Factory Melamine Formaldehyde Urea Powder Melamine Moulding Compound Melamine Tableware Raw Material Glazing Powder Low Price

Guidelines for Using Urea Formaldehyde (UF) Moulding Compound:‌

‌1. Material Preparation‌

• ‌Pre-drying‌: If stored in humid conditions, pre-dry the compound to reduce moisture content (typically 1-2 hours at 50-60°C) to avoid defects like blisters or porosity.
• ‌Preheating‌: Pre-heat the material to 70-90°C to improve flow characteristics and reduce cycle times.

‌2. Mold Design‌

• ‌Ventilation‌: Ensure adequate venting in the mold to release gases (e.g., formaldehyde vapor) during curing.
• ‌Surface Finish‌: Use polished or chrome-plated molds to achieve high-gloss surfaces without post-processing.
• ‌Draft Angles‌: Incorporate sufficient draft angles (1–2°) for easy ejection of parts.

‌3. Molding Process‌

• ‌Compression Molding‌:
  • ‌Temperature‌: 130–160°C (mold temperature).
  • ‌Pressure‌: 15–30 MPa (metric ton-force per unit area).
  • ‌Cure Time‌: 0.5–3 minutes per mm of thickness, depending on part geometry.
• ‌Injection Molding‌:
  • ‌Barrel Temperature‌: 80–100°C (avoid exceeding 110°C to prevent premature curing).
  • ‌Injection Pressure‌: 70–120 MPa.
  • ‌Hold Pressure‌: 50–80% of injection pressure.

‌4. Curing‌

• Ensure complete cross-linking by maintaining consistent temperature and pressure during curing.
• Monitor for gas release (formaldehyde vapors) and ensure proper ventilation to avoid porosity.

‌5. Post-Processing‌

• ‌De-flashing‌: Remove excess flash mechanically or via tumbling.
• ‌Annealing‌: For thick-walled parts, anneal at 80–100°C for 1–2 hours to relieve internal stresses.

‌6. Safety & Environmental Measures‌

• ‌Ventilation‌: Use fume extraction systems to minimize exposure to formaldehyde vapors during molding.
• ‌PPE‌: Operators should wear gloves, masks, and eye protection.
• ‌Waste Management‌: Recycle sprues and rejects by grinding and reusing them (up to 10–15% regrind blended with virgin material).

‌7. Key Parameters to Monitor‌

• ‌Moisture Content‌: Keep below 1% to prevent defects.
• ‌Cure Degree‌: Ensure >95% cross-linking via DSC (Differential Scanning Calorimetry) testing.
• ‌Shrinkage‌: Account for 0.6–1.2% linear shrinkage in mold design.

‌8. Troubleshooting Common Issues‌

• ‌Blisters/Porosity‌: Reduce moisture, improve venting, or adjust cure time.
• ‌Warping‌: Optimize cooling rate or anneal post-molding.
• ‌Sticking to Mold‌: Apply mold release agents (e.g., zinc stearate) sparingly.

FAQ

Q1: When will I get an answer?

A: We guarantee your quick response and service. The email will be answered within 12 hours, and your questions will be answered in time.

Q2: Do you provide samples?

A: Yes, we can provide 300g samples free of charge, but you need to pay for the freight.

Q3: How long is the shelf life of the goods?

A: The shelf life of our products is 2 years, which is based on dry and ventilated storage.

Q4: What documents can we provide?

A: Commercial invoice, packing list, bill of lading. The documents will be sent by express within 24 hours after you pay in full.

Q5: When is the delivery time?

A: We usually deliver the goods within 15~30 days after receiving payment from customers.

Contact Us

Michael Lin

WeChat/Phone:13459565408

WhatsApp:+86-13459565408

Email:michael@gufaith.com

Website:www.melamine-powder.com