NSF‐350cSt Pure Silicone Fluid NSF H1 Food Grade
| Chemical Name: | Linear Polydimethylsiloxane (PDMS Silicone) |
| Product Category: | Pure Silicone Fluids – Silicone Fluids |
| Structural Formula: |  |
| CAS No.: | 63148-62-9 |
| EINECS: | 203-492-7 |
| Molecular Formula: | C₆H₁₈OSi₂ |
| Molecular Weight: | 162.38 g/mol |
Product Overview
Silico® NSF H1 350 cSt Pure Silicone Fluid is a high-purity linear polydimethylsiloxane (PDMS) silicone fluid with a nominal kinematic viscosity of 350 cSt at 25°C. It is designed for lubrication, release and surface-treatment applications in food-processing environments where incidental food contact may occur.
The product combines the low surface tension, chemical stability and thermal stability typical of PDMS silicone fluids with an NSF H1 food-grade lubricant classification. NSF H1 is intended for lubricants used in and around food-processing areas where incidental food contact is possible.
Important: NSF H1 refers to incidental food contact. It does not mean the silicone fluid is intended for unrestricted direct addition to food.
Product Specifications
| Property | Typical Value |
|---|---|
| Product Name | Silico® NSF H1 350 cSt Pure Silicone Fluid |
| Chemical Type | Linear Polydimethylsiloxane (PDMS) |
| CAS No. | 63148-62-9 |
| Viscosity @ 25°C | 350 cSt |
| Appearance | Clear, colorless liquid |
| Odor | Odorless |
| Density @ 25°C | Approx. 0.97 g/cm³ |
| Refractive Index @ 25°C | Approx. 1.403 |
| Surface Tension | Approx. 21 mN/m |
| Flash Point | >300°C |
| Pour Point | Approx. −50°C |
| Water Solubility | Insoluble |
| Food-Grade Classification | NSF H1 |
| Main Polymer | PDMS |
Key Properties
350 cSt PDMS Viscosity
Low Surface Tension
With a typical surface tension of approximately 21 mN/m, the fluid spreads readily over many metal, plastic and other equipment surfaces.
This property is useful for:- Surface lubrication
- Mold and release applications
- Anti-stick treatment
- Conveyor lubrication
- Surface conditioning
Thermal Stability
PDMS silicone fluids have good thermal stability over a broad operating range. Silico® 350 cSt silicone fluid is therefore suitable for selected food-processing applications involving elevated or changing temperatures, provided that the actual operating conditions are within the product specification.
Chemical Stability
PDMS is chemically stable toward many commonly used equipment materials. The 350 cSt grade can be considered for applications involving stainless steel, aluminum, plastics and selected elastomers.
Material compatibility should be checked before long-term use, particularly with seals and rubber components.
NSF H1 Food-Grade Lubricant
NSF H1 identifies lubricants intended for use in food-processing environments where incidental food contact may occur. NSF distinguishes H1 lubricants from H2 products, which are intended for applications where food contact is not permitted.
For food-processing equipment, H1 lubricants may be used in applications such as:- Machine parts and equipment
- Conveyors and guides
- Bearings and selected moving components
- Valves
- Packaging machinery
- Gaskets and seals
- Release applications
The lubricant should be applied at the minimum amount necessary to achieve the required technical effect, consistent with good manufacturing practice and the specific application.
Applications
Food Processing Equipment
- Conveyors
- Guides and sliding surfaces
- Packaging machines
- Filling and bottling equipment
- Valves
- Selected bearings
- Processing equipment
Release and Anti-Stick Applications
- Mold release applications
- Processing trays
- Gaskets and seals
- Food-processing surfaces
- Packaging equipment
Surface Treatment
The combination of low surface tension and hydrophobicity allows 350 cSt PDMS to form a thin silicone film on suitable surfaces.
It can be considered for:- Surface conditioning
- Anti-stick treatment
- Water-repellent treatment
- Equipment surface lubrication
Food-Contact and Regulatory Information
For food-processing lubricant applications, 21 CFR 178.3570 is an important U.S. regulatory reference for lubricants with incidental food contact. The FDA Food Code specifies that lubricants used on food-contact surfaces, or on bearings and gears where lubricant may enter food or contact surfaces, must meet the requirements of 21 CFR 178.3570.
Therefore, product claims should be understood according to the specific intended use, formulation, dosage and contact conditions.
A more accurate technical description is:
NSF H1 food-grade silicone fluid for applications where incidental food contact may occur.
It should not be described as unrestricted “direct food contact silicone oil” or as being approved for every food application.
Technical Advantages of 350 cSt
| Characteristic | Practical Benefit |
|---|---|
| 350 cSt viscosity | Balance between flow and film retention |
| Low surface tension | Good spreading and surface coverage |
| PDMS polymer | Chemical and thermal stability |
| Clear, colorless appearance | Suitable for applications requiring clean appearance |
| Water insolubility | Useful for hydrophobic surface treatment |
| High flash point | Suitable for selected higher-temperature applications |
| NSF H1 classification | Designed for incidental food-contact lubricant applications |
Storage and Handling
- Keep containers tightly closed.
- Store in a cool, dry and clean area.
- Protect from contamination and direct sunlight.
- Use clean equipment when transferring the product.
- Avoid unnecessary exposure to moisture and foreign materials.
- Refer to the latest SDS for detailed safety and handling information.
Quality Documentation
- Technical Data Sheet (TDS)
- Safety Data Sheet (SDS)
- Certificate of Analysis (CoA)
- Product specification
- NSF-related documentation
- Packaging information
View product specs:
Packaging Specifications
Frequently Asked Questions
NSF H1 350 cSt silicone fluid is a PDMS-based silicone fluid with a nominal viscosity of 350 cSt at 25°C, intended for lubricant applications where incidental food contact may occur.
It is used for selected food-processing equipment lubrication, release, anti-stick and surface-treatment applications.
Silico® NSF H1 350 cSt is classified for NSF H1 food-grade lubricant applications. H1 means incidental food contact; it does not mean unrestricted direct food use.
Its nominal kinematic viscosity is 350 cSt at 25°C, equivalent to approximately 350 mm²/s.
The commonly used CAS number for polydimethylsiloxane is 63148-62-9.
No. PDMS silicone fluids are generally insoluble in water and have hydrophobic surface characteristics.
350 cSt silicone oil flows more easily and provides a balance between spreading and film retention. 1,000 cSt is more viscous and generally provides a thicker, more persistent film. The appropriate viscosity depends on the equipment and application method.
Compatibility should be tested before use. Silicone fluids may cause dimensional or mechanical changes in some elastomer formulations, so the specific O-ring material should be evaluated before long-term service.
No. NSF H1 is a category for lubricants with incidental food contact. It should not be interpreted as unrestricted approval for direct food addition or every food-contact application.
Jessica G.
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Why Choose Silico® 350 cSt Food Grade Pure Silicone Fluid
Silico® 350 cSt Food Grade Pure Silicone Fluid is a high-purity linear PDMS silicone fluid designed for food-processing lubrication, release and surface-treatment applications.
- 350 cSt @ 25°C — balanced flow and film retention.
- High-purity PDMS — good thermal and chemical stability.
- Low surface tension (~21 mN/m) — supports effective spreading and release.
- NSF H1 food-grade application — suitable where incidental food contact may occur.
- Consistent quality — supplied with TDS, SDS and CoA documentation.
