Molding Defects & Fixes

Unmelted Pellets in Parts: Why Is the Melt Leaving Solid Lumps Behind?

September 2, 2026
Last updated: 2026-09-04 · 5 min read Unmelted Pellets in Parts: Why Is the Melt Leaving Solid Lumps Behind? Unmelted…
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Color Streaks in Injection Molding: Why Masterbatch Dispersion Decides Your Surface

September 2, 2026
Last updated: 2026-09-04 · 5 min read Color Streaks in Injection Molding: Why Masterbatch Dispersion Decides Your Surface Color streaks…
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Why Is Your Mold Sweating? — Condensation Defects and the Dew-Point Discipline That Fixes Them

September 2, 2026
Last updated: 2026-09-04 · 5 min read Why Is Your Mold Sweating? — Condensation Defects and the Dew-Point Discipline That…
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Why Weigh Parts on the Floor? — Shot Weight as the Fastest Early-Warning Gauge in Molding

September 2, 2026
Last updated: 2026-09-04 · 5 min read Why Weigh Parts on the Floor? — Shot Weight as the Fastest Early-Warning…
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Why Do Molded Parts Crack After Shipment With No External Load? — Environmental Stress Cracking Explained

September 2, 2026
Last updated: 2026-09-04 · 6 min read When Does Nylon 12 Beat Nylon 6 and 6/6? — PA12 for Molded…
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Why Thick Ribs Sink and Bosses Void — Sink Marks, Vacuum Voids and Thick-Section Cooling

September 2, 2026
Last updated: 2026-09-04 · 6 min read Can You Mold Post-Consumer Recycled Resin? — Where PCR Content Holds Up and…
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Why Does My Part Fill Only Partway? — Telling a Short Shot from Hesitation and Fixing Each

September 2, 2026
Last updated: 2026-09-04 · 6 min read TPE vs TPU for Soft-Touch Parts — Which Elastic Material Should You Mold,…
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Weld Lines and Knit Lines in Injection Molding — Why Do Two Flow Fronts Meet Weakly, and How Do You Move or Strengthen the Join?

September 2, 2026
PA6 vs PA66 Nylon for Molded Parts — Which Absorption, Strength, Temperature and Cost Profile Fits Your Part? Last updated:…
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Silver Streaks and Splay in Injection Molding — What Causes the Fine Silvery Lines That Radiate from the Gate, and How Do You Separate Moisture, Degradation and Air from Contamination?

September 2, 2026
Filled Polypropylene — What Do Talc, Calcium Carbonate and Glass Bead Actually Change in a PP Part, and How Do…
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Sink Mark Prediction and Prevention — How Deep Will a Sink Mark Be, What Depth Is Acceptable on a Cosmetic Surface, and How Do You Specify and Measure It Before the Mold Is Cut?

September 2, 2026
Optical Grade Resin Selection for Injection Molding — How Do You Choose Between PC, PMMA, COP and COC for Transparent…
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Warpage in Flat Injection Molded Parts — How Do You Diagnose the Root Cause and What Design, Process or Mold Changes Flatten the Part?

September 2, 2026
Mold Steel Polishing and Texture Repair — How Do You Restore the Cavity Surface When Scratches, Corrosion or Wear Degrade…
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Burn Marks in Injection Molding — How Do You Identify the Root Cause, Where Do They Occur, and What Process Changes Eliminate Them?

September 2, 2026
Boss Design for Injection Molding — How Do You Design Screw Bosses to Avoid Sink Marks, Hold Structural Strength and…
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