The safety test of mailer bags is crucial to ensure the integrity, tamper-proof, tear-proof, and waterproof of items during transportation. The following are common mailer bag safety test items, methods, and standard descriptions:
1. Physical strength test
1.1 Tensile Strength Test
Test the maximum bearing capacity of the bag body or edge sealing material when stretched.
Standard: ASTM D882, ISO 527
Purpose: Verify the tear resistance of the bag during handling or transportation.
1.2 Heat Seal Strength Test
Test whether the firmness of the heat seal part of the bag mouth meets the transportation safety standard.
Standard: ASTM F88
Purpose: Evaluate the quality of the heat sealing process to prevent the opening from breaking.
1.3 Drop Test
Simulate the situation of falling during mailer, often free falling from a height of 1.2m.
According to ISO 2233 or ISTA packaging and transportation test specifications.
Purpose: Verify the impact resistance and integrity of the bag.
1.4 Puncture Resistance Test
Use a sharp object (such as a steel needle) to apply pressure to the bag to test its puncture resistance.
Standard: ASTM D5748 or ISO 7765
Applicable to transportation scenarios with high protection requirements.
2. Sealing and tamper-proof test
2.1 Peel Adhesion Strength
Test how much force is required to tear the tape after it is attached.
Verify whether it is easy to be opened illegally or whether it affects normal use.
Standard: ASTM D3330.
2.2 Tamper Evidence Test
Check whether there are obvious marks (such as glue marks, ruptures) left after the bag is torn.
Verify whether the sealing design can effectively prevent secondary use or counterfeiting.
2.3 Reuse Security Test
For disposable sealed bags, ensure that they cannot be restored to their original state or the adhesion is reduced after tearing.
For double-strip tape bags, verify whether the second strip is still sticky and reliable.
3. Environmental adaptability test
3.1 Water Resistance Test
Immerse the bag partially or completely in water to test whether there is leakage or water absorption.
You can also spray water manually to test the moisture resistance of the seal and bag body.
3.2 Temperature Resistance Test
Put the bag in a high or low temperature environment (such as -20°C to 60°C) to test whether the material is deformed and the tape is ineffective.
4. Material safety and compliance testing (such as export requirements)
Heavy metal content (RoHS)
Phthalates testing
REACH compliance
Food contact safety (if some need to contact food): FDA, GB 4806, etc.
Testing tools and equipment (some examples)
Universal material testing machine (tensile strength, puncture strength, heat seal strength)
Seal peeling force tester
Waterproof test box or spray equipment
Drop test table (compliant with ISTA standards)
Constant temperature and humidity chamber (environmental resistance test)
5. Practical application suggestions
Factory: It is recommended to sample and test each batch, and keep the test records for traceability;
Brands/cross-border e-commerce: Require suppliers to provide third-party test reports;
Exporting companies: must meet the safety and environmental protection requirements of the destination country for plastic bags.
