Many heat transfer fluid inquiries start with a model name. A buyer may ask whether a certain heat transfer fluid is available, whether it can replace the product currently in use, what the price is, or whether there is a similar grade.
These questions may look like a simple quotation request. For a formal RFQ, however, a model name alone is not enough. This is especially true for high-temperature heat transfer fluids, synthetic thermal oils and replacement cases in existing systems. If TDS, SDS, COA and Typical Properties are not checked first, important operating risks may be missed and the technical discussion may have to be repeated later.
TDS, or Technical Data Sheet, is usually the first document used to understand the basic performance of a product. It normally lists typical technical data such as kinematic viscosity, density, flash point, pour point, maximum use temperature, recommended operating range, thermal stability or suitable system type.
Buyers do not read a TDS only to confirm that the product is a heat transfer fluid. They use it to judge whether the fluid may fit their temperature range, equipment conditions and operating mode. Two products used in heat transfer systems may still differ significantly in maximum temperature, low-temperature fluidity, flash point and viscosity behavior. If the selection is based only on a similar model name, without checking the TDS, the conclusion is not reliable enough.
SDS, or Safety Data Sheet, is mainly used for safety, storage, transportation and compliance review. Many buyers request an SDS during the RFQ stage not only for filing, but also to confirm whether the product can meet internal requirements for transport, warehousing, site operation, personal protection and regulatory compliance.
An SDS usually includes hazard identification, composition information, first-aid measures, firefighting measures, accidental release measures, handling and storage, exposure control, personal protection, stability, toxicological information and transport information. For cross-border trade, plant procurement and end-user approval, the SDS can be an important document in the supplier evaluation process.
COA, or Certificate of Analysis, reflects test results for a specific batch. A TDS gives typical values or ranges, while a COA gives measured data for a particular batch. These two documents should not be treated as the same thing.
If the buyer is purchasing stock or confirming batch consistency, the COA should be checked against the contract, technical agreement or internal quality requirements. Viscosity, density, flash point, water content, acid value and appearance may become key acceptance items. For suppliers, preparing the COA early also helps reduce quality concerns before and after order placement.
Typical Properties help buyers understand the normal performance boundaries of a product. They may overlap with the TDS, but they are very useful in real communication because buyers need to place typical data into their own operating conditions.
For example, what is the long-term operating temperature of the system? Is it close to the recommended upper limit? Is the start-up temperature low? Does the buyer need to consider low-temperature pumpability? Is the system exposed to long-term high temperature, intermittent operation, frequent start-stop cycles or local overheating? These questions cannot be answered by a model name alone. They need to be reviewed together with typical performance data.
Before an RFQ, document review and operating condition review should be handled together. A model name only shows which product or replacement direction the buyer is considering. It does not prove that the product is suitable for the actual system.
Sales and technical teams should at least confirm whether the project is a new system selection, top-up, replacement or full oil change; what the system capacity is; what the normal operating temperature, outlet temperature and maximum temperature are; what equipment is involved; whether there is an expansion tank; whether the system runs at high temperature for long periods; and whether there have been problems such as coking, slow heating, lower heat transfer efficiency, dark oil color or abnormal pump pressure.
If this information is missing, the quotation is only a price response, not a complete technical response.
This step is particularly important for replacement inquiries. Some buyers ask whether a certain international brand grade can be replaced, or whether products such as T66 or S750 can be used in an existing system. Replacement judgment should not be based only on similar maximum temperature or on the fact that both products are synthetic heat transfer fluids.
Base fluid chemistry, viscosity range, flash point, thermal stability, system cleanliness, used oil condition and mixing risk should also be reviewed. If the buyer plans to top up an old system, the team should judge whether mixing is acceptable. If the buyer plans a full oil change, cleaning, replacement ratio, shutdown window and follow-up oil analysis should also be considered. The earlier these documents and conditions are checked, the lower the risk of technical deviation during quotation.
A more reliable RFQ process should include five steps. First, confirm whether the inquiry is for a new system, top-up, replacement or full oil change. Second, collect the target model, current fluid information, TDS, SDS, COA or the buyer’s technical requirements. Third, compare key performance data with the operating conditions. Fourth, identify high-temperature, coking, mixing, aging or compliance risks. Fifth, decide the recommended product, quotation basis and technical notes to include.
This process may require a few more questions at the beginning, but it can significantly improve inquiry quality. It also helps move the buyer from asking only for price to providing the documents and operating conditions needed for a professional RFQ.
For sales teams, TDS, SDS, COA and Typical Properties are not just attachments. They are key tools in the RFQ conversion process. TDS supports product suitability review, SDS supports safety and compliance review, COA supports batch quality confirmation, and Typical Properties help buyers understand performance boundaries.
Only when these documents are reviewed together with real operating conditions can the supplier provide a more professional, traceable quotation and technical recommendation. This reduces unnecessary back-and-forth communication and shows the buyer that the supplier understands system operation, instead of simply quoting a price based on one model name.
