ASTM F2878 Test Fikstürü

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ASTM F2878 – Standard Test Method for Protective Clothing Material Resistance to Hypodermic Needle Puncture

 

ASTM F2878 is used to determine the force required to cause a sharp-edged  hypodermic needle to penetrate through protective clothing material.

The standard describes three needles that may be used: 21-, 25-, or 28-gauge needles.

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ASTM F2878 / Significance and Use

This test method evaluates puncture resistance of protective clothing materials which may include: plastics or elastomeric films, coated fabrics, flexible materials,

laminates, leathers, or textile materials.

This test method uses hypodermic needles with specified dimensions as puncture probes.

This test method evaluates needle puncture resistance of protective clothing materials, perpendicular to the material’s surface and with no supporting structure

under/behind the material specimen.

Evaluation of puncture resistance for snag-type puncture should be performed in accordance with Test Method ASTM D2582.

Evaluation of puncture resistance for non-cutting puncture should be performed in accordance with Test Method ASTM F1342/ASTM F1342M.

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ASTM F2878 / Apparatus

Thickness Gauge, suitable for measuring thickness to the nearest 0.01 mm, as specified in Test Method D1777 shall be used to determine the thickness of each

protective clothing specimen tested.

Testing Machine, shall meet the following criteria:

The specimen holder shall be capable of holding the specimen securely between the two clamps plates.

A  penetrometer or material testing device shall be used that is capable of providing   load-versus-displacement data for facing surface contact through

needle penetration.

The error of the machine shall not exceed 1 % at any reading within its loading range.

It shall be outfitted with a load cell used in compression.

The testing machine may be configured with the load cell on the upper arm.

The load cell shall have a range sufficient to  measure the force necessary for needle penetration of the specimen.

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ASTM F2878 / Hypodermic Needle Puncture Probes General Description:

All probes shall be fabricated from 304 stainless steel with a Rockwell C Hardness of 35 to 40.

All probes shall be: three-facet, regular bevel, regular wall hypodermic needles.

Technicians may select from the following gauges:

28 gauge, 12.7-mm needle length

25 gauge, 25.4-mm needle length

21 gauge, 38.1-mm needle length

A total of twelve puncture probes, needles, selected from needle lots that have been validated, are required (one for each puncture measurement)

to conduct the test.

Specimen Support Assembly shall consist of two flat metal specimen support plates that clamp together so the sample specimen is held tightly between them.

Care should be taken to lay specimens the specimen flat in the assembly without distortion or tension on the specimen.

It shall also consist of a machine interface plate that can be connected to the testing machine.

*** Before conducting ASTM F2878 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.