Heptamethyltrisiloxane
Heptamethyltrisiloxane

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Quality Standards for Heptamethyltrisiloxane: Key Parameters and Applications

Heptamethyltrisiloxane (CAS 1873-88-7), a critical silicone intermediate, is widely utilized in industries ranging from personal care to agricultural additives. Its quality standards are paramount to ensure performance, safety, and regulatory compliance. Below is a detailed breakdown of its essential specifications, testing methods, and industry applications, supported by authoritative guidelines and supplier practices.


1. Core Technical Specifications

Heptamethyltrisiloxane’s quality is defined by its chemical purity, physical properties, and safety profile. Key parameters include:

  • Chemical Purity: ≥99% (GC analysis), ensuring minimal impurities like octamethylcyclotetrasiloxane (≤0.1%) .
  • Physical Properties:
    • Appearance: Colorless transparent liquid.
    • Boiling Point: 142°C (lit.) .
    • Density: 0.81–0.82 g/mL at 25°C .
    • Flash Point: 27.8°C (closed cup), classifying it as a flammable liquid (UN 1993) .
  • Acid Content: Free acid (as HCl) ≤3 μg/g, critical for stability in downstream applications .

These standards align with international guidelines such as GB/T 35501-2017 and T/FSI 112-2023, which mandate rigorous testing for industrial and pharmaceutical uses .


2. Testing Methods and Quality Control

To verify compliance, manufacturers employ standardized protocols:

  • Gas Chromatography (GC)​: Confirms purity and detects impurities like 1,1,1,3,5,7,7,7-octamethyltetrasiloxane .
  • Refractive Index: Measured at 25°C (1.382–1.383), ensuring molecular consistency .
  • Viscosity Testing: At 25°C, viscosity should be ≤2 mm²/s to meet industrial specifications .
  • Safety Compliance: Adherence to GHS guidelines (H315, H319, H335) for skin/eye irritation and respiratory hazards .

Leading suppliers like Jiangsu Ranbao and Zhejiang Runhe Chemical adhere to these protocols, ensuring batch-to-batch reliability .


3. Applications and Industry-Specific Requirements

Heptamethyltrisiloxane serves as a building block in diverse sectors:

  • Personal Care: Enhances silicone surfactants for smooth, silky textures in cosmetics .
  • Agriculture: Forms water-repellent coatings for crops, improving pesticide efficacy .
  • Coatings & Polymers: Modifies polyurethane foams and creates UV-resistant finishes .

Each application demands tailored purity levels. For instance, pharmaceutical-grade heptamethyltrisiloxane requires USP/NF compliance, while industrial grades prioritize cost-effectiveness .


4. Packaging and Storage Best Practices

Proper handling ensures product integrity:

  • Packaging: Available in 150kg/200L drums or 800kg IBC drums, sealed to prevent contamination .
  • Storage: Store in cool, dry conditions (<15°C) away from acids, bases, and direct sunlight .
  • Transport: Follow UN 1993 guidelines for flammable liquids, using explosion-proof containers .

5. Why Choose Biyuan for Heptamethyltrisiloxane?​

Biyuan Chemical stands out as a trusted supplier, combining technical expertise with sustainable practices:

  • High-Purity Production: Our heptamethyltrisiloxane meets USP and EU Pharmacopeia standards, validated by third-party labs .
  • Custom Solutions: Offer tailored packaging (e.g., 50kg bags for labs, 1-ton IBCs for bulk orders) .
  • Global Compliance: Certifications include ISO 9001, REACH, and FDA, ensuring seamless market access .

For industries prioritizing quality and scalability, Biyuan delivers reliable heptamethyltrisiloxane to elevate product performance and regulatory adherence.


Conclusion

Heptamethyltrisiloxane’s quality standards hinge on stringent testing, precise specifications, and responsible handling. Whether in cosmetics or agrochemicals, partnering with a certified supplier like Biyuan ensures optimal results. Explore our product catalog today to meet your industrial and regulatory needs.

Note: For detailed certificates or sourcing inquiries, contact Biyuan Chemical’s technical team at [email protected].

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