Pinholes can have more than one cause, including substrate condition and application technique. A useful defoamer trial controls those variables so a change in surface appearance can be interpreted correctly.
Evaluation scope
JY-2117 is listed as a construction-material defoamer. Its suitability must be evaluated within the actual binder, admixture package and application process. Air content, workability, surface appearance and hardened properties are distinct design requirements; a reduction in visible bubbles is not a complete construction-product qualification.
Related material: JY-2117 Construction Material Defoamer.
Keep these variables in the record
| Item | What to record |
|---|---|
| Binder | Identify cementitious or other binder composition. |
| Admixtures | Keep the full additive package and water demand recorded. |
| Process | Control mixing, placing and specimen preparation. |
| Performance | Assess fresh and hardened properties separately. |
Trial and review plan
- Define the target substrate and preparation method, and identify the existing defect pattern. Use comparable panels and keep the control formulation available.
- Apply candidate and control materials at documented thickness and conditions. Record mixing, rest time and application technique rather than changing them informally between panels.
- Inspect the cured surfaces under consistent lighting and assess other required properties. Repeat promising results on representative substrates before changing production.
How to use the results
Fewer pinholes on one panel do not prove that the defoamer corrected every source of the defect. Compare substrate and process records and retain the complete performance assessment. Avoid increasing additive level without checking compatibility and finish quality.
Information to include in an RFQ
Provide the construction-product type, binder and admixture package, application method and current defect. Request current technical and safety guidance and a suitable trial plan. Define required performance through the responsible materials team; do not assume one defoamer is appropriate for every air-management objective.
Frequently asked questions
Are all pinholes caused by foam in the mixing vessel?
No. Substrate and application conditions can contribute. Use a controlled comparison to identify the cause and assess the entire coating or mortar process.
Are these proposed checks certified results for this grade?
No. This article describes evaluation and procurement questions, not completed customer trials. Request current grade-specific documents and appropriate test evidence. The acceptance criteria must fit the actual formulation, process or assembly being qualified.
Related reading
- Construction Defoamer Screening: Workability and Air Are Separate Endpoints
- Defoamer and Water-Reducer Compatibility in Cementitious Formulations
- Hardened-Property Checks After Changing a Construction Defoamer
Discuss a sample or technical requirement
Send your application, required specification, sample quantity and destination through the Juyou inquiry form or email info@juyousilicone.com. Telephone: +86 139 1581 4735. Contact Juyou on WhatsApp. Grade availability, packaging and lead time require quotation confirmation.
Product identity source: JY-2117 Construction Material Defoamer, checked 2026-09-14. Archive placement: 2026-08-29. Prepared for first publication on 2026-09-14 as part of the historical article backfill. No earlier publication or completed application trial is claimed.