Low Melting Point Glass Powder For Coatings
Why Is Low Melting Point Glass Powder Essential in High-Temperature Silicone Coatings?
If you've worked with high-temperature silicone coatings, you've likely encountered low melting point glass powder in the formulation. But why is it such a critical ingredient? Let's explore this question by analyzing a waterborne high-temperature silicone coating recipe, uncovering the pivotal role low melting point glass powder plays.
Price: USD $7.9/KG
What Are High-Temperature Coatings?
High-temperature coatings are specialized functional coatings designed to withstand prolonged exposure to temperatures exceeding 380°C while maintaining physical and chemical integrity. These coatings are used on substrates like iron, steel, aluminum, ceramics, and glass, making them indispensable in industries such as metallurgy, petroleum, natural gas, and aerospace.
In addition to their heat resistance, these coatings offer durability against abrasion and impact. By modifying the surface of metals or refractory materials, they enhance the performance of base materials, save energy, and extend the lifespan of metal substrates by 1–2 times.
The Technology Behind High-Temperature Silicone Coatings
One standout material is the heat-resistant resin derived from alkoxy-functional silicone oligomers, such as SIOResin SIO-715. Built around a polysiloxane backbone, this resin exhibits exceptional thermal stability due to the high bond energy of the silicon-oxygen (Si-O) bond.
Using this resin, a single-component, room-temperature-curable silicone coating can be formulated, capable of withstanding temperatures as high as 1200°C.
Black High-Temperature Coating Formulation
Here’s a starting formulation for a waterborne high-temperature silicone resin coating:
Black Pigment Slurry
Processing Steps
- 1. Add defoamer, antisettling agents, and dispersant into deionized water. Stir at 1000 rpm for 5 minutes.
- 2. Gradually add copper chromite black, mica powder, low melting point glass powder, and zinc phosphate. Increase stirring speed to 2000–3000 rpm and mix for 45 minutes.
Black High-Temperature Coating Formulation
The Role of Low Melting Point Glass Powder
Silicone resins whether phenyl or methyl-based—cure through hydrolysis and condensation of silanol or alkoxy groups. At elevated temperatures, the organic groups in the resin degrade, leaving a porous silica (SiO₂) structure.
Adding low melting point glass powder addresses this issue. As the temperature reaches the glass powder's melting point, the powder melts and fills the voids left by the decomposed organic groups. It reinforces adhesion between pigments and fillers, forming a "secondary layer" that enhances thermal insulation and corrosion protection for the substrate.
Is Low Melting Point Glass Powder Environmentally Friendly?
Yes, all low melting point glass powder used in these formulations is lead-free. Since the formation of the Global Alliance to Eliminate Lead Paint in 2011, lead-containing products have been banned worldwide as of 2020.
Manufacturers must ensure compliance with safety and environmental standards, providing RoHS test reports to guarantee the absence of hazardous substances. Lead poisoning is entirely preventable, and responsible sourcing of raw materials is a key step.
Do We Produce Low Melting Point Glass Powder?
While we do not manufacture low melting point glass powder, as a trusted supplier of eco-friendly resin materials, we often assist customers in sourcing high-quality, cost-effective, lead-free glass powder. If you need assistance, feel free to reach out to our sales team.
Let us help you achieve superior high-temperature coatings that combine safety, performance, and environmental responsibility.
About SIOResin
SIOResin(Guangzhou SIO New Material) is a leading manufacture specializing in developping sustainable products and technologies in new material field. We provide professional solutions regarding water-based polyurethane, water-based acrylic resin, water-based UV-curing resin, silicone resin, polyethylenimine (PEI), polysilazane resin, additives and curing Agents etc., which have been widely applied in various industries, such as coatings, cosmetics, textiles, biology, automotive and other high-tech industries.
Please feel free to contact us via Email sales@sioresin.com if you would like to learn more about our products or request samples!