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Seal Integrity and ISO 11607 by Designation: Reading Sterile-Barrier Materials
For a sterile barrier system, seal integrity is the property that the seals between barrier materials are continuous, strong enough and free of channels, and it is what the packaging maker validates against ISO 11607 by designation. At the material level, the converter selects and converts barrier materials whose sealability supports that validation, and understands the test-method designations the maker uses, without ever claiming a material is a sterile or certified barrier.
This guide reads seal integrity as a set of material and test-method properties, keeps the validated system with the packaging maker, and makes no sterility claim.
What seal integrity is, at the material level
For a sterile barrier system, seal integrity is the property that the seals between the barrier materials are continuous, strong enough, and free of channels or leaks. It is what the packaging maker validates and verifies against ISO 11607 by designation. At the material level, the converter's job is to select and convert barrier materials whose sealability supports that validation, and to understand the test-method designations the maker uses, without ever claiming a material is itself a sterile or certified barrier.
This guide reads seal integrity as a set of material and test-method properties, and keeps the validated system where it belongs, with the packaging maker.
- Sealability: how well a barrier material forms a continuous seal to its mating web under the maker's sealing process. A material property that supports, but does not constitute, a validated seal.
- Seal strength (ASTM F88): the force to separate a sealed barrier, a test-method designation the packaging maker uses to characterize the seal.
- Seal-defect detection (ASTM F1929): a dye-penetration test-method designation for detecting channels or leaks in a porous package seal.
- Porosity and film barrier: the material properties that let a porous web allow sterilant passage while the system, once sealed and validated, maintains the barrier.
Why is seal integrity a system property, not a material claim?
A barrier material can have excellent sealability on its data sheet and still end up in a package with poor seal integrity, because integrity depends on the whole system: the two webs, the sealing process and its parameters, the package geometry, and the validation the maker performs. Conversely, no single material can guarantee integrity by itself, because the seal is formed between materials by a process the converter does not own.
That is why ISO 11607 is referenced by designation and the validated sterile barrier system belongs to the packaging maker: the standard frames how the maker designs, validates and verifies the system, including seal strength to ASTM F88 and seal-defect detection to ASTM F1929 as test-method designations. The converter selects and converts barrier materials whose properties support that work, supplies them clean and to geometry, and never represents a material as a finished sterile barrier.
Getting this framing right is as important as getting the material right.
Reading the properties: what each is and is not
| Property / method | What it tells you | What it does not tell you |
|---|---|---|
| Sealability (material) | How readily a barrier web forms a continuous seal in the maker's process | That the finished package has integrity, which the maker validates |
| Seal strength (ASTM F88) | The force to separate a sealed barrier, a verification method | The sterility of the contents, which the system assures |
| Seal-defect dye penetration (ASTM F1929) | A method to detect channels or leaks in a porous seal | A pass on a material alone; it tests a sealed package |
| Porosity (porous web) | That the web can allow sterilant passage as a material property | That the barrier is maintained; that is the validated system |
| ISO 11607 (designation) | The framework the maker uses to design and validate the system | Anything H-O certifies; it is referenced by designation only |
A worked reading: supporting the maker's validation
Suppose a package uses a porous spunbond lid sealed to a formed film tray. The converter selects the spunbond and the film for sealability and the maker's process window, and supplies them clean and die-cut to geometry. The packaging maker then sets the sealing parameters, builds samples, and characterizes the seal with seal strength to ASTM F88 and checks for channels with dye penetration to ASTM F1929, all within an ISO 11607 validation by designation.
If the seal strength is out of window or a channel appears, the fix may be a sealing-parameter change, a material change, or both, but the integrity verdict is the maker's, on the system, not the converter's, on the material. H-O's contribution is clean, correctly converted barrier stock whose properties support that validation, with no claim of sterility or certification.
Barrier Material: Which Property and Method to Read
For a porous lid, read porosity and sealability as material properties; a porous spunbond fits and the maker validates the system. Seal strength is verified by the maker to ASTM F88. This is a material reading, not a sterility claim.
Illustrative only; confirm against current material data and a drawing review. This selector returns which property or method to read and a material family direction, not a grade, a value or any sterility or certification claim, and it never represents a material as a validated sterile barrier. Seal strength (ASTM F88) and seal-defect detection (ASTM F1929) are verification methods the packaging maker uses; the sterile barrier system is validated by the maker toward ISO 11607 by designation.
Design and converting considerations
- Read sealability as a material property. It supports the maker's seal, but the validated seal is formed by the maker's process; supply clean stock to geometry.
- Know the verification methods. Seal strength to ASTM F88 and seal-defect detection to ASTM F1929 are the maker's methods; understanding them helps select compatible materials.
- Keep ISO 11607 by designation. Reference it as the maker's framework; never state that a converted material is certified or sterile.
- Mind cleanliness and handling. Barrier stock is converted and handled for the application's cleanliness; state the requirement.
- Process fit. Barrier stock is die-cut and slit to lids, pouches and webs; foam trays are milled and cut; parts are kitted as inputs to the maker's system.
Common framing and material mismatches
| Mismatch | Root cause | Correction |
|---|---|---|
| Material called a sterile barrier | Sealability read as integrity | Integrity is the maker's validated system; the material supports it |
| Seal strength expected from material alone | ASTM F88 treated as a material pass | F88 verifies a sealed package; the maker runs it on the system |
| Channels blamed on the web only | A leak attributed to material, not the sealing process | Read ASTM F1929 on the package; the fix may be parameters or material |
| ISO 11607 treated as a converter certification | The designation read as an H-O claim | Reference it by designation; the maker validates against it |
| Barrier and cushioning conflated | One material expected to seal and protect | Specify the barrier stock and the cushioning foam separately |
How H-O Products helps
H-O Products is a precision die-cut converter serving medical and clean-component programs. For medical packaging and kitting we convert porous spunbond, films and foams into barrier components and tray cushioning, supplied clean and to geometry as inputs to your sterile barrier system. As an ISO 9001:2015 certified organization we help you select barrier materials whose sealability supports your validation and understand the seal-strength and seal-defect test-method designations your process uses.
We do not design or validate sterile barrier systems, we do not run the verification, and we never represent a converted material as a sterile or certified barrier; the validated sterile barrier system, its seal validation and its sterility assurance are designed and released by the packaging maker against ISO 11607 by designation. Grade values are confirmed against the manufacturer's current technical data sheet.
Selecting barrier materials for a validated system?
Tell us the barrier element, the seal concern and your process window, and we will help you read sealability and the seal-strength and seal-defect test-method designations, recommend a material direction, and supply clean stock to geometry. The validated sterile barrier system stays with you.
Samples typically ship in 3 to 5 business days for common die-cut configurations; standard production runs about two weeks; special orders are quoted to the job.
Family-owned in Winsted, Connecticut since 1971 · ISO 9001:2015 certified · OEMs worldwide send us a drawing — and get back their part.
Related reading
ApplicationMedical Packaging & Kitting Materials (application page)Read →
GuideCushion or Barrier? Choosing Materials for Medical Packaging and KittingRead →
GuideHow to Spec a Medical Packaging or Kitting Part: What to Send H-O for a QuoteRead →
IndustryMedical & clean components overview (industry hub)Read →
Frequently asked questions
What is seal integrity for a sterile barrier system?
Seal integrity means the seals between barrier materials are continuous, strong enough and free of channels or leaks. It is a property of the whole sterile barrier system, validated and verified by the packaging maker against ISO 11607 by designation, using methods such as seal strength to ASTM F88 and seal-defect dye penetration to ASTM F1929. At the material level, a converter selects barrier materials whose sealability supports that work. No single material constitutes integrity by itself, and H-O makes no sterility or certification claim.
Does seal strength to ASTM F88 mean a material is a sterile barrier?
No. ASTM F88 is a test-method designation for the force to separate a sealed barrier; it is a verification method the packaging maker runs on a sealed package, not a material pass. A material's sealability supports the seal, but the seal is formed by the maker's process and the integrity is verified on the system. H-O converts barrier stock as an input and never represents it as a sterile or validated barrier; the validated system is the packaging maker's against ISO 11607 by designation.
How is ISO 11607 used on this page?
By designation only. ISO 11607 is the designation for packaging for terminally sterilized medical devices, and it frames how the packaging maker designs, validates and verifies a sterile barrier system, including seal strength and seal-defect detection. H-O Products converts barrier materials as inputs to that system and references the standard by designation; it does not certify packages, does not validate systems, and claims only ISO 9001:2015 for its converting process. Sterility assurance belongs to the packaging maker.
Request a quote for your sterile-barrier material part
Send H-O your barrier element and process window—engineering helps you read sealability and the test-method designations, recommends a material direction, and supplies clean stock to geometry.
Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
References
- ISO 11607, Packaging for Terminally Sterilized Medical Devices. International Organization for Standardization (referenced by designation).
- ASTM F88, Standard Test Method for Seal Strength of Flexible Barrier Materials. ASTM International.
- ASTM F1929, Standard Test Method for Detecting Seal Leaks in Porous Medical Packaging by Dye Penetration. ASTM International.
- ASTM D1056, Standard Specification for Flexible Cellular Materials: Sponge or Expanded Rubber. ASTM International.
- Manufacturer technical data sheets for the named barrier and foam material families; grade-specific values and sealability are confirmed on the maker's current TDS.
This article describes material families H-O Products converts and references published standards by designation (ISO 11607 as the designation for terminally sterilized medical device packaging, ASTM F88 for seal strength and ASTM F1929 for seal-defect dye penetration as test-method designations, ASTM D3574 for urethane cellular materials, ASTM D1056 for cellular rubber). It describes kit-cushioning and sterile-barrier packaging materials only, and makes no patient, clinical, therapeutic or sterility-assurance claim.
A sterile barrier system is designed, validated and released by the device or packaging maker against ISO 11607 by designation; selecting and converting a material is not a sterility, sterilization or certification claim, and nothing here certifies a package as sterile. H-O Products is a precision die-cut converter, not a raw-material producer and not a medical-device or packaging-system manufacturer; this is not, and does not imply, an ISO 13485 certification, an FDA device registration, a cleanroom certification or a sterile-barrier certification.
The only certification claimed is ISO 9001:2015, which governs the converting process. Grade-specific values are confirmed against the manufacturer's current technical data sheet and an engineering drawing review. All parts are custom manufactured to order and minimum production run quantities apply.