What’s the differences between ISTA 3E and ISTA 3H?

What’s the differences between ISTA 3E and ISTA 3H?


Test Procedure 3H is a general simulation test for mechanically handled bulk loads.

 

Test Procedure 3H covers testing of bulk loads made up of one transport container or system consisting of the same product that because of their size and/or weight must be handled by mechanical means, for example, automotive parts in reusable racks.

The shipper shall determine the following prior to testing:

 

We can see clearly the different requirements between ISTA 3E and 3H from following chart:

Test Category

Test Type

ISTA 3H

ISTA 3E

Note

Atmospheric

Preconditioning

Temperature and Humidity

Ambient

Required

Atmospheric

Conditioning

Controlled Temperature and   Humidity

Temperature and Humidity

chosen from chart

Optional

 

Shock

Horizontal Impact

4 and 6 mph (1.8 and 2.7 m/s)300 ms Trapezoidal

/

Required for Rail

Shipments Only

2 mph (0.9 m/s)15ms

half sine

1.2m/s

Required

Inclined Impact (for ISTA 3E, select either horizontal or inclined shock)

1.2m/s

/

Rotational Flat Drop

4 in (100 mm)

8 in (200 mm)

Required

Rotational Edge Drop

4 in (100 mm)

8 in (200 mm)

Required

Vibration

Random

Overall Grms level varies with  Mode of Transport, max. 82.58 mm P-P displacement

0.54Grms, 45.13mm P-P displacement

Required

Compression

(Alternative methods allowed -   select one test type)

Machine Apply and Release

Calculated Test Force x1.4

Optional

Required

Machine Apply and Hold

Calculated Test Force x

Weight and load Spreader

Calculated Test Force x


Steel Spring Truck Random Vibration is same with ISTA 3E, additionally, there are another two types vibration test:

1. For Air-Ride Truck Random Vibration:

The following breakpoints shall be programmed into the vibration controller to produce the acceleration versus frequency profile(spectrum) below with an overall Grms level of 0.28. The theoretical stroke required to run this vibration profile is 82.58 mm (3.251in) peak to peak.

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2. For Railcar Random Vibration:

The following breakpoints shall be programmed into the vibration controller to produce the acceleration versus frequency profile(spectrum) below with an overall Grms level of 0.13. The theoretical stroke required to run this vibration profile is 21.26 mm (0.837in) peak to peak.

161889884061163614.png


Calculate the test time

Estimate the transportation distance of the package during land transportation, and then use the following formula to determine the test time:

Test time (minutes) = transportation distance (miles) ÷ 5. The longest test time is 240 minutes

or

Test time (minutes)=transportation distance (km) |÷8. The longest test time is 240 minutes

For example:

If the estimated transportation distance is 750 miles, the test time is 150 minutes. If the estimated transportation distance is 1000 kilometers, the test time is 125 minutes.

 

Choose suitable product to do random vibration test

If customer wants to do test under both ISTA 3E and 3H procedures, then CME KRD70 series hydraulic vibration shakeris the best choice, which can cover all test specifications above, especially for large displacement 82.58 mm; while the normal electronic-dynamic shaker is difficult to meet long stroke and low frequency test, hydraulic shaker is the proper one to do these tests.

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KRD70 series hydraulic vibration shaker

Besides, CME Technology provides other test equipment, as KRD12 Horizontal shock Test System, KRD100 inclined Impact tester, KRD40 Drop Tester, KRD101 Compression Tester......All these mechanical testing systems is capable of doing above ISTA certification.

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Have any enquiry? Please contact our sales: [email protected] .


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