Recently, domestic special organosilicon material‑ethyl silicone oil (poly diethylsiloxane, CAS: 63148‑61‑8) has achieved stable mass‑production of high‑purity, low‑cyclic‑residue grades after technical optimization. It is widely applied in aerospace, polar‑region equipment, cold‑climate wind power, precision instruments and electrical insulation sectors. Rising technical and purchasing inquiries drive the release of this public FAQ for buyers, technicians and foreign‑trade partners.

1. Basic Product Information

• Full Name: Ethyl Silicone Oil, Poly Diethylsiloxane
• CAS No.: 63148‑61‑8
• Specification Reference: GJB 8726‑2015, GB/T 16483
• Key Properties: Excellent low‑temperature resistance, low volatility, electrical insulation, chemical inertness, good compatibility with mineral oils
• Main Applications: Lubricant for extreme‑cold equipment, aerospace low‑temperature medium, wind‑power gear additive, precision instrument oil, insulation impregnating agent, special plasticizer for rubber

2. Main Physical‑Chemical Parameters

• Appearance: Colorless to pale yellow transparent liquid, free of mechanical impurities
• Kinematic Viscosity (25 °C): Standard grade 34‑40 cst; custom range 10‑100000 cst available
• Pour Point: ≤‑70 °C; modified premium grade down to ‑100 °C
• Open‑cup Flash Point: ＞170 °C; high‑flash‑point grade ＞265 °C
• Density (20 °C): 0.95‑1.02 g/cm³
• Operating Temperature Range: ‑60 °C ~ 150 °C
• Impurity Control: Low cyclic siloxane residues, compliant with EU chemical regulatory requirements

3. Latest Industry Developments

1. Process Upgrade: Continuous polymerization combined with short‑path molecular distillation reduces cyclic siloxane impurities and delivers narrow molecular‑weight distribution, suitable for high‑end industrial and export markets.
2. Localization Progress: High‑performance ethyl silicone oil previously relied heavily on imports. New domestic production lines ease supply‑chain pressure for aerospace and polar‑region equipment projects.
3. Compliance Improvement: COA and MSDS/SDS documents are available to satisfy global chemical regulations and support export shipments.
4. Product Portfolio: Industrial lubricant grade, low‑temp instrument grade, high‑purity electronic grade, military‑spec insulation grade. Custom ethyl content and viscosity upon request.

4. Frequently Asked Questions (FAQ)

Q1: What is the main difference between ethyl silicone oil and conventional methyl silicone oil? A: Ethyl silicone oil features outstanding low‑temperature performance and remains fluid below ‑70 °C. It shows better compatibility with mineral oils. However its high‑temperature resistance is inferior to methyl silicone oil. It is preferred for extreme‑cold lubrication and instrument oil rather than long‑term service above 200 °C.

Q2: Can ethyl silicone oil be directly used as gear lubricant? A: It works as base stock for formulating low‑temperature gear oil. Direct standalone use for heavy‑load gears is not recommended. Anti‑wear additives need to be compounded for heavy‑duty conditions; formulation support can be provided.

Q3: What are storage requirements and shelf life? A: Keep containers tightly closed in cool, well‑ventilated areas and avoid direct sunlight. Shelf life for unopened original packaging is 24 months. Use promptly after opening and prevent contamination by moisture and particulates.

Q4: Which documents are required for export? A: Certificate of Analysis (COA) and MSDS/SDS are supplied. Additional chemical‑declaration documents can be prepared according to destination‑country requirements.

Q5: Are samples available? What is the MOQ? A: Test samples from 100 ml to 1 L are offered. Bulk packages: 25 L, 200 L steel drums. Custom grades require specific production lead‑time.

Q6: Will ethyl silicone oil cause corrosion to rubber or plastics? A: It is chemically inert towards most nitrile rubber, fluoro‑rubber and engineering plastics with negligible corrosion. Small‑scale compatibility testing is strongly suggested before formal application.

Q7: Can cyclic‑siloxane residues be controlled to meet EU restrictions? A: High‑purity grades processed by molecular distillation maintain low D4/D5 levels to satisfy EU regulations. Standard industrial grades have relatively higher cyclic content; please specify grade while placing orders.

5. Market Outlook

Demand for low‑temperature specialty chemicals keeps growing, driven by cold‑climate wind power, polar exploration and commercial aerospace. Ethyl silicone oil remains an irreplaceable low‑temperature organosilicon material. Future industry directions cover low‑cyclic green synthesis, modified composite formulations and customised solutions, with continuously expanding domestic market share.