---
title: "Why PC Drill Housings Fail in Security Hardware and How to Fix It - JATERSON"
description: "Security hardware demands housings that withstand abuse and harsh environments. Polycarbonate offers high impact strength but introduces critical notch sensitivity risks. We break down material selection, processing, and validation for reliable OEM production."
url: "https://www.jaterson.com/manufacturing/pc-drill-housings-security-hardware-fail-fix.html"
language: "en"
type: "Article"
category: "Plastic Component Manufacturing Guide"
datePublished: "2026-10-07"
dateModified: "2026-10-07"
brand: "JATERSON"
manufacturer: "JATERSON"
image: "https://static.jaterson.com/uploads/industry/housing/08Pg8mBKV5IH3.webp"
---

# Why PC Drill Housings Fail in Security Hardware and How to Fix It

## The Counterintuitive Weakness of a "Strong" Material

When procurement managers and engineers specify polycarbonate (PC) for security drill housings,the decision is almost always driven by one celebrated property: high impact resistance.The logic seems flawless—security and construction tools face drops,kicks,and rough handling,so you need the toughest plastic.This is the most common and costly misconception.The reality,honed over two decades of molding components for hardware,is that raw impact strength is a secondary concern.The primary failure point for PC in these applications is not blunt force,but **environmental stress cracking (ESC) and notch sensitivity** induced by the very design and assembly features your product requires.

![Avoiding Stress Cracks in Your Security Drill Housings: A Material & Process Deep Dive](https://static.jaterson.com/uploads/industry/housing/08Pg8mBKV5IH3.webp)

Think about a drill housing for a security door installation tool or a core drilling rig.It’s not a smooth,featureless shell.It has mounting bosses,snap-fit clips for battery packs,screw holes for motor retention,and openings for chucks and vents.Each sharp internal corner,each thread,each press-fit metal insert acts as a stress concentrator—a notch.PC,despite its bulk toughness,is notoriously poor at resisting crack propagation from these points,especially when exposed to oils,greases,or certain cleaning chemicals common on job sites.A housing can pass every drop test in the lab only to develop hairline cracks and fail in the field after exposure to a lubricant during maintenance.This is the core manufacturing challenge: engineering not just for strength,but for stress management.

## Material Selection: Beyond the PC Data Sheet

Selecting the right PC grade is the first critical gate.Not all polycarbonates are equal for a functional,load-bearing housing.The choice directly dictates [mold design](https://www.jaterson.com/capabilities/mold-design-tooling/),processing windows,and long-term performance.

- **Impact-Modified vs.Standard PC:** While standard PC offers good clarity and stiffness,impact-modified grades (often blended with ABS or other polymers) significantly improve notch sensitivity and ductility at the expense of some heat resistance and surface hardness.For a housing that will see assembly stresses,this is often a necessary trade-off.
- **Glass-Filled PC:** Adding glass fibers boosts stiffness,dimensional stability,and heat deflection temperature—crucial for housings near motors that generate heat.However,it increases part weight,reduces impact strength,and creates a fibrous,abrasive surface that can wear on mating parts.It also demands more robust tooling.
- **UV-Stabilized and Lubricated Grades:** For tools used outdoors,UV stabilization is non-negotiable to prevent yellowing and embrittlement.Internally lubricated grades can aid in the assembly of gears or moving parts within the housing,but compatibility with your grease must be verified.

### Comparative Material Landscape for Security Housings

While PC is common,it’s not always the sole answer.A responsible manufacturer should provide a comparative perspective based on the application’s priority triangle: strength,cost,and environmental resistance.

| Material | Key Advantages for Security Housings | Key Limitations & Risks | Typical Application Fit |
| --- | --- | --- | --- |
| **Polycarbonate (PC)** | High impact strength,good stiffness,transparency options,UL94 V-0/V-2 flame ratings. | Poor chemical/solvent resistance (ESC),notch sensitivity,can be prone to cracking from internal stress. | Primary housing where impact is primary concern and chemical exposure is controlled. |
| **PC/ABS Blend** | Better processability,improved chemical/ESC resistance,good low-temperature impact. | Lower heat resistance than pure PC,surface appearance can be less premium. | Excellent all-rounder for complex housings with snap-fits and assemblies. |
| **Nylon (PA6,PA66)** | Excellent wear/[abrasion resistance](https://www.jaterson.com/knowledge/wear-resistance/),good chemical resistance,high heat deflection. | High moisture absorption affecting dimensions & strength,higher cost,requires drying. | Housings with internal moving parts or exposure to fuels/oils. |
| **Acetal (POM)** | Superior fatigue endurance,excellent lubricity,low moisture absorption. | Poor UV resistance,can be brittle in very thick sections,difficult to bond. | Smaller,precision gear housings or internal components within the main shell. |

## The Manufacturing Crucible: From Pellet to Reliable Housing

![Why PC Drill Housings Fail in Security Hardware and How to Fix It](https://static.jaterson.com/uploads/industry/default/GAOVCLsuKHZMb.webp)

Material selection is just the contract.Manufacturing execution is where the promise is kept or broken.For PC housings,the injection molding process must be meticulously controlled to minimize the internal stresses that later become failure points.

### Mold Design: The Foundation of Stress Management

The mold is not just a cavity; it’s a stress-management system.For PC,key design decisions include:

- **Gate Type and Location:** Large,fan or tab gates are preferred over small pinpoint gates to allow less restrictive flow and reduce shear-induced stress.Gates must be positioned to ensure uniform filling and to avoid directing flow against cores or pins,which creates weld lines in high-stress areas.
- **Radii,Radii,Radii:** This is the single most important design rule.Every internal corner,every step,every base of a rib must have a generous radius.A sharp corner can reduce the effective impact strength of PC by over 70%.We specify minimum radii based on wall thickness as a non-negotiable drawing requirement.
- **Cooling Circuit Design:** Uneven cooling is a primary cause of residual stress.Complex housings require conformal cooling channels or baffles to ensure the thick mounting boss sections cool at the same rate as the thin walls,preventing [sink marks](https://www.jaterson.com/knowledge/injection-molding-sink-marks/) and locking in stress.

### Processing Parameters: The Art of Control

Running PC is about balance.The machine operator is managing a set of interlinked variables to achieve a stress-minimized part.

First,**material drying is absolute**.PC is hygroscopic.Even slight moisture causes hydrolysis during molding,degrading molecular weight and embrittling the part.We dry at 120°C for 4+ hours to a moisture content below 0.02%.Second,melt temperature must be high enough for good flow (280-320°C typical) but not excessive to prevent degradation.Third,injection speed and pressure need to be optimized.Too fast creates high shear; too slow allows the melt front to cool prematurely,both increasing stress.A multi-stage profile is often used: fast fill to a transition point,then slower pack and hold.Finally,mold temperature is critical.A hot mold (80-110°C) allows the material to relax and pack out more evenly,significantly reducing molded-in stress compared to a cold mold.

## Validation and Quality: Looking for the Hidden Flaws

Standard dimensional checks and visual inspection are not enough for a security-critical housing.The hidden enemy is residual stress.We implement a tiered validation approach for new PC housing projects.

**First Article Inspection (FAI)** goes beyond measurements.It includes a **solvent stress test**.Approved samples are immersed in a controlled mixture (often a mild solvent like isopropyl alcohol or a calibrated mix) for a fixed time.The surface is then examined under magnification for the appearance of fine crazing or cracks,which map the areas of high internal stress.This test directly correlates to the risk of field failure from chemical exposure.Finding these cracks at the sample stage allows for corrective action—adjusting gate size,increasing radii,or modifying process parameters—before tooling is finalized or mass production begins.

During production,[statistical process control (SPC)](https://www.jaterson.com/knowledge/statistical-process-control-spc/) on key parameters—melt temp,injection pressure,cycle time—is maintained.Periodic part audits repeat the dimensional checks and may include a destructive physical test,such as a **torque test on molded-in inserts** or a **functional test of snap-fit assemblies**,to ensure consistent mechanical performance.

## Project Coordination: Aligning Design,Material,and Process

Successfully manufacturing a reliable PC drill housing is a cross-functional endeavor from the first sketch.The most efficient projects follow a parallel development path where manufacturing feasibility is integrated early.

As the manufacturing partner,our role is to bridge the gap between design intent and production reality.This means providing **Design for Manufacturability (DFM) feedback** at the concept stage,focusing on wall thickness uniformity,rib design,and corner radii.It means being transparent about **material trade-offs and their cost implications**—for example,explaining why a glass-filled PC might add 15% to the material cost but save 30% in cycle time due to faster cooling,or why a minor design change can allow the use of a more robust but less expensive PC/ABS blend.It means coordinating **sample development with realistic timelines** for mold trials,stress testing,and design iterations.

The final deliverable is not just a batch of housings that meet a print.It is a stable,capable manufacturing process that produces components with predictable,long-term performance in the harsh world of security hardware—where failure is not an option.This requires moving beyond the simplistic "PC is tough" narrative and engaging with the full,complex reality of engineering polymers for demanding applications.

## Related Resources

- [Plastic Component Manufacturing Guide](https://www.jaterson.com/manufacturing/plastic-components/)
- [Injection Molding Guide](https://www.jaterson.com/manufacturing/injection-molding/)
- [Hardware Manufacturing Guide](https://www.jaterson.com/manufacturing/hardware/)
- [Capabilities](https://www.jaterson.com/capabilities/)
- [Custom Manufacturing](https://www.jaterson.com/custom-manufacturing/)
- [Products](https://www.jaterson.com/products/)
- [Manufacturing Guides](https://www.jaterson.com/manufacturing/)
- [Buying Guides](https://www.jaterson.com/buying/)
- [Manufacturing Knowledge Base](https://www.jaterson.com/knowledge/)
- [Plastic Components](https://www.jaterson.com/knowledge/plastic-components/)
- [Plastic Components Q&A](https://www.jaterson.com/qa/plastic-components/)

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