The Definitive Guide to ASTM D903, Peel or Stripping Strength of Adhesive Bonds

How to Perform a Peel or Strip Test on Adhesively-Bonded Materials

Written by Charlie Pryor

ASTM D903 is a common tensile test used to evaluate the peel or stripping characteristics of adhesively bonded materials used in a wide variety of applications in an even wider range of industries. Some examples of materials tested to ASTM D903 are plastic films, adhesive labels, and waterproofing materials. This guide is designed to introduce you to the basic elements of an ASTM D903 test and will provide an overview of the testing equipment, software, and specimens needed. However, anyone planning to conduct ASTM D903 testing should not consider this guide an adequate substitute for reading the full standard.

Challenges of ASTM D903 Testing:
  • Reporting calculations in compliance with the standard
  • Data rate adequate to capture peaks and troughs
  • How to grip materials of various thickness
  • Eliminating slippage during testing

 

ASTM D903
Why Perform ASTM D903 Testing?

Testing for ASTM D903 is mainly performed for research and development purposes. Due to the standard 7 day conditioning period required by this test, it is difficult to use this method as a quality control measure. In most instances, ASTM D903 testing is used to evaluate an isolate chemical composition for adhesives that yields the best adhesive properties.

Specimens and Specimen Conditioning

To perform a test to ASTM D903, the adhesive materials must be cut into specimens 1" x 12" long. The specimens are then peeled away from either a flexible or rigid substrate at a 180° angle at a separation rate of 152.4 mm/min, or 6in/min. Test materials must be thick enough to withstand the expected tensile pull but not greater than 3 mm (1⁄8 in.) in thickness. Wherever possible, the standard thickness of specimens is: metals, 1.6 mm (1/16 in.); plastics, 1/16 in; wood, 1/8 in; rubber compounds, 1.9 mm (0.075in.). If the flexible specimen is known to elongate when under load, it is important to use a more rigid substrate that is not expected to elongate under the same load. 

All samples will need to undergo conditioning prior to testing. Standard conditioning for ASTM D903 requires the specimen to be be exposed to a monitored humidity and temperature for 7 days. For some adhesives, the conditioning period may be less if deemed unnecessary for that material. Testing is to be completed as soon as possible after the specimen has left the conditioning environment.

ASTM D903 specimen placement
Test System

Due to the high data capture rate needed to record the peaks and troughs during testing, an Instron 6800 Series test frame with Bluehill Universal is recommended. 6800 Series frames have a maximum data capture rate up to 5 kHz. An ideal frame for testing adhesively bonded specimens is the 68SC-1 system. The 68SC-1 frame allows for adequate travel and has a maximum load capacity of 1 kN (225 lbs) which is appropriate for most ASTM D903 specimens. A higher capacity 6800 series test frame may be necessary if a specimen is expected to exceed this capacity. To simplify your testing, Bluehill Universal's Adhesives module comes pre-loaded with the ASTM D903 test method.

ASTM D903 Bluehill Universal
Gripping Options

Though advanced screw side action grips are the most common gripping solution for ASTM D903 testing, pneumatic side action grips are the preferred option for this type of testing. Pneumatic side action grips allow for a variable air pressure to be sent to the grips, whereas the advanced side action grips need to be manually tightened on each specimen. 

Both of these gripping solutions employ a patented "quick-change" jaw face design which enables operators to easily change jaw faces to accommodate the needs of their materials. The most commonly-used jaw faces are serrated, rubber, or smooth-faced, but the use of each greatly depends on the specimens being tested. Sometimes serrated jaw faces can be too aggressive and cause premature failure at the jaw faces, whereas sometimes rubber or smooth faces can allow the specimen to slip or extrude out.

2712-052
250 N モデル | 2712-052
2610-112
500 N モデル | 2710-112

この試験で得られる結果の種類

ASTM D903では、5つのピーク値とトラフ値の平均値における平均荷重と、総合的な剥離強度を測定します。また、試験中に発生した破壊の種類も、解析のために記録しておく必要があります。

ASTM D903 Bluehill Universal

試験を成功させるためのヒント

ASTM D903に準拠した接着剤の試験を行う際には、高いデータ取得率を維持することが重要です。データ取得率が低いとシステムが「鈍化」し、試験中のピーク値とトラフ値を見逃してしまい、結果として平均強度値が低くなってしまう可能性があるからです。インストロンの6800シリーズシステムのデータ速度は5 kHzと高速なので、可能な限り多くのデータを取り込み、精度の高い計算を行えます。

厚い基板に薄い被着体を試験する場合、グリップに試験片を置くと、ロードストリングにオフセットが発生することがあります。高性能ねじ式グリップを使用するとフェースを調整することができ、被着体のオフセットを調整して試験片の位置ずれを防ぐことができます。


Test Setup
1) Grips
2) Alignment Plate
3) Rigid Substrate
4) Specimen

 

ASTM D903 specimen placement

6800 シリーズプレミアム試験機のカタログ

インストロン6800シリーズ万能試験機は、他に類のない精度と信頼性を提供します。特許申請中のオペレーター保護機能に基づき、最新のスマートクローズエアキットおよび衝突緩和機能を搭載した6800シリーズは、材料試験をかつてないほどシンプルに、スマートに、安全にします。

3400シリーズ – お手頃な試験ソリューション

引張、圧縮、曲げ、およびその他の材料特性を試験する、インストロン3400シリーズ万能試験機。

Bluehill Universalの

Bluehill Universalソフトウェアは、タッチ操作と直感的なユーザー体験のために構築されています。あらかじめ備わっている試験メソッド、すぐに試験が開始できるQuickTest、強化されたデータ出力機能、そしてサービスとの直接通信を提供する新機能Instron Connectなど、よりシンプルでスマートな試験をご体感ください。 Bluehill 2やBluehill 3などの旧バージョンソフトは、簡単に最新バージョンのBluehillにアップグレードできます。

2712-04Xシリーズ空気圧式グリップ

空気圧式グリップは、広範囲の材料に対応する多用途なグリップ機能を提供します。容量は1~10 kNです。

2710シリーズ ねじ式グリップ

ねじ式グリップは、試験片をつかむための簡単かつ効果的な方法を提供し、広範囲のアプリケーションに使用できます。