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High crystallinity enabling rapid melt-solidification and excellent dimensional stability.
Outstanding thermal resistance with continuous use temperature up to 180 °C.
Low moisture absorption (<0.2% at 23 °C, 50% RH), ensuring consistent processing and end-product reliability.
Excellent chemical resistance to hydrocarbons, alcohols, and weak acids.
Good flow characteristics for precision injection molding of thin-walled components.
Automotive under-hood components including sensor housings and connector bodies.
Electrical and electronic parts such as terminal blocks, relay bases, and fuse holders.
Industrial pump and valve components requiring long-term thermal and chemical exposure resistance.
Consumer appliance housings exposed to elevated ambient temperatures (e.g., coffee makers, air fryers).
| Chemical Type | Crytalline aromatic polyester |
| Product Form | Pellets |
| Appearance | Off-white to pale yellow granules |
| Melt Temperature (DSC) | 255–265 °C |
| Relative Viscosity (0.5 g/dL in phenol/tetrachloroethane, 25 °C) | 1.4–1.6 |
| Density (ASTM D792) | 1.32–1.35 g/cm³ |
| Moisture Content (ASTM D6980) | ≤0.05 wt% |
| Primary Applications | High-temperature structural components requiring dimensional integrity and chemical resistance |
Q1: What is the primary functional role of GM-920 in powder coating formulations?
A: GM-920 serves as a crystalline polyester resin designed to enhance flow and leveling while contributing to rapid melt viscosity reduction during curing. Its well-defined crystallinity supports improved storage stability in powder blends and enables consistent film formation at lower processing temperatures compared to many amorphous alternatives.
Q2: How does GM-920 differ from conventional amorphous polyesters used in thermosetting powder coatings?
A: Unlike amorphous polyesters, GM-920 exhibits sharp melting behavior due to its crystalline structure, resulting in a more predictable and narrow melt window. This characteristic allows for tighter control over melt rheology and reduces sagging tendencies on vertical substrates, particularly in high-gloss or smooth-finish applications.
Q3: Is GM-920 compatible with standard epoxy-based crosslinkers commonly used in hybrid powder systems?
A: Yes, GM-920 is formulated to be compatible with conventional glycidyl-functional epoxy resins and other widely used crosslinkers in hybrid (epoxy-polyester) systems. It demonstrates good reactivity and cure response under typical powder coating bake schedules, supporting balanced mechanical properties and chemical resistance.
Q4: What handling precautions should be observed during storage and processing?
A: Due to its crystalline nature, GM-920 should be stored in cool, dry conditions away from direct heat sources to prevent unintended partial melting or agglomeration. During extrusion and milling, thermal history should be carefully managed to avoid premature crystallization disruption, which may affect downstream rheological consistency.
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