Food Packaging Safety: The Real Bill for 3 Categories of Tests — Migration, Microbiology, and Heavy Metals from 8,000 RMB per Item

Last month a client running a food-grade gift box program came to me. He had just developed a new mooncake gift box, with a PVC blister tray lining the inside of the box. He asked: "Does this need to be tested? I see others don't test it and go straight to market." I asked him back: "Does the blister tray in your mooncake gift box come into direct contact with the mooncakes?" He replied: "Yes, the mooncakes sit in the blister tray, and the customer picks them up directly when opening the box." I said: "Then you must send it for GB 4806.7 food contact material testing. All three categories — migration + microbiology + heavy metals — need to be done, or you'll be in violation the moment you go to market." He sounded a bit stunned: "I've made tea tins and baijiu boxes before without testing, and nothing happened?" I answered: "That's because those were 'indirect contact' (the food had an inner bag, and the gift box was the outer layer). Now your mooncakes sit directly on the blister tray — that's 'direct contact.' The standards are completely different."

This client's pain point is what 90% of food packaging buyers face: food packaging testing isn't 'do it if you want to' — it's 'direct contact vs. indirect contact' that decides whether you need to test, which items to test, and how much each item costs. This article walks you through the "3 categories of tests + per-item bill + criteria for deciding whether to test" for food packaging.

Test Category 1: Migration (Total Migration + Specific Migration)

Migration testing is the "core item" of food packaging safety. It simulates the total amount of chemicals that migrate from packaging materials into food after the food has been stored in the packaging for a period of time (typically 10–30 days).

Three common sub-items in migration testing:

1) Total Migration. Measures the total migration of the packaging material into simulated food (typically 4 simulants: water / acid / alcohol / oil), with limits ≤ 10 mg/dm² (EU) or ≤ 60 mg/kg (China GB 4806.1). Exceeding the total migration limit means the material has "substantial substance release," directly impacting food safety.

2) Specific Migration. Measures the migration of specific harmful substances (heavy metals, plasticizers, azo dyes, monomer residues, etc.). Common substances include lead, cadmium, mercury, hexavalent chromium, phthalates (plasticizers), bisphenol A, formaldehyde, etc. Each substance has a different limit and a different testing fee.

3) Migration Condition Testing. Depending on food storage conditions, migration testing is divided into 4 categories: room temperature (20°C), refrigeration (4°C), freezing (-18°C), and high temperature (70°C or 100°C). Clients choose the test condition based on actual use; different conditions have slightly different fees.

Real bill: a client's single-use plastic lunch box (PP material) was sent for GB 4806.7 food contact material testing. Items tested: total migration + lead + cadmium + phthalates, 4 items total, 8,000–15,000 RMB each, totaling 35,000 RMB. Testing cycle: 25 working days. If it had gone to market without testing and been found non-compliant by the market regulator's spot check: fine of 50,000–100,000 RMB + recall + media exposure.

How do bosses decide whether to test? Look at 3 details.
- Packaging in direct contact with food (blister tray / inner bag / direct-contact plastic / paper): testing is mandatory
- Packaging in indirect contact with food (gift box outer layer / outer carton): no food-grade testing required, but the material itself must comply with GB 4806.1 general requirements
- Special foods (infant / health food): more items, stricter standards; per-item fees may double

Test Category 2: Microbiology (Total Plate Count + Pathogens)

Microbiological testing is the "hygiene item" of food packaging safety. It checks whether packaging materials have been contaminated by microorganisms during production, transport, and storage, and whether they can become a "breeding ground" for microbial growth.

Three common sub-items in microbiological testing:

1) Total Plate Count. Measures the total bacterial count on the surface or inside the packaging material, reflecting its hygienic status. Food-grade packaging requires total plate count ≤ 100 CFU/g (or per the limit specified in GB standards). Exceeding the limit means contamination during production or storage, which may affect food hygiene.

2) Coliforms / Pathogens. Tests whether the packaging material contains coliforms, Salmonella, Staphylococcus aureus, or other pathogens. Pathogens must not be detected. Detecting pathogens = direct determination of "hygiene failure," recall + fine.

3) Molds and Yeasts. Tests whether the packaging material is contaminated by mold. Food-grade packaging requires molds and yeasts ≤ 10 CFU/g. Exceeding the limit means the storage environment was humid or anti-mold treatment was inadequate, possibly affecting food shelf life.

Real bill: a client's single-use paper cup (with inner coating) was sent for food packaging microbiological testing. Items tested: total plate count + coliforms + pathogens + molds and yeasts, 4 items total, 2,000–4,000 RMB each, totaling 12,000 RMB. Testing cycle: 7–10 working days. If it had gone to market without testing and been spot-checked for excessive total plate count: fine + recall + media exposure.

How do bosses decide whether to test? Look at 3 details.
- Paper / plastic / composite packaging in direct contact with food: microbiological testing is mandatory
- Packaging in indirect contact with food (gift box outer layer): microbiological testing usually not required, but clients may voluntarily test to boost brand trust
- Packaging stored in humid environments / for long-term food storage: recommend testing for molds and yeasts to prevent mildew

Test Category 3: Heavy Metals (Lead / Cadmium / Mercury / Hexavalent Chromium)

Heavy metal testing is the "toxicity item" of food packaging safety. It checks whether packaging materials contain heavy metals harmful to humans, and whether these metals can migrate into food during use.

Three common sub-items in heavy metal testing:

1) Lead, Cadmium. These are the 2 most common heavy metals. Lead and cadmium may be present in packaging materials (especially inks, pigments, plastic additives) and migrate into food. GB 4806 requires lead and cadmium migration ≤ 0.05 mg/kg (China) or ≤ 0.01 mg/kg (stricter EU standard).

2) Mercury, Hexavalent Chromium. These are 2 highly toxic heavy metals. Mercury is common in certain inks and pigments; hexavalent chromium is common in certain plastic additives. GB 4806 requires mercury ≤ 0.01 mg/kg; hexavalent chromium must not be detected.

3) Specific Element Migration (Nickel, Arsenic, Antimony, etc.). For certain special materials (such as stainless steel, glass, ceramic packaging), specific element migration testing is required. Different materials require different items and incur different fees.

Real bill: a client's metal mooncake tin (tinplate) was sent for heavy metal testing. Items tested: lead + cadmium + mercury + hexavalent chromium + nickel migration + arsenic, 6 items total, 3,000–8,000 RMB each, totaling 25,000 RMB. Testing cycle: 15–20 working days. If it had gone to market without testing and been spot-checked for excessive heavy metals: fine + recall + media exposure.

How do bosses decide whether to test? Look at 3 details.
- Metal packaging (tinplate / stainless steel / aluminum): heavy metal testing is mandatory
- Glass / ceramic packaging: specific element migration testing is mandatory
- Plastic / paper packaging (inks may contain heavy metals): lead and cadmium testing is mandatory; add mercury and hexavalent chromium if needed

The "3 Scenario Bills" for Food Packaging Testing

Now that we've covered the 3 categories of tests, let's flip the perspective and look at the "3 scenario bills" for food packaging testing.

Scenario 1: Small-batch trial production in direct contact with food (500–5,000 units). Recommended tests: total migration + total plate count + lead and cadmium, 3 items total, totaling 15,000–25,000 RMB, cycle 20–30 days.

Scenario 2: Mid-batch mass production in direct contact with food (10,000–100,000 units). Recommended tests: total migration + specific migration (plasticizers, bisphenol A, etc.) + total plate count + coliforms + pathogens + lead, cadmium and mercury, 6–8 items total, totaling 30,000–60,000 RMB, cycle 25–40 days.

Scenario 3: Food packaging for export (Europe and the US). Recommended tests: full EU 10/2011 standard testing + US FDA 21 CFR testing, totaling 80,000–150,000 RMB, cycle 30–60 days.

The "3 scenario bills" for food packaging testing aren't about "the more expensive the better" — they're about "matching to the scenario." Based on food type, sales volume, and export needs, clients choose the appropriate test items — both controlling costs and meeting regulatory requirements.

The 4 Questions Bosses Should Ask Testing Labs

Finally, here are 4 questions bosses should ask testing labs to avoid being fooled by "low-price testing."

Question 1: "Is the test report recognized by the market regulator?". If the lab answers "our reports carry CMA / CNAS accreditation," the report has legal effect. If they answer "we're an enterprise self-test," the report has no legal effect, and clients cannot use this report to go to market.

Question 2: "How long is the testing cycle? Can it be expedited?". The standard testing cycle is 20–30 days; expedited can be 7–10 days (fee doubles). If clients are rushing a new product launch, plan time ahead to avoid launch delays.

Question 3: "Do the test items cover the destination country's regulations?". For the domestic market, GB 4806 testing is enough. For export, FDA / EU 10/2011 and other sets of testing are required. If the lab only handles domestic standards, switch labs.

Question 4: "If the test fails, can the lab provide corrective suggestions?". A good lab will tell clients: which item exceeded, by how much, possible causes (material choice / process issue / storage issue), and help clients with corrective action. If the lab only issues reports without advice, clients are left to figure it out themselves — long corrective cycles and high costs.

Ask these 4 questions and you can basically tell whether this testing lab is a partner who "helps you clear regulatory hurdles" or one who "just issues a report". Food packaging testing isn't "scrambling to pass inspection" — it's "protecting your brand." Choose the right testing lab, and clients can truly keep regulatory risk in a cage.

Further Reading

GB 4806.1 to 4806.11 Demystified: How to Actually Use the 5 Core Standards for Food Contact Packaging

Food Contact Packaging GB 4806 Test Items in Practice: 5 Commonly Stuck Items + 3 Remedies for Failure

3 Mandatory Requirements ISO 22000 Food Safety Management System Imposes on Packaging Plants