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First Mold Insight is your go-to resource for expert knowledge on custom injection molding, CNC machining, and rapid prototyping.
- Indexed episodes, last 90 days
- 35
- Latest publication
- Sep 19, 2026
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- Jul 5, 2026
Latest episodes
Injection Molding Black Spots: Root Causes and Remediation (opens the original)
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Black spots and specks are common, costly defects in injection molded parts, leading to significant losses if not controlled. This episode breaks down how to identify these imperfections, explores their primary causes like carbonization and contamination, and outlines effective prevention strategies to save costs. Key Highlights: Black Spot Standards: Learn the crucial standards from raw material suppliers and customer acceptance criteria for accurately identifying and controlling black spot def
Splay Marks in Injection Molding: Diagnosing & Solving Common Defects (opens the original)
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Splay marks, or silver streaks, are a common yet often elusive defect in injection molding, causing significant waste and production delays. This episode breaks down the root causes—from material moisture to design flaws—and offers practical solutions to effectively resolve them on the shop floor. Key Highlights: Material Moisture Control: Learn how excessive moisture in plastic pellets leads to hydrolytic splay marks and the critical drying conditions needed to prevent them. Thermal Degradation
Burn Marks in Injection Molding: Causes, Effects, and Solutions (opens the original)
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Burn marks are an often-overlooked defect in injection molding, impacting both aesthetics and product performance. This episode delves into the specific causes, from equipment and mold design to process parameters and raw materials, and offers practical strategies for prevention and resolution. Key Highlights: Defect Definition: Understand what burn marks are, how they form from trapped, superheated air, and where they typically appear on molded parts. Product Impact: Explore how burn marks affe
Stop Warpage: Mastering Injection Molding Deformation (opens the original)
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Warpage is a common, frustrating defect in injection molding that impacts part quality and function. This episode breaks down the root causes of warpage—from mold design to material choice—and outlines practical strategies to prevent it. Key Highlights: UNIFORM WALL THICKNESS: Maintaining uniform wall thickness prevents uneven cooling shrinkage and reduces deformation in injection molded parts. REINFORCING RIBS: Properly designed ribs and support structures enhance rigidity, stability, and resis
Mastering Sink Marks: Design, Mold, and Machine Solutions (opens the original)
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Sink marks are a pervasive challenge in injection molding, marring product appearance and affecting functionality. This episode explores the root causes—from material and part design to mold and machine parameters—and outlines a comprehensive prevention strategy. Key Highlights: SINK MARK DEFINITION: Understand sink marks as surface depressions or shrink marks on plastic parts, severely impacting appearance and potentially affecting assembly. PART DESIGN IMPACT: Explore how uneven wall thickness
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