Qiangli Chemical Product Manual (Latest)

Silicone Oil Types for Aluminum Die-Casting Mold Release Agents Long-chain alkylaryl-modified silicone oil is the most commonly used, followed by phenyl silicone oil and general-purpose methyl silicone oil. The selection is based on temperature resistance, carbon deposition, lubrication, and post-coating requirements.

For cleaning spinning heads, low‑viscosity, medium‑low amine value, easily emulsifiable, easily washable, and high‑temperature resistant amino silicone oils are preferred. Qiangli Chemical offers several suitable amino silicone oils, which should be selected based on your cleaning process and spinning system.

For car paint glazing, low to medium amine value amino silicone oil (0.2–0.6 mmol/g) is preferred. High amine value (>1.0 mmol/g) is not suitable for long-term outdoor paint surfaces.

Overview of Core Applications of Ordinary Dimethyl Silicone Oil (300,000–1,000,000 cSt) Dimethyl silicone oil with a viscosity of 300,000 to 1,000,000 cSt is classified as ultra-high viscosity. It features excellent film-forming property, outstanding damping effect, long-lasting lubrication, and high stability, making it irreplaceable in mechanical damping, mold release, electronic sealing, high-end personal care, and other fields.

The emulsion used with rubber sealing rings (mostly silicone‑based emulsion for mold release, lubrication or protection, the most suitable type for this application) must NOT be applied directly as undiluted stock solution.

Dimethyl silicone oil defoamer consists of core active ingredients, auxiliary synergistic ingredients and carrier/emulsification system. Formulations vary slightly among different types (oil-based, emulsion, powder), but the core structure is consistent.

Core rule: The higher the viscosity, the greater the consistency, the denser the film formation, the stronger the lasting performance/mold release capacity, and the poorer the fluidity; 30,000 cSt is of medium-high consistency, balancing fluidity and basic long-acting performance; 50,000 cSt is the golden viscosity in this range, with the optimal comprehensive performance and the widest versatility; 100,000 cSt is of high consistency, focusing on strong mold release and ultra-long-acting film formation/lubrication, suitable for scenarios with high requirements for lasting performance.

Dimethyl silicone oil with a viscosity of 30,000~100,000 cSt is the core commonly used grade of high-viscosity dimethyl silicone oil, featuring high consistency, strong mold release capacity, long-acting lubricity, dense film-forming property, excellent resistance to high and low temperatures (-50~200℃) and low volatility, as well as high chemical inertness. Different from low/mid-viscosity silicone oil which is mainly used for dilution, thin coating and defoaming, it is mainly suitable for industrial and civil scenarios requiring thick film coverage, long-acting performance, anti-adhesion and slip resistance, and strong mold release. It is also the most versatile and practical viscosity grade among high-viscosity silicone oils.

When producing silicone rubber with a Shore D 60 hardness using vinyl silicone oil and hydrogen-containing silicone oil as the crosslinking system, the core selection criteria for vinyl silicone oil lie in controlling its vinyl content (mole fraction/mass fraction) and base viscosity, while matching the hydrogen content and addition ratio of hydrogen-containing silicone oil. It is essential to ensure the crosslinking density is suitable for the crosslinked network requirements of Shore D 60 hardness. Below is a precise and actionable selection scheme, including viscosity, vinyl content, grade references and proportioning principles, applicable to the production process of common addition-cure silicone rubber: