Purity
Purity is an important first reference, but it should not be the only criterion used when comparing TMDSO suppliers. Buyers should review purity together with reactive content and impurity-related parameters.
Organosilicon Intermediate
TMDSO1,1,3,3-
TMDSO1,1,3,3-Tetramethyldisiloxane
CAS 3277-26-7
A reactive organosilicon intermediate used in silicone synthesis and modification. Buyers evaluating a TMDSO source should review purity together with Si-H content, chloride, residual acidity and commercial-batch consistency.
- Purity ≥99.5%
- Si-H ≥1.39%
- Chloride ≤10 ppm
- Residual Acidity ≤10 ppm
Density at 20 °C: 0.760–0.770 g/cm³
Technical Reference
Product Specification
Use these purchasing specification limits as a comparison basis. They are not presented as the test results of a particular batch.
| Product | 1,1,3,3-Tetramethyldisiloxane |
|---|---|
| CAS | 3277-26-7 |
| Purity | ≥99.5% |
| Si-H content | ≥1.39% |
| Chloride | ≤10 ppm |
| Residual acidity | ≤10 ppm |
| Density at 20 °C | 0.760–0.770 g/cm³ |
Buyer Decision Support
Why These TMDSO Parameters Matter
Si-H Content
Si-H content reflects reactive hydrogen functionality and can be relevant when evaluating TMDSO for synthesis, addition or modification processes.
Chloride
Elevated chloride may create concerns in sensitive downstream synthesis or catalyst systems. Buyers evaluating a new TMDSO source should therefore compare chloride together with purity and Si-H content.
Residual Acidity
Residual acidity may be relevant to material stability and sensitive downstream processing. It should be reviewed together with other quality indicators when qualifying a new source.
Qualification Checklist
TMDSO Buyer Checklist
Before approving a new TMDSO source, confirm:
- Product identity and CAS number
- Purity specification
- Si-H content
- Chloride
- Residual acidity
- Latest batch COA
- Sample evaluation criteria
- Commercial-batch specification
- Packaging
- DG / transport documentation
- Lead time and commercial supply conditions
Compare suppliers on the same technical basis before comparing price.
From Evaluation to Supply
Sample Approved — What Should Buyers Confirm Next?
A successful sample is only one step in supplier qualification.
Specification and COA
Confirm the agreed specification and review the commercial-batch COA.
Packaging and quantity
Confirm packaging, batch quantity and order quantity.
Lead time
Align the required delivery window with the commercial supply plan.
Shipment documents
Confirm DG or transport arrangements and the required documentation.
Application Context
Typical Applications
Hydrosilylation
Reactant for hydrosilylation to prepare functionalized siloxane derivatives.
Silicone intermediates
Intermediate used in the preparation of hydride-functional silicone fluids, silicone resins and specialty organosilicon compounds.
Organic and organosilicon synthesis
Chemical reagent in supported organic and organosilicon synthesis applications.
Application suitability should be verified by the buyer for the specific formulation and process. Review application pathways →
Order Preparation
Packaging & Export Support
Confirmed packaging reference
The current product page confirms 150 kg net per steel drum. Alternative packaging options may be discussed for the actual order and must be confirmed before supply.
Documents buyers can discuss
- Latest batch COA
- SDS
- TDS
- Packaging information
- DG / transport documentation where applicable
Documentation availability may depend on the product, destination and shipment requirements.
Technical Reading
How to Read a TMDSO COA
When comparing TMDSO COAs, purity should be reviewed together with Si-H content, chloride, residual acidity and batch identification.
TMDSO COA Guide
Use a consistent set of specification fields when reviewing a supplier and its latest batch document.
Read the TMDSO COA Guide →Si-H Content Guide
Understand why reactive hydrogen content is reviewed alongside purity and trace parameters.
What Does Si-H Content Tell a TMDSO Buyer? →
Buyer Questions
TMDSO Buyer FAQ
Is TMDSO purity the only quality parameter buyers should compare?
No. Purity is a starting point. Buyers should also compare Si-H content, chloride, residual acidity, batch identification and the agreed commercial-batch specification.
Why is Si-H content relevant when evaluating TMDSO?
Si-H content reflects reactive hydrogen functionality and may be relevant when evaluating the material for the intended synthesis, addition or modification process.
Why should chloride be reviewed in a TMDSO COA?
Elevated chloride may concern sensitive downstream synthesis or catalyst systems, so it should be reviewed with purity and Si-H content.
What should buyers confirm after a TMDSO sample is approved?
Confirm the agreed specification, commercial-batch COA, packaging, order quantity, lead time, shipment arrangement and required documents.
What documents can buyers request before commercial supply?
Buyers can discuss the latest batch COA, SDS, TDS, packaging information and DG or transport documents where applicable. Availability depends on the destination and shipment requirements.
How is TMDSO normally packed?
The current product page confirms 150 kg net per steel drum. Any alternative packaging should be confirmed for the actual order before supply.
What information should be provided when requesting a TMDSO quotation?
Provide the product identity, target specification, required quantity, packaging preference, destination, timeline, application or evaluation requirements and required documents.
Evaluating a TMDSO Source?
Start with the latest available COA, a sample discussion or the specification and shipment requirements for your planned order.