The majority of companies request their suppliers to provide a silicone technical data sheet (TDS) and a stack of compliance certificates. However, not many individuals beyond the materials lab really understand how to read it correctly. The result? Projects are started on the wrong grade, failure to work is noticed only after launch, or questions by the regulators can be raised at the worst possible time.
A silicone material is not safe and appropriate simply because a TDS and a single certificate have been attached to it you must know what it actually says in the documents that have been attached to it. This guide will assist you in doing three practical things, namely quickly identifying the most important fields in any of the silicone material data sheets, turning performance numbers into real project decisions, and knowing what FDA, LFGB, REACH, and RoHS certifications do (or do not) guarantee.
In case you wish to carry the entire process of selecting the correct silicone to use in your specific application, our silicone material selection guide walks through how specifications fit into the bigger picture.
Why TDS and Certificates Matter More Than Many Teams Think
With silicone components, submitting a TDS and a certificate is not difficult, knowing how to interpret them to make a good decision is.
When teams are only guided by price and physical samples, the following common problems follow: the part will feel too soft or too hard in actual assembly, the part will permanently set after a few heat-cycles, or the part will fail an audit of food-contact or skin-contact a few months later. These problems tend to have their origins traced back to one line that was ignored in the TDS or a certificate that was never compared with the exact grade being used.
In the conversation, early, preferably during design or sourcing, bringing the TDS and certificates into the conversation prevents those surprises. The distinction is evident:
| Approach | Likely Outcome |
| Price + sample only | Higher risk of failures and compliance surprises |
| TDS + certificates + tests | Better match between material and application |
What You Should Expect to Find in a Silicone TDS
An excellent silicone technical data sheet is not a marketing brochure. It is a technical reference, structured into distinct blocks: material identification, physical properties, thermal characteristics, processing notes and safety/approval information.
The two areas that most selection decisions are the physical and thermal properties. All the other details such as color, shelf life or general statements are known as supporting detail.
The following are the areas you will tend to encounter most and their significance:
| TDS Section / Field | What It Tells You | Why It Matters for Selection |
| Grade / product name | Exact material identification | Avoids mixing similar but different grades |
| Hardness (Shore A) | Stiffness / softness of the rubber | Fit with design feel and sealing requirements |
| Tensile strength | Strength before breaking | Resistance to tearing and stretching |
| Elongation at break | How far it can stretch before failure | Flexibility and robustness in flexing parts |
| Compression set | Permanent deformation after compression | Long-term sealing and recovery performance |
| Specific gravity / density | Material weight and formulation density | Weight, feel, and sometimes filler content |
| Recommended temperature range | Typical operating limits | Safe use in hot/cold environments |
| Cure system | Peroxide vs platinum cure, etc. | Impacts odor, color, and some approvals |
All the figures in these columns must be consulted, not in isolation, with what you are really applying.
How to Read the Key Performance Numbers (Without Getting Lost)
Laboratory information of a TDS is produced under controlled conditions. There is almost no case when real-world performance is the same. The best solution is to take all the values as starting points and question them on how they behave under your specific temperature, time and environmental conditions.
The most misinterpretations are made by a few numbers. Here is the way that experienced engineers will read them more closely:
| Property | Typical Trap in Reading | How to Read It More Safely |
| Hardness | Only check the number, ignore tolerance range | Ask about tolerance and batch-to-batch variation |
| Temperature range | Assume “listed max °C” is safe for all situations | Distinguish continuous vs peak exposure and apply a safety margin |
| Compression set | Ignore test time and temperature conditions | Compare values tested under conditions close to your use case |
| Elongation at break | Treat high elongation as always better | Balance it against hardness, tear strength, and actual design geometry |
One real-life example: a kitchen utensil was to be made out of a material rated at 230 C. The part worked well during short-term testing in an oven but hardened and cracked after repeated use at a temperature of 180 C since the TDS did not specify the maximum operating temperature, but the maximum allowed temperature. The problem would have been avoided by reading the fine print and adding a safety margin of 20 per cent.
Certificates and Test Reports: What FDA, LFGB, REACH and RoHS Actually Mean
Certificates do not constitute safety blanket stamps. Each document covers one particular regulatory issue, and only applies to the formulation, color, and conditions under test.
- The FDA (21 CFR 177.2600) is concerned with food-contact safety of rubber articles in the US.
- LFGB The German/EU food-contact standard, which in many cases is more restrictive regarding extractables and migration.
- REACH is the management of chemical substances, which limits Substances of Very High Concern (SVHC) to the European market.
- RoHS restricts the use of dangerous chemicals like lead, cadmium, and some flame retardants, mostly used in electronics and electrical components.
The fact that one report has passed does not imply that the material can be used in all colors, all processing methods and all possible end-uses. Always ensure that the certificate states the specific grade and color that you intend to purchase.
| Certificate / Standard | What It Primarily Covers | Typical Use Cases / Focus |
| FDA (e.g. 21 CFR 177.2600) | Food-contact safety for rubber articles | Repeated food-contact silicone products |
| LFGB | Food-contact safety in EU/Germany | Kitchenware, bakeware, food-contact items |
| REACH | Chemicals and SVHC restrictions | General market entry in EU |
| RoHS | Restriction of hazardous substances | Electronics, electrical and some components |
How to Match TDS Data with Certificates for a Specific Project
Do not consider the TDS and certificates as different documents. Compare them with your project requirements.
When it comes to any new material, make sure to confirm three things: the TDS grade of the material is exactly the same as the certificate, the test conditions in the reports are identical to the conditions of your operation, and the approvals cover the intended contact type (food, skin, infant, etc.).
An example of a practical mapping is shown below:
| Project Question | What to Check on TDS | What to Check in Certificates |
| Is this grade safe for food-contact? | Cure system, additives, temperature range | FDA / LFGB reports, test scope and limits |
| Will it survive my temperature profile? | Recommended temperature range, compression set | Not usually in certificates — rely on TDS + testing |
| Is hardness and feel appropriate? | Shore A hardness, tolerance | Not a certificate topic |
| Is it allowed in EU / US markets? | REACH / RoHS mention (if any) | REACH SVHC, RoHS, and relevant declarations |
If you are working on food-contact or baby products, you may also want to explore what food-grade silicone actually means in greater depth.
Red Flags and Missing Information in Silicone TDS and Certificates
Some of the details at a glance are the ones that indicate that there are more questions which should be asked.
Some of the red flags are:
- The TDS has no revision date or version number.
- A certificate not including the specific material grade or colour.
- Absence of laboratory name or reference of original test report.
You see them, use them as reminders to request the supplier to provide you with updated or more specific documentation instead of assuming everything is fine.
| Red Flag | Why It Is a Problem | What You Should Do |
| No date or version on TDS | Cannot tell if data is current | Ask for latest, version-controlled TDS |
| Certificate without material grade | Hard to match to your specific product | Request certificate that lists exact grade |
| No test lab or report reference | Hard to verify authenticity and scope | Ask for original test report or lab details |
Practical Checklist: How to Review Silicone TDS and Certificates Before Approving a Material
This five step checklist should be used on each occasion you test a new grade of silicone. It can be done in a few minutes and helps to avoid the majority of downstream issues.
- Confirm material identity — Check that the grade, color and version in the TDS is the same as the certificate, and the sample you received.
- Examine important areas of performance – Concentrate on hardness, temperature range, compression set, tensile strength and elongation.
- Confirm regulatory coverage – Certify FDA, LFGB, REACH or RoHS certificates to your target markets and contact type.
- Check dates and references — Ensure that the documents are up-to-date and that they can be traced to a reputed lab.
- Plan further validation when necessary – Decision whether prototype testing or pilot runs are necessary.
| Step | What to Verify | Why It Matters |
| 1 | Material grade, color, version | Ensures you are looking at the right material |
| 2 | Key performance fields on TDS | Checks basic suitability for your design |
| 3 | FDA/LFGB/REACH/RoHS coverage and scope | Confirms regulatory fit for target markets |
| 4 | Dates, labs, and report references | Helps evaluate recency and credibility |
| 5 | Need for additional testing or trials | Bridges gap between lab data and real use |
For projects that move beyond paperwork, how to validate your silicone material choice offers a clear framework for testing and pilot runs. Many teams also keep a silicone compliance checklist for food-contact and skin-contact products handy to stay organized.
Conclusion — Specifications Are Tools, Not Formalities
The presence of a TDS and certificates on file is just a start. The actual worth is in reading them properly, posing the proper follow-up questions and correlating the information with your actual usage.
Ensure that you make reviewing specifications a routine part of your design and sourcing process. In the long run, such a practice will minimize risk, reduce development cycles, and allow you to feel much more confident about every silicone component you put on shelves in the market. The papers are a decision tool – apply it as such, and it will work well with you.
