# Surface Energy & Hydrolytic Delamination: Annealing Lehr SO2 Surface Treatment on Cosmetic Glass Jars
TL;DR — The inner surface of a glass container is where the packaging chemistry conversation actually happens, and that surface is decided by the supplier's process — annealing-lehr treatments such as SO2 sulfur treatment and dealkalization — together with the formulation it will hold. In this program what is recorded is the catalog side: glass is a registered material, fragrance glass bottles are formed by external partners, the cream jar family spans 25 catalog models with double-layer closures in PP+PMMA or PP+PETG, and the dropper family spans 73 catalog models with glass and PET bottle bodies. No SO2 treatment or surface classification is recorded in the material register, and glass surface treatment is executed by external partners, per project. Hydrolytic delamination is a per-project trial subject closed through the compatibility and drop test hooks, with criteria configured per project.
Why: The Chemical State of the Inner Surface Is a Supplier-and-Formula Conversation
- The chemistry lives at the interface. Surface state, ion pickup, and delamination risk are decided at the glass inner surface where the contents touch the container — before any jar or dropper decision is made;
- The record holds the container families. Glass is a registered material, fragrance glass bottles are formed by external partners, the cream jar family spans 25 catalog models with double-layer closures in PP+PMMA or PP+PETG, and the dropper family spans 73 catalog models with glass and PET bodies;
- The treatment sits outside the record. SO2 treatment, dealkalization, and surface classification are glass-industry process knowledge — no treatment is recorded in the material register, and glass surface treatment is executed by external partners, per project;
- Delamination is a project trial. Surface-energy and hydrolytic-delamination questions close through project trials and the compatibility hook, continuing the discipline of the hydrolytic-resistance discussion on glass grades.
How: The Conversation Between the Supplier's Line and the Project's Chemistry
3.1 The recorded side: glass and its container families
The position on glass is deliberately bounded, and it has the same shape as the hydrolytic-resistance discussion already published. Glass is a registered material. Fragrance glass bottles are formed by external partners — the program has no glass-forming capability, so glass geometry, process, and surface decisions travel through the partner's line rather than a molding floor. The families give the practical scope: the cream jar family spans 25 catalog models with double-layer closures recorded in PP+PMMA and PP+PETG, and the dropper family spans 73 catalog models with glass and PET bottle bodies. Those are the catalog-side facts; everything past them about glass chemistry is not a registered position.
3.2 The treatment boundary: what is and is not on record
The boundary must be stated plainly: no SO2 treatment or surface classification is recorded in the material register. Sulfur treatment in the annealing lehr, dealkalization, surface-energy classification — none of these appear as program data, and the program makes no claim of applying any of them. Glass surface treatment is executed by external partners, per project. When a project involves a treated glass surface, the conversation crosses the partner boundary at every step: the partner's process defines what the surface is, the project defines what the surface must do, and the program supplies the verification hooks.
3.3 The annealing lehr and surface chemistry: industry process knowledge
As glass-industry process knowledge, the annealing lehr is where containers cool under controlled conditions after forming, and it is also where treatments such as SO2 sulfur treatment — sometimes described as surface dealkalization — can be applied to modify the chemical behavior of the glass surface. Such treatments are discussed in industry practice because they can influence how readily the inner surface interacts with the contents. That description is directional guidance only: no treatment parameters, no exposure values, and no surface-energy numbers are published, because none are recorded in the program. Surface energy as a concept — how a liquid wets and interacts with the surface — is a well-known measurement vocabulary in glass and container quality work, and it is exactly the kind of value this program does not self-claim.
The practical consequence is unchanged from the rest of the program: chemistry is confirmed per project, not assumed per process name. Surface-related behavior between the container and a formulation is established from the partner's process record combined with the project's own trials.
3.4 Hydrolytic delamination: a project-level trial subject
Hydrolytic delamination is the practical failure mode this conversation is about: a leaching of the inner glass surface that in some conditions can release thin flakes into the contents. As industry methodology, delamination susceptibility depends on the pairing of a specific lot's surface — its composition, forming, and treatment history — with the specific chemistry it must hold for the product's shelf life. It therefore cannot be a catalog property; it is inherently a per-project trial subject, observed on real filled samples of the actual construction, under the project's chemistry and duration, with findings recorded per project.
The frame matches the hydrolytic-resistance discipline established for glass grades: the classification vocabulary and the test methods are industry and pharmacopeia practice, and the program does not self-claim any of them. What the program supplies is the hook set — the compatibility test for the chemistry pairing and the drop test for physical integrity — along with the partner boundary that owns the surface.
3.5 The verification flow that closes a glass-surface question
Putting it together, a treated-surface glass project resolves in a fixed order:
- Confirm the catalog side: glass material, external-partner forming, and the cream jar or dropper family scope where applicable;
- Bring the formulation chemistry — pH, chelating agents, and ionic strength — into the project specification;
- Note the boundary: SO2 treatment and surface classification are industry knowledge and partner-side process, not registered fields;
- Route verification through the compatibility hook and project trials — including fill-hold observation for delamination — with criteria configured per project, and use the drop test for physical integrity;
- Release the part per project, recording the surface-related assessment and the trial results together.
That flow is the whole architecture of a glass-surface conversation: the register holds the catalog facts, the quality program holds the hooks, the external partner holds the glass process, and the project holds the criteria.
<pre class="language-mermaid"><code>flowchart LR
A[Glass containers<br/>external partners,<br/>jar + dropper families] –> B[Surface chemistry<br/>SO2 / dealkalization,<br/>industry knowledge]
B –> C[Hydrolytic<br/>delamination risk<br/>per project]
C –> D[Compatibility +<br/>drop verification]
D –> E[Release per project]
</code></pre>
What: Verified Program Data and the Verification Hooks
- Glass (recorded): glass is a registered material;
- External-partner boundary (recorded): fragrance glass bottles are formed by external partners; the program has no glass-forming capability — glass surface treatment is also executed by external partners, per project;
- Cream jar family (recorded): 25 catalog models with double-layer closures recorded in PP+PMMA and PP+PETG;
- Dropper family (recorded): 73 catalog models with glass and PET bottle bodies;
- Surface-treatment boundary (recorded): no SO2 treatment or surface classification is recorded in the material register — annealing-lehr sulfur treatment, dealkalization, and surface-energy classification are glass-industry process knowledge, not program data;
- Quality hooks (capability-level): the compatibility test and the drop test are registered capabilities of the quality program; parameters and criteria are set per project;
- What is not claimed: no SO2 process application, no treatment parameters, no surface-energy values, no hydrolytic classes, and no delamination propensity.
Gotchas
- No treatment lives in the program record. No SO2 treatment or surface classification is recorded in the material register — copy implying the program applies sulfur treatment or dealkalization would be a claim without a basis.
- Surface treatment runs at external partners. Even project-level treated-surface options travel through the partner's line, per project; the partner owns the process verification, and the program does not self-claim the treatment.
- Surface classification is industry knowledge, not program data. Surface-energy ratings, hydrolytic classes, and lehr parameters are glass-industry vocabulary — none has a registered value in this program.
- Delamination is a pairing, observed per project. A specific lot's surface with a specific formula; findings are recorded per project on filled samples, never as a catalog property.
- No numbers may be invented. No SO2 concentrations, no lehr temperatures, no exposure times, and no surface-energy units exist in the register; any such value in copy would be fabricated.
- Keep the families straight. Cream jars (25 catalog models, double-layer closures in PP+PMMA or PP+PETG) and droppers (73 catalog models, glass and PET bodies) are the recorded scopes; glass-surface copy must stay within them.
- This continues the hydrolytic-resistance discipline. Like the Type I vs. Type III discussion, treated-surface behavior is a project trial subject closed through the compatibility hook — not a registered grade or value.
Related Resources
- Categories: Jars · Droppers
- Related insight: Type I vs. Type III Glass & Hydrolytic Resistance · Heavy-Base Glass Jars & Thermal Shock · Heavy-Wall PET vs. Glass · The 12-Test Lab Matrix
- Quality & Testing Capabilities — compatibility and drop testing · Customization — per-project glass surface and verification criteria