ASTM D3354 Blocking Load of Plastic Film by Parallel Plate Method

0 0

ASTM D3354 characterizes the degree of blocking (or unwanted adhesion) between layers of plastic film.

Why Is ASTM D3354 Useful?

Blocking develops in film processing and storage. It occurs when layers of smooth film are in intimate contact with nearly complete exclusion of air. Both temperature and pressure can change the adhesion of the surfaces. ASTM D3354 processes simulate the operation of separating film in some applications.

ASTM D3354 Test Method

Film to film adhesion is measured as a blocking load (grams), that causes two layers of film with a consistent area of contact of 10000 mm2 (15.5 in2)  to separate. ASTM D3354 is limited to a maximum load of 200 g (0.44 lbs).

Two pieces of film, which are in contact with each other, are placed between two 100 mm (4 in) square blocks, or test fixtures. The ends of the films that extend past the blocks are secured to the respective upper and lower block. The force required to overcome the adhesion (blocking force) between the two pieces of film or until they reach 19 mm (0.75 in) of separation is measured in grams using a universal test machine.

What Test Machines Are Recommended for Testing Plastic?

Our universal test machines serve multiple plastic testing applications and are capable of performing virtually all quasi static tension/compression tests, such as tensile, peel, and adhesion. Our machines feature both a uniform constant rate of extension separation (or CRE) or a constant rate of load (CRL) e.g. 90 g/min (0.02 lbs/min) with a low force load cell. The force measurement complies with ASTM E4.

CRE constant test speed mode requirements are 5.1 mm/min (0.2 in/min) 
CLR constant loading rate mode requirements are 90 g/min (0.02 lbs/min)

What Test Fixture Is Recommended for ASTM D3354?

Our GD3354 fixture consists of parallel block faces that are square and 100 mm  (3.9 in) on each edge with a flat and slightly knurled or sandblasted finish. The blocks are prevented from sliding when they are in contact during loading.