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Medical Grade DINCH vs DOP/DEHP Safety Review (EN 71-3 & FDA Compliance)
Oct 24, 2026
Contact-safety review of ultra-pure DINCH (CAS 166412-78-8) for medical, toy and food-contact PVC: migration behaviour, biocompatibility testing direction and required documentation.
Medical Grade DINCH vs DOP/DEHP Safety Review (EN 71-3 & FDA Compliance)
Why is ultra-pure DINCH chosen for medical and food-contact flexible PVC? DINCH is a cyclohexane dicarboxylate plasticizer with a non-phthalate structure and a strong low-migration, low-volatility profile. It is used in children's toys, medical infusion tubes and food wrap films, where contact safety and extractable behaviour are the primary selection criteria and compliance must be confirmed against the target market.
The selection problem in contact applications
Flexible PVC used in medical tubing, food wrap and toys is judged differently from industrial PVC. The questions are not only mechanical: they concern what can migrate out of the article and into the patient, the food or the child, and what documentation can prove it to a regulator, a hospital procurement team or a retail brand owner.
DINCH was developed for this class of application. It is a cyclohexane dicarboxylate (CAS 166412-78-8) with a non-phthalate structure, and it is widely used in contact applications where ortho-phthalates are restricted.
DINCH performance profile for contact applications
| Evaluation area | Typical expectation | Why it matters in contact use |
|---|---|---|
| Chemical family | Cyclohexanedicarboxylate ester, non-phthalate | Keeps the article outside ortho-phthalate restriction scope |
| Migration tendency | Low migration direction | Reduces transfer into food, fluids and skin contact |
| Volatility | Low volatility direction | Limits emissions during sterilisation and long-term storage |
| Compatibility with PVC | Good, comparable processing window to general plasticizers | Allows substitution without redesigning the compound |
| Extractables control | Supported by purity and test documentation | Central to biocompatibility and food-contact files |
| Sterilisation exposure | Evaluated for common medical sterilisation routes | Required before medical tubing qualification |
| Documentation | Batch COA, TDS and SDS available on request | Necessary for regulatory and hospital review |
The values are directional and describe how the grade is positioned. Performance in a specific article must be confirmed against the target-market regulation and the corresponding batch test report.
DINCH versus DOP and DEHP
The substitution question is usually phrased as a comparison with DOP (DEHP), the ortho-phthalate that DINCH was developed to displace. The two chemistries differ in structure, regulatory position and migration behaviour.
| Evaluation area | DOP / DEHP (ortho-phthalate) | DINCH (cyclohexanedicarboxylate) | Consequence for the article |
|---|---|---|---|
| Chemical family | Ortho-phthalate ester | Non-phthalate cyclohexane dicarboxylate | Keeps the article outside ortho-phthalate restriction scope |
| Regulatory position | Restricted in a growing range of consumer and contact applications; carries a reproductive-toxicity classification in the EU that has driven substitution | Widely used in contact-sensitive applications, with its own listing status per market | Market access improves, but the finished article still needs its own compliance file |
| Migration and extraction direction | Higher extractables direction | Low migration direction | Less transfer into food, fluids or skin contact |
| Typical remaining use | Some industrial PVC where contact safety is not the driver | Medical tubing, food wrap films, toys and childcare articles | Selection turns on the contact scenario rather than on cost alone |
| Documentation load | Often requires justification for consumer goods | Material dossier plus article-level testing | Plan the dossier before sampling, not after |
Where a legacy formulation still runs on DOP or DEHP, the practical route is a stepwise substitution: keep the loading ladder, recheck hardness and processing window, then re-qualify the article against the market's migration requirement.
Standards and documentation that are normally requested
Contact applications are governed by a document chain rather than by a single test. A typical file for a medical or food-contact article includes:
- Biocompatibility testing direction for the finished article, such as ISO 10993 series evaluations, performed on the article and not on the raw material alone.
- Food-contact framework documents for food wrap and closures, following the relevant regional framework such as EU 10/2011 and, for the United States, FDA 21 CFR requirements.
- Toy safety documentation where the article is intended for children, since toy standards restrict both the additive list and migration limits.
- Batch certificate of analysis, showing purity and the controlling parameters for the delivered lot.
- TDS and SDS, for the compounder's own technical file and for the finished-product manufacturer.
Because the required document set depends on the market and on the finished article, the practical first step is to define the target market and the contact scenario, then confirm which documents the grade can support.
EN 71-3 and FDA angles in practice
Two references come up most often when a contact project turns into a documentation exercise.
EN 71-3 (toy safety, migration of certain elements). EN 71-3 is the part of the toy safety series that covers migration of certain elements from toy materials. It tests the material, not the plasticizer molecule, so a plasticizer decision does not by itself pass or fail the standard. What it means in a project is that the finished material has to be submitted to element migration testing, while the plasticizer has to satisfy the separate phthalate restriction entries that apply to toys and childcare articles. A toy dossier therefore needs both strands: an element-migration report on the material and a plasticizer declaration against the applicable restriction list. Confirm the current edition and limits in the standard text for the destination market.
FDA (US food-contact). For the United States, food-contact articles are assessed against the applicable FDA food-contact listings and clearances, and the exact citations, conditions of use and any limitations depend on the composition of the finished material. The practical requirement for a supplier is to provide the CAS number, the purity specification and the extractables or migration data the converter's regulatory team asks for, and for the finished article to be evaluated as a whole rather than by raw-material declaration alone. Always verify the current regulation text rather than a secondary summary.
Both of these are dossier questions rather than grade questions. DINCH being a non-phthalate cyclohexanedicarboxylate is what makes it a candidate; the documentation chain is what qualifies it for a given article and market.
Where DINCH fits in a plasticizer portfolio
DINCH is usually selected when contact safety and low migration are the dominant requirements. In a compounder's portfolio it typically sits alongside three other non-phthalate routes:
- Terephthalates such as DOTP, used broadly where ortho-phthalates are not permitted but contact-safety documentation for medical articles is not the driver.
- Trimellitates such as TOTM, used where the requirement is high-temperature ageing rather than contact safety.
- Aliphatic diesters such as DOA and DOS, used where low-temperature flexibility is the controlling property.
- Epoxidised vegetable oils such as ESBO, used as a secondary plasticizer and heat-stabilising co-additive rather than as the primary plasticizer.
Evaluation checklist before qualification
- Define the target market and the contact scenario, then list the regulations and standards that apply.
- Confirm the grade purity specification and request the batch COA for the intended supply.
- Run the article-level migration or extractables test that the market requires.
- Verify the processing window on the actual line, including any sterilisation step for medical articles.
- Confirm long-term behaviour: storage, light exposure and low-temperature handling of the finished article.
- Archive the document set with the batch references so it can be reproduced at audit.
Frequently asked questions
How does DINCH compare with DOP and DEHP?
DINCH is a non-phthalate cyclohexanedicarboxylate, while DOP and DEHP are ortho-phthalates that are restricted in a growing range of consumer and contact applications and carry a reproductive-toxicity classification in the EU. DINCH also shows a lower migration direction, which is the property that matters most in medical, food-contact and toy articles. The two are not drop-in equivalents: recheck hardness, processing window and article-level migration data after substitution.
Does DINCH satisfy EN 71-3 and FDA requirements?
Not by itself. EN 71-3 covers migration of certain elements from toy materials and is tested on the finished material, while plasticizer restrictions for toys are handled through the separate restriction entries; FDA food-contact compliance depends on the applicable listings for the finished composition. DINCH is a candidate for these applications because of its non-phthalate structure and low migration direction, but the compliance file must be built at article level and verified against the current text of the applicable regulation.
Is DINCH an ortho-phthalate?
No. DINCH belongs to the cyclohexane dicarboxylate family and has a non-phthalate structure, which is why it is used where ortho-phthalates are restricted, including contact applications.
Can DINCH be used for medical tubing?
It is used in medical contact applications such as infusion tubing, subject to the qualification of the finished article. Biocompatibility and sterilisation compatibility are established on the article, and the applicable test scope should be confirmed against the target market before qualification.
What documents are supplied with a DINCH order?
A batch certificate of analysis is provided per delivered lot, and TDS and SDS documents are available on request. Market-specific statements are prepared against the confirmed destination and application.
Support and documentation notice
DOBO New Energy technical materials are provided for engineering evaluation and formulation planning. Final product specifications, TDS and SDS documents, batch certificates of analysis, packaging configurations and regulatory statements are validated per specific commercial order. Contact-application compliance must always be confirmed against the target market and the corresponding test report.
For grade inquiries, technical data sheets and 1 kg sample requests for testing, please contact our technical sales team through the contact page.
Related grade
DINCH · DINCH Medical and Food-Contact Grade Plasticizer
CAS 166412-78-8
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