Who this is for
This guide is for shelf-stable food entrepreneurs, sauce and soup brands, jarred meal products, co-packers, private label brands, small food manufacturers, QA coordinators, and owners evaluating canned, jarred, pouched, or retorted products.
It is most useful before buying equipment, selecting a co-packer, approving a shelf-stable formula, or telling a buyer the product is commercially sterile.
What is a low-acid canned food?
A low-acid canned food is generally a food with low acidity and enough water activity to support microbial growth, packaged in a hermetically sealed container, and processed to be shelf-stable. The exact classification should be verified using FDA definitions and qualified support.
“Canned” does not only mean metal cans. The concept can include other hermetically sealed containers, such as jars, pouches, or other sealed packages depending on product and process.
Use this page with Acidified Foods FDA Requirements, Process Authority Letter for Food Products, Food Safety Plan Template, HACCP Plan Guide, and the templates hub.
Why low-acid shelf-stable foods are high risk
Low-acid shelf-stable foods can be high risk because the product may support the growth of dangerous microorganisms if the thermal process, container closure, formulation, or cooling controls fail. For these products, a weak process is not just a quality issue.
This is why process authority support, scheduled process control, operator training, record review, and deviation handling are central to LACF systems.
LACF vs acidified foods
Low-acid canned foods and acidified foods are related but different categories. Acidified foods use acidification to reach an acidified finished condition. Low-acid canned foods rely on a scientifically established process for a low-acid product in a hermetically sealed container.
The difference affects process filing, processing controls, records, training, and support needed from a process authority. Businesses should classify the product before deciding equipment, label claims, shelf-life approach, or co-packer fit.
Hermetically sealed containers
A hermetically sealed container is designed to prevent microorganisms from entering after processing. Container integrity is part of the food safety system, not only a packaging feature.
For practical QA work, this means closure checks, container specifications, seam or cap controls, visual inspection, handling controls, and finished product records may matter. A safe process can be undermined by poor closure control.
Scheduled process concept
A scheduled process is the established process for a specific product, container, and processing method. It may include time, temperature, retort or processing conditions, fill conditions, critical factors, and container-specific details.
The scheduled process should be controlled in production records. If the product, container size, formulation, processing equipment, or critical factors change, the business should review whether the scheduled process and filing still apply.
Process filing overview
FDA has establishment registration and process filing expectations for commercial processors of acidified and low-acid canned foods. The details are product- and facility-specific, so small businesses should verify current FDA instructions before producing or distributing products.
Process filing is not a marketing claim. It is tied to product, style, container, method, and scheduled process support.
Process authority support
A process authority can evaluate whether the process is adequate for the product. The process authority may need formula, pH, water activity, container information, thermal process data, equipment information, fill weight, and production flow.
The process authority letter guide explains what information may be requested and how to organize it before review.
What to include
A low-acid canned food review file should include:
- Product description and formula version.
- pH and water activity support.
- Container type, size, closure, and supplier specification.
- Process authority documentation.
- Scheduled process and process filing evidence where applicable.
- Thermal process records.
- Critical factor monitoring records.
- Container closure checks.
- Deviation and process review procedure.
- Finished product lot coding and distribution records.
Records to keep
Keep process authority letters, scheduled process records, FDA filing confirmations where applicable, thermal process records, retort or processing charts, container closure records, formulation records, calibration records, operator training records, deviation records, corrective actions, finished product release records, and lot code traceability records.
Records should show that the product was made according to the scheduled process and reviewed before release.
Common regulatory/customer requests
Regulators, buyers, co-packers, or auditors may request establishment registration evidence, process filing details, process authority support, scheduled process documents, processing logs, deviation records, container closure records, and lot traceability.
Private label brands may also be asked to explain who controls the process, which facility makes the product, and how formula changes are approved.
Practical checklist
- Determine whether the product is LACF, acidified, refrigerated, frozen, or another category.
- Confirm pH and water activity with qualified review.
- Identify the exact container type and size.
- Obtain process authority support before commercial production.
- Verify establishment registration and process filing expectations.
- Train operators on critical factors.
- Use controlled batch and processing records.
- Review deviations before product release.
- Maintain lot code and distribution records.
- Review labels and claims against the controlled product version.
Common mistakes
Common mistakes include treating a jarred low-acid product like a normal sauce, using a home canning process for commercial production, changing container size without process review, missing closure checks, weak deviation records, and assuming a co-packer’s general certification proves the specific product process is covered.
Another mistake is starting with branding and packaging before confirming whether the product can be safely and legally made as shelf-stable.
QA perspective
From a QA perspective, LACF work needs discipline around critical factors. The file should connect the process authority support, scheduled process, process filing, production record, container closure checks, deviation review, and finished product lot.
If an auditor asks why a lot was released, QA should be able to show the process record, critical factor checks, review signature, and any corrective action in one controlled file.
Source notes
Verify LACF classification and requirements with official sources:
- FDA Acidified & Low-Acid Canned Foods Guidance Documents & Regulatory Information.
- FDA Guide to Inspections of Low Acid Canned Food: Process Filing Requirements.
- FDA Guide to Inspections of Low Acid Canned Food: Processing Authorities.
- eCFR 21 CFR Part 108 and 21 CFR Part 113.
Official requirements should be verified with FDA, state/local regulators, process authorities, customers, certifying bodies, or qualified professionals.
FAQ
Is every canned food a low-acid canned food?
No. Classification depends on pH, water activity, formulation, container, process, and regulatory definitions. Some products may be acidified foods instead, while others may be naturally acidic or require different controls.
Can a small business create its own thermal process?
A business should not rely on guesswork for shelf-stable low-acid products. A qualified process authority is commonly needed to establish or support the scheduled process.
Does a co-packer handle all LACF responsibility?
A co-packer may control the facility and process, but the brand owner should still understand product classification, records, label review, customer requirements, and how the scheduled process is controlled.