With packages over 150 lb (68 kg), choosing the right test procedure often boils down to a single question: “1B or 1D?”. But Series 1 has a third option that is rarely mentioned — use vibrate randomly instead of fixed displacement vibration. That is ISTA 1H.
This article analyzes the ISTA 1H in a self-locating standard way: what it tests, how it differs from the 1B/1D, and when choosing random vibrations actually creates value for heavy loads.
1. What is ISTA 1H?
ISTA 1H is a standard testing procedure Series 1 — Non-Simulation Integrity Performance Test, applies to individual packages weighing more than 150 lb (68 kg) when prepared for shipping.
Full name in document: Packaged-Products Over 150 lb (68 kg) (Random Vibration) — the word “Random Vibration” is what distinguishes 1H from 1B.
With 1H, the following three things determine how the result is read:
- 1H Durability tested, not simulated actual routes — do not use the results to infer failure rates on a particular route.
- 1H No default response carrier’s packaging regulations; these are two different things.
- With heavy goods, the object being assessed is tightly attached How to fix goods on pallets or skids — Changing the way of tying means changing the test object.
Something to remember right from the scope section: document 1H clearly states For unitized loads, ISTA 1E must be used — do not use 1H. Definition of unitized load: one or more products/packages usually located on skids or pallets, but always fixed or bound to circulate as a single block.
Current version: ISTA 1H 2014 (latest technical change March 2014, editorial change January 2016).
2. Most common misunderstanding about ISTA 1H
- “Heavy goods are only 1B or 1D.” — Missing. Series 1 has three optiones for goods over 68 kg: 1B (basic lesson, fixed displacement vibration), 1D (expanded article, with compressed categories) and 1H (random vibration). Which option to choose depends on the type of stimulation and goals you need.
- “1H is a cruise simulation for heavy cargo.” — No. 1H is still Non-Simulation Integrity: it does not recreate the itinerary, does not model shipping routes, and does not automatically comply with carrier regulations.
- “For heavy goods packed on pallets, try 1H.” — Not enough. If the goods have been fixed into a block to circulate as a unit, the correct procedure is ISTA 1E. 1H is for each individual package.
3. What does ISTA 1H test? — 4-step sequence
| Step | Test item | Select method | Required |
|---|---|---|---|
| 1 | Atmospheric preconditioning | Ambient temperature and humidity | Required |
| 2 | Vibration | Random vibration only | Required |
| 3 | Shock | Choose 1: drop or incline impact or horizontal impact | Required |
| 4 | Shock | Rotational Edge Drop | Required when no try face 1 |
The specific test level of each item (Grms level, drop height, impact velocity) is specified by the standard in the lookup table — please refer to the original document when doing so.
Step 1 — Atmospheric conditioning
The package is brought to ambient temperature/humidity conditions before entering the test sequence. With heavy goods, this is a step that takes considerable time because large volumes of goods take longer to reach heat-humidity balance.
Step 2 — Random vibration
The package is randomly vibrated according to the specified total Grms level. For heavy goods, this is both the most rigorous test and the most equipment-consuming test: the vibration system must have enough load and enough spectrum control ability.
Regarding practical value: heavy structures (machine frames, electrical cabinets, equipment with stands) often have low natural frequencies, located exactly in the range where random vibration excites the most. That’s why 1H can detect problems that an conditioning cannot detect.
Step 3 — Shock (impact)
Choose one of three methods: drop. drop, incline impact or horizontal impact. For heavy loads, incline impact and horizontal impact are often chosen more because it is difficult to create a safe and repeatable free-fall position.
Step 4 — Rotational Edge Drop
Required when not testing side 1 of the package. This test simulates the exact type of “tip/fall around the edges” that occurs when heavy loads are pushed, dragged, or pushed off the lifting platform. For goods over 68 kg, this is often the item that causes the most obvious packaging damage.
4. Accompanying equipment and method standards
| Test item | Equipment | Method reference |
|---|---|---|
| Random vibration | Random vibration system | ASTM D4728 |
| Drop test | Free-fall drop tester | ASTM D5276 |
| Vertical shock | Vertical shock tester | ASTM D5487 |
| Incline impact | Conbur table (incline impact tester) | ASTM D880 |
| Horizontal impact | Horizontal impact test system | ASTM D4003 |
| Rotational Edge Drop | Rotational edge drop test system | ASTM D6179 |
Compared to 1B/1D, the difference lies in step 2: 1B and 1D use a vibrating table fixed displacement (with metal shim and frequency meter), 1H remaining needed random vibration system with spectrum control — equipment is more expensive and fewer labs have it.
5. Sample number and sample preparation
With 1H, sample quantity requirements still follow the general regulations of Series 1 (Minimum 1 sample; ISTA 5 or more repetitions recommended with a new sample each time), but the cost of performing each iteration is much higher than the processes for light bales. The reason lies in three things that only goods over 68 kg (150 lb) have: sample transportation, sample loading and unloading, and accuracy when declaring configuration.
- Finalize the sample transportation plan in advance: Heavy samples often have to be rented, lashed and loaded with lifting equipment. A misaligned load on the way to the lab means the sample has already been “tested” before entering the test chamber.
- Confirm the lab has appropriate lifting equipment and access (warehouse door, floor, forklift or pallet jack) as soon as you schedule, don’t wait until the day the goods arrive to ask.
- Declare correct configuration and load center: weight, size, center of gravity position, way to fix goods on pallet or skid. A misaligned load center changes the way the load reacts to vibration and tilt — the lab needs to know this to position the sample correctly.
- Unify the safe standing area: samples of several hundred kilograms when falling or falling over is a dangerous situation; need to pre-fix who is where during the test.
- Repackage: sample must be Excessive packaging during shipping or Repackage in new packaging at the lab. With heavy goods, repackaging at a lab is often the cleaner option for both parties.
Because each iteration is costly, many businesses only try it once with heavy goods. That method is acceptable, but the report needs to be clear number of times performed, and should be agreed in advance with the end customer so that the results of one test are not interpreted as representative of the whole batch. The criteria for passing or failing are still determined in advance by the business: see 4 criteria businesses must determine for themselves before testing.
6. When should you not use ISTA 1H?
1H is not suitable in the following cases — often because the test subject or goal is different:
| Your situation | Should switch |
|---|---|
| Want to use vibration fixed displacement instead of random vibration | 1B |
| Need to add compression item to verify stacking ability | 1D |
| Goods have been unitized into whole units | 1E (or 3E if simulation is needed) |
| Packages up to 68 kg (150 lb) only | 1A · 1C · 1G |
| The goal is to simulate heavy cargo traveling internationally | 2B |
| It is necessary to forecast risks according to specific cargo routes | Series 3 group (3B, 3E…) |
7. Common errors when performing ISTA 1H
- Use 1H for rows fixed into blocks. Document 1H clearly states: unitized load must use 1E. Testing 1H for a pallet of wrapped goods is technically correct but on the wrong subject.
- Expect 1H to replace 1D. The two processes differ in vibration type and compression item; Data are not interchangeable.
- Skip the Rotational Edge Drop step. This step is required if you don’t try side 1 — skipping it will be in the wrong order.
- Does not control the actual volume of the sample. With heavy goods, the error of a few kilograms and the difference in center of gravity distribution significantly change the impact posture.
- Do not finalize damage criteria before testing. Heavy goods are often only dented/cracked locally — if not fixed in advance, the “pass/fail” conclusion will depend on emotions.
8. What does the cost and time of the ISTA 1H test depend on?
1H is a card that combines two expensive conditions: Packages over 68 kg (150 lb) and vibrate randomly, including edge impact category. Costs therefore have three separate items: lifting equipment and loading and unloading labor in both the factory and the laboratory; random vibrating table with enough load; and shipping samples — with heavy goods, the last item often takes the largest share of the quote.
Because the cost per iteration is high, many businesses only try it once. That method is acceptable as long as the report clearly states the number of times it has been done and both parties agree in advance. Summary of common factors: What does the cost and time of ISTA packaging testing depend on?
9. Frequently asked questions
How is ISTA 1H different from ISTA 1B?
Same weight group (over 150 lb / 68 kg), but different vibration type: 1B uses fixed vibration, 1H uses random vibration. Both have a Rotational Edge Drop step.
How is ISTA 1H different from ISTA 1D?
1D is card extend For goods over 68 kg: there are additional items compression conditioning and allows random vibration selection. 1H has no compression item — in return, 1H is fixed on the random vibration option. If your target has compression/stacking sections, 1D is the right choice.
Does ISTA 1H have a compression item?
Are not. Sequence 1H consists of atmospheric conditioning → random vibration → shock → rotational edge drop. There are no compression categories.
Should a 90 kg package be placed on a pallet, use 1H or 1E?
The decisive question is: the goods are obtained fixed/bound to circulate as a single block? If there is (wrapping film, tightening belt, tray + lid, goods linked to pallet), it is unitized load → use 1E, and the 1H document clearly states not to use 1H for this case. If it is still an individual package, 1H (or 1B/1D) is the correct group.
How is ISTA 1H different from ISTA 2B and 3E?
1H is Non-Simulated Integrity: only challenges endurance, does not simulate travel. 2B is Partial Simulation for heavy goods with international distribution. 3E is General Simulation for whole unit loads on a full-truckload trip. If you need to predict the risk of damage along the journey, the new 2B/3 Series is the right tool.
What does “pass ISTA 1H” result mean?
This means that the package can withstand the specified test sequence, compared with the damage criteria you determine yourself before testing. It is not guaranteed that the goods will be intact during all transportation journeys.
10. Conclusion
ISTA 1H is what the Series 1 procedure is for individual packages over 150 lb (68 kg), use vibrate randomly and there are steps rotational edge drop required when face 1 is not attempted. It is the third option that is rarely mentioned besides 1B and 1D — and for heavy structures with low natural frequencies, this is the test that is easiest to detect problems.
The three procedures for goods over 68 kg are therefore not three “basic → advanced” levels, but three different types of excitation: 1B (fixed, basic vibration), 1D (fixed or random vibration + compression), 1H (random vibration). Choose the right question type first, then choose the process.
Bottom line: 1H is for packages over 150 lb (68 kg) that need to simulate random vibration with edge impacts. The test is only reliable when the sample, mass and damage criteria are determined before testing.
References
The full standard should be searched and ordered directly from ISTA. Below are the public sources used for reference when compiling the article:
- ISTA — Test Procedures (list of current series and projects, accessed September 27, 2026)
- ISTA — Procedure 1H — Overview and equipment required (free overview published by ISTA; not enough to conduct testing)
- ISTA — Certify your Lab (testing laboratory certification program)
Original source: ISTA 1H 2014 – Packaged-Products Over 150 lb (68 kg) (Random Vibration), © International Safe Transit Association.
Related articles:
- What is ISTA Series 1? Overview of 7 packaging testing procedures (1A–1H)
- What is ISTA 1B? Complete packaging testing process for packages over 150 lb (68 kg)
- What is ISTA 1D? Extended packaging testing procedures for packages over 150 lb (68 kg)
- What is ISTA 1G? Random vibration test procedure for packages up to 150 lb (68 kg)
- What is ISTA 1E? Testing procedures for unitized loads
- What is ISTA 2B? Partially simulated packaging test procedures for packages over 150 lb (68 kg)
- What is ISTA 2A? Partially simulated packaging test procedures for packages up to 150 lb (68 kg)
- What is ISTA 3B? Packaging testing process for LTL shipping (joint shipments)
- What is ISTA 3E? Procedure for testing unitized goods traveling by full truck (FTL)
Talk to us
Disclaimer and IP acknowledgement
This article is an explanatory content compiled by us for the purpose of introducing and disseminating knowledge. Article is not a translation, copy, abridgement or replacement of the parent standard, and is not evaluated, approved or sponsored by ISTA (International Safe Transit Association)..
The entire content of ISTA standards is copyrighted by the International Safe Transit Association, Inc. (East Lansing, Michigan, USA) — All rights reserved. ISTA® and the ISTA logo are registered trademarks of the International Safe Transit Association, Inc.; Mentioned in this article are for guidance purposes only and do not imply any affiliation, partnership or sponsorship.
Article content For reference only; Before applying for any purpose — testing, evaluation, certification or commercial decision-making — the reader should refer directly to the original ISTA document (the most complete and up-to-date version) and consult an accredited testing facility when necessary.
When performing testing, it is mandatory to use the official, current version of the standard, obtained directly from ISTA. We do not redistribute ISTA materials in any form. Information in this article may be out of date with the current version of the standard.
See more: Copyright Policy & Disclaimer by ticforall.com.
