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Last year, an automotive OEM approached us with a recurring issue. The material was validated. The tooling steel was premium. The machine was calibrated. Yet parts kept failing dimensional checks. The root cause was not material. It was the gate location. The mistake most OEMs make When sourcing injection-moulded parts, teams focus on: Material grade. Wall thickness. Cycle time. Tool cost. Very few challenge gate placement. But gate location controls how molten plastic enters

Procurement teams see it all the time. The drawing says ±0.05 mm.The inspection report says “within tolerance.”The assembly line says “doesn’t fit.” So who is wrong? In many cases, no one. And that’s exactly the problem. When “In Spec” Still Fails Injection moulding tolerances are typically verified part by part. But assemblies do not behave part by part. They behave cumulatively. This is where the tolerance stack-up in injection moulding  becomes a real production issue. A h

If an injection-moulded enclosure fails in the field, it almost always fails at the same place. The screw boss. The part looks fine out of the mould. Assembly goes smoothly. Cracks show up weeks or months later, usually during installation, servicing, or thermal cycling. This is not a coincidence. It is how stress accumulates in plastic parts. The screw boss is where stresses converge A screw boss concentrates multiple stress vectors into one small volume of plastic. You have

Why snap-fit electrical enclosures fail after installation Cable entry points are designed to be load concentrators. Cables introduce pull, bend, and torsion forces directly into the housing wall. During installation, these forces are rarely controlled or aligned. In Indian installations, cable routing is often constrained. Cables are bent immediately after entry, tied under tension, or forced to align with nearby conduits. This transfers continuous mechanical load into the e

(Not in Testing) Most snap-fit electrical enclosures pass testing with ease. They  clear dimensional checks.  They survive lab assembly . They meet the drop and vibration criteria. And then they fail in the field. Not because the plastic was weak. Not because the tool was bad. But the design assumptions were incomplete . Testing Environments Are Controlled. Installations Are Not. In testing, snap-fits are assembled once. By trained hands.With correct alignment. At room temper

When the voltage drops, electrical systems compensate by  drawing higher current. That current generates heat where plastic parts are weakest:  around terminals, clips, and internal ribs. Over time, this heat cycling causes slow creep. Snap fits relax. Screw bosses oval out. Contact alignment shifts just enough to create vibration or arcing. None of this is dramatic. It simply shortens product life quietly. Designs validated under stable power conditions do not expose this be

Last month, a home-appliance OEM came to us with a pattern they could not explain.A plastic and metal assembly that passed every lab test was failing after three months in the field. Warped fit. Loosened inserts. Stress cracks around the ribs. Nothing changed in design. Nothing changed in tooling. The environment changed everything. What multi-material assemblies cannot escape When plastic meets metal, or two plastics meet with different shrink rates, the part behaves perfect

Electronic components best suited for injection moulding. Earlier this year, a Bengaluru-based electronics OEM came to us with a simple question: “Which of our parts must  be injection moulded, and which can we keep machining or sourcing from multiple vendors?” Their failures were predictable.  Warped PCB housings after humidity cycles. Connector bodies that didn’t align during assembly.  Enclosures that cracked during torque testing. The common thread? They were using the ri

Automotive parts best suited for injection moulding Automotive teams choose injection moulding because it delivers repeatability, stable material performance, and predictable cost at scale. As India expands localisation , more programs are shifting interior, exterior, electrical and under-hood components into plastics. At Kamath Plastics, we see this shift daily . The parts that perform best are the ones designed for injection moulding from the start, with material, tooling,

The true cost of tool transfers - Kamath Plastics You are unhappy with your current moulder.   Lead times slip, defect rates creep up, and emails go unanswered. So you make a big call. You decide to move your existing moulds to a new supplier. On paper, tool transfer feels simple. Put the mould in a crate, ship it, restart production. In reality, global data shows that transferring injection mould tooling is one of the highest risk moves an OEM can make, with  real exposure

Author: Jonathan Pierre Boucard Last Updated: 3/11/2025 You’ve validated your design, the tooling checks out, and production begins. Then the first batch fails inspection:  it has warped edges, sink marks, and flow lines. Injection moulding defects are more than cosmetic flaws. They are process signals, indicators that something in your design, tooling, or parameters is out of balance. The good news? Most of them are preventable with the right validation and process discipli

India’s injection moulding industry is evolving fast. A decade ago, precision tooling and cleanroom moulding were mostly imported. Today, India’s manufacturers are producing world-class parts for automotive, medical, and electronics OEMs, and doing it at scale. From high-cavitation tools and ISO-certified cleanrooms to zero-rejection quality systems , we have researched strong Indian plastic injection moulding companies that OEMs can add to their vendor portfolio. In an era o

The 8 types of Injection Moulding Gates - Kamath Plastics A Tier-1 automotive supplier was chasing a one-second cycle time improvement on their switch housing program. They had already fine-tuned the resin, cooling, and packing , yet  surface swirl marks and short shots kept creeping in . The real issue wasn’t in the mould temperature or injection speed. It was in the gate design . Selecting the right injection moulding gate type  isn’t just about geometry: it defines how the

Author: Kamath Plastics Content Desk Last Updated: 03-10-2025 EV busbars are simple on paper.  They’re just copper or aluminium...

An article on Injection Moulding vs Blow Moulding: Applications, Advantages, Costs, and more. Choosing the right plastic manufacturing...

Plastic resins - Kamath Plastics Last quarter, a consumer electronics OEM came to us with a baffling issue: Their PA66 resin  “wasn’t...

Injection Moulded Parts - Kamath Plastics In 1969, Kodak India established its presence in Mumbai, entering a value-conscious market...

Last year, a European Tier-1 automotive electronics OEM approached us with a simple request: fix their ballooning costs. They had been...

Last quarter, a procurement head asked us if we could tool a  32-cavity mould for a precision connector program. Their logic? More...

three "problem zones" that give away if your vendor will be able to scale with you Scaling a product from pilot runs to full production...