ASTM D1708 is a standardized test method to determine the tensile properties of plastic microtensile specimens. The tensile properties reported are yield stress, yield strain, tensile strength, break stress, and break strain. Modulus of elasticity shall not be determined when using D1708’s microtensile specimen.


ASTM D1708 microplastic tensile testing

plastics hub icon 

ASTM D1708 is recommended for labs that have a historical material property data that was obtained through D1708 testing. If no such historical data exists, it is recommended to refer to ASTM D638 or ASTM D882. If material is limited for testing purposes, ASTM D638’s Type V specimen is similar in size to the microtensile specimen defined in D1708.

Plastic manufacturers must design plastic to meet the requirements of the end application. Whether they are supplying plastic to produce biomedical devices, bicycle helmets, or children toys, each application has specific strength requirements in addition to safety, weight, environmental resistance, and other requirements. Determining the tensile properties of a polymer provides useful strength and deformation data for the plastics engineering process. It is worth noting that the properties of plastics have a high sensitivity to the rate which rate they are pulled (tension) or pushed (compression). It is important to recognize this sensitivity as properties experienced in the end application can differ from those observed during a controlled test. For this reason, ASTM D1708 and other plastics testing standards are generally used for quality control in a production setting or for comparative purposes in a R&D setting.

Materials Testing System

As typical forces will not exceed 1 kN (225 lbf) and displacements will not exceed 2 inches (50 mm), we recommend a low force single column test frame such as those found in Instron's 3400 and 6800 series.

ASTM D1708 Test Setup
6800 Series Universal Testing System
Bluehill Universal Software
2580 Series Load Cell
2702-041 Pneumatic Side Action Grips


ASTM D1708 plastic tensile testing

Due to the low forces involved, 250 N pneumatic side action grips (2712-052) or 1 kN manual wedge grips (2716-016) should be sufficient for most ASTM D1708 testing.

250 N Model | 2712-052
2 kN Model | 2716-017
Tips and Tricks 
  • Gripping can be a challenge when testing subsized specimens. ASTM D1708 allows a minimum specimen shoulder length (the region of the specimen that is gripped) of 8 mm, which can cause difficulties due to insufficient specimen insertion into the grip’s jaw face. When insufficient specimen insertion exists, it is recommended to use grips that do not allow jaw face pivot as it can cause unwanted stress concentrations along the specimen. With sufficient specimen insertion, Instron recommends its 250 N capacity pneumatic side-action grips (2712-052) with serrated jaw faces. With insufficient jaw face insertion, Instron’s 1 kN capacity, manual wedge action grips (2716-016) are recommended.
  • Due to their small size, microtensile specimens can increase the chances of a pinch hazard when operators clamp the specimen with pneumatic grips. Instron’s 3400 and 6800 frames have an optional Smart-Close Air Kit that is fully integrated into the frame and software. The Smart-Close Air Kit minimizes pinch hazards by closing the jaw faces at a reduced speed and pressure during installation. When the test is ready to begin full pressure is applied, and the test routine starts.
Related Content

Broschüre Serie 6800 Premier Testing Systems

Universal-Testsysteme der Instron Serie 6800 bieten unvergleichliche Genauigkeit und Zuverlässigkeit. Die 6800 Serie basiert auf einer zum Patent angemeldeten Operator-Protect-Systemarchitektur mit einem brandneuen Smart-Close Air Kit und Collision-Mitigation-Funktionen, wodurch Materialtests einfacher, intelligenter und sicherer sind als je zuvor.

Serie 3400 – Erschwingliche Testlösungen

Instron Serie 3400 Universal-Testsysteme für Zug, Kompression, Biegung und andere Materialeigenschaften-Tests.

Broschüre Bluehill Universal

Bluehill Universal wurde von Grund auf für haptische Interaktion und eine intuitive Benutzererfahrung ausgelegt. Entdecken Sie einfacheres und schnelleres Prüfen mit Funktionen wie vorgeladene Prüfmethoden, QuickTest in Sekunden, verbessertem Datenexport und Instron Connect, einer neuen Funktion, die eine direkte Verbindung zum Service bereitstellt. Benutzer früherer Versionen von Software wie Bluehill 2 und Bluehill 3 können leicht auf die neueste Version von Bluehill aufrüsten.

2712-05x Serie – Seitlich wirkende, pneumatische Spannzeuge

Seitlich wirkende, pneumatische Spannzeuge sind eine vielseitige Lösung zum Einspannen vieler Materialien. Bewertete Kapazitäten bis zu 250 N.

2716-01x, 2716-02x und 2736-01x Manuelles Keilspannzeug

Das manuelle Keilspannzeug von Instron ist für einfache Probenladung, Ausrichtung und Positionierung konzipiert. Nach dem ersten Kontakt mit der Probe wird die Kraft vergrößert, während die Prüflast erhöht wird. Bewertete Kapazitäten bis zu 50 kN.