. Understanding the frictional properties of this polymer film can help ensure the material is being wound properly during assembly and will behave as expected under extensive use. Testing standards specific to electric vehicle batteries have not yet been established, so ISO 8295 is commonly used as a proxy standard to characterize the frictional properties of these materials.

Learn More About Electric Vehicle Battery Testing

electric vehicle chassis
Materials Testing System

Instron’s 6800 series frames are capable of data capture up to 5 kHz to ensure that all fast-changing test events are captured. Too low of a data capture rate may lead to missed force peaks and troughs, resulting in an inaccurate average strength value. For ISO 8295 testing we recommend a 6800 series single column frame equipped with a low force (5 – 100 N) 2530 series load cell depending on the expected frictional forces. This test requires the use of Instron's 2810-005 Coefficient of Friction fixture, which is specifically designed to meet the requirements of ISO 8295 and ASTM D1895.


ISO 8295 Test Setup
1) 6800 Series Universal Testing System
2) Bluehill Universal Software
3) 2530 Series Load Cell
4) 2810-005 Coefficient of Friction Fixture

 

ISO 8295 coefficient of friction thin films and sheeting
How to Perform a Test to ISO 8295

The ISO 8295 test method is used to investigate the static and dynamic frictional properties of film and sheet plastics when sliding against either itself or another material. This method is intended to be used for non-sticky plastic film and sheeting of up to 0.5 mm in thickness. To perform this test, the specimen is supported on a friction table consisting of a horizontal test table, a sled, and a driving mechanism which uses a pully to produce a relative motion between the sled and the test table. One piece of the specimen is attached to the table with double-sided adhesive tape while the other piece is secured to the sled in the same way. The test machine then drags the sled across the table at a constant rate of displacement, causing friction between the two pieces of material. The force is recorded, and test results are calculated. As always we suggest reviewing the full ISO 8295 standard to fully understand the testing requirements.

Tips and Tricks 

Instron’s 6800 controller can accurately measure forces down to 0.1% (1/1000th) of the 2580 series load cell's capacity, enabling the measurement of very low forces, potentially eliminating the need for multiple load cells. The lowest capacity 2580 series load cell is 500 N, meaning that it can maintain 1% accuracy from 0.5 N to 500 N. Instron’s 2530 series load cells can maintain 1% accuracy down to 1/250th of the cell’s capacity when used on a 6800 frame. The lowest capacity 2530 series load cell is 5 N, meaning it can maintain 1% accuracy from 0.02 N to 5 N. Forces beneath the lower limits of the 2580 and 2530 series cells can be measured, but Instron cannot guarantee 1% accuracy.

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6800 系列高级测试系统宣传册

Instron 6800 系列通用测试系统可提供无与伦比的准确性和可靠性。6800 系列以专利申请中的操作员保障系统架构为依托,架构采用全新的 Smart-Close 空气套件并具有碰撞缓解功能,使得材料测试比以往任何时候都更简单、更智能、更安全。

Bluehill Universal 宣传册

Bluehill Universal 软件从头开始构建,旨在提供触摸互动和直观的用户体验。使用诸如预装测试方法、几秒钟内快速测试、增强的数据导出以及 Instron Connect(一种全新功能,可提供与服务的直接通信联系)等功能,发现更简单、更智能的测试。 Bluehill 2 和 Bluehill 3 等以前版本软件的用户可以轻松升级到最新版本的 Bluehill。

2530 系列低力载荷传感器

Instron 2530 系列载荷传感器经过专门设计,可与任何 Instron 的低力测试系统搭配使用。 力容量范围从 ±5 N 到 ±100 N(0.5 – 10 kgf、1.12 – 22.5 lbf),测量范围宽,可测量低至载荷传感器力容量 1/500 的力。

2580 系列载荷传感器

Instron 2580 系列载荷传感器经过专门设计,可与 5900 和 6800 系列测试系统搭配使用;性能卓越,能够测量低至力容量 1/1000 的力,精度为读数的 0.5%。

2810-005 摩擦系数工装

Instron 的 2810-005 摩擦系数工装使用 ASTM D1894 或 ISO 8295 标准测量塑料薄膜和塑料板的静摩擦系数和动摩擦系数。




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