Resin Comparison Matrix

Injection Molding Materials Comparison

Compare common injection molding resins side by side by shrinkage tendency, dimensional risk, thermal behavior, chemical compatibility, moisture sensitivity and surface requirements before narrowing the final supplier grade.

Use this matrix when you already have a resin shortlist and need to compare materials such as ABS, PC, PA, POM, PP, PBT, PMMA and higher-performance polymers across the criteria that affect molded-part feasibility.

The comparison is intended for engineering screening. Final material approval should still be based on the selected supplier grade, filler or additive package, current technical data, actual part geometry and project-specific molding requirements.

Shrinkage & Dimensional Behavior Compare general shrinkage tendency, warpage sensitivity and geometry-related dimensional risk.
Thermal & Chemical Performance Compare candidate families against the required service environment before reviewing the exact grade.
Moisture & Processing Sensitivity Identify materials that may require closer drying, conditioning or processing control.
Surface & Application Fit Compare cosmetic, transparent, structural, wear and other application-oriented requirements.
Screening-data boundary: material-family values and ratings on this page are comparison references, not universal design limits. Verify the current supplier-grade technical data before final specification or tooling decisions.
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Injection molding materials comparison showing common resin samples and molded-part applications
Compare resin families first; verify the final supplier grade against actual project requirements.

How to Read the Matrix

How to Use This Injection Molding Materials Comparison

Use the matrix to compare material-family tendencies across the criteria that influence molded-part feasibility. It is a screening tool for narrowing an existing shortlist—not a substitute for supplier-grade technical data or project-specific engineering review.

1. Compare Dimensional Behavior First Review shrinkage tendency, warpage sensitivity, moisture response and reinforcement effects before comparing secondary performance criteria.
2. Compare Service-Environment Fit Check thermal, chemical, electrical, wear or environmental requirements against the candidate resin families.
3. Compare Processing and Surface Sensitivity Review drying burden, flow behavior, filler effects, transparency, gloss, texture and other molding-sensitive requirements.
4. Verify the Final Supplier Grade Once the material family has been narrowed, confirm the actual grade, filler level, additives and current technical data before final specification or tooling decisions.
Injection molding resin samples used for side-by-side material comparison by dimensional and processing behavior
Compare resin-family behavior first, then confirm the final supplier grade for the actual part and service conditions.
Comparison-data boundary: values and ratings shown on this page should be treated as engineering screening references. Final resin selection must use the selected supplier-grade data, filler or additive package, actual part geometry and specified service conditions.

Comparison Criteria

Six Criteria for Comparing Injection Molding Materials

Compare resin families across the properties that affect part performance, dimensional behavior, processing sensitivity and surface requirements before reviewing the exact supplier grade.

No single material property should decide the comparison. A resin may rank well for stiffness but poorly for impact, moisture stability, chemical exposure or cosmetic requirements.

Use the six criteria below to compare shortlisted resin families on a consistent basis. Detailed numerical values should be verified from the current supplier-grade technical data.

Injection molding materials comparison criteria covering mechanical, thermal, dimensional, processing, environmental and surface properties
Compare the same engineering criteria across all candidate resin families before narrowing the supplier grade.

Performance

Mechanical Performance

Compare stiffness, strength, toughness, fatigue and creep according to the actual load case rather than relying on one headline property.

Compare tensile / flexural behavior, impact, elongation, creep and fatigue
Watch for filler-related brittleness, notch sensitivity and directional reinforcement effects

Service Environment

Thermal Behavior

Compare how candidate grades respond to the required operating temperature and thermal loading conditions.

Compare supplier-grade thermal data, heat deflection behavior and long-term temperature requirements
Watch for confusing Tg, HDT, melting point and continuous-use temperature as interchangeable limits

Dimensional Risk

Shrinkage & Dimensional Behavior

Compare shrinkage tendency, moisture response, orientation and warpage sensitivity before judging tolerance feasibility.

Compare shrinkage tendency, anisotropy, conditioning response and dimensional stability
Watch for using resin-family shrinkage alone as a tolerance guarantee

Molding Behavior

Processing Sensitivity

Compare material preparation and molding sensitivity that may change the practical production window.

Compare drying, moisture sensitivity, flow behavior, shear sensitivity and processing-temperature requirements
Watch for applying one universal drying or flow limit across different supplier grades

Environmental Fit

Chemical & Environmental Compatibility

Compare the candidate resin against the actual fluids, cleaners, outdoor exposure, electrical or flame-related requirements.

Compare chemical compatibility, stress cracking, UV exposure and grade-specific compliance requirements
Watch for assuming every grade in the same resin family carries the same flame, UV or chemical performance

Appearance

Surface & Cosmetic Performance

Compare the ability of each candidate grade to meet visible, textured, transparent, painted or coated surface requirements.

Compare gloss, texture response, transparency, filler visibility and coating / painting compatibility
Watch for treating amorphous or semi-crystalline behavior as an automatic cosmetic-quality ranking
Comparison boundary: these criteria define what should be compared—not universal numerical limits. Final values for strength, shrinkage, drying, thermal performance, chemical resistance and processing conditions should come from the selected supplier grade and current technical data sheet.

Master Resin Matrix

Injection Molding Resin Comparison Matrix

Compare common resin families by shrinkage tendency, dimensional risk, mechanical profile, thermal performance, chemical compatibility, moisture sensitivity and cosmetic fit.

Typical screening references only: numerical ranges and qualitative ratings can vary by supplier grade, filler level, test method, conditioning and processing history. Confirm final values with the current technical data sheet for the selected grade.
Resin Shrinkage Reference Dimensional / Warpage Risk Mechanical Profile Thermal Performance Chemical Compatibility Moisture / Processing Sensitivity Surface / Cosmetic Fit Typical Applications
ABS ~0.4–0.7% Lower

Generally manageable, but wall imbalance and geometry still influence local shrinkage and distortion. 		Balanced stiffness, impact and general-purpose structural performance. Moderate; verify exact grade against service-temperature requirement. Suitable for many general environments; solvent and stress-cracking exposure should be checked. Processing sensitivity is generally moderate; grade-specific moisture and molding instructions still apply. Common choice for visible housings, textured surfaces and general cosmetic parts. Enclosures, appliance housings, interior trim, consumer products.
PC ~0.5–0.7% Moderate

Dimensional behavior can be good, but residual stress and geometry should be reviewed for clear or highly constrained parts. 		High impact capability with useful structural performance. Higher than many general-purpose resins; verify exact grade and required thermal metric. Chemical compatibility can be selective; stress-cracking exposure requires grade-specific review. Moisture control and processing history can affect appearance and mechanical performance. Strong candidate for transparent, clear or impact-sensitive applications where the chosen grade is suitable. Transparent covers, lenses, protective housings, structural enclosures.
PA6 ~0.7–2.2% Higher

Moisture response, crystallization and geometry can materially affect final dimensions. 		Good strength, toughness and fatigue characteristics depending on grade and conditioning. Useful engineering-temperature capability; verify grade-specific short- and long-term data. Often suitable for oils and industrial fluids; strong acids and other exposures require grade-specific confirmation. Hygroscopic; drying and post-molding conditioning can influence dimensional behavior. Usually suited to functional or structural surfaces rather than premium optical appearance. Brackets, industrial parts, gears, structural molded components.
PA66 GF30 ~0.3–0.8% Directional

Glass-fiber orientation can reduce bulk shrinkage while increasing directional dimensional behavior. 		High stiffness and strength with lower elongation than unfilled grades. Strong engineering-temperature capability; exact HDT and long-term service limits are grade dependent. Often strong against oils and hydrocarbons, but final compatibility should be checked against the actual chemical environment. Drying and fiber-orientation control can be important to stable molding. Fiber visibility and flow-related surface effects may limit premium cosmetic use. Structural connectors, automotive components, reinforced housings and brackets.
POM ~1.8–2.5% Higher

Higher shrinkage tendency requires closer review of wall section, packing, cooling and datum strategy. 		Good stiffness, wear resistance and low-friction performance. Moderate engineering-temperature capability; verify the selected grade against actual service conditions. Good resistance to many fuels, oils and solvents; strong acids and incompatible chemicals should be reviewed separately. Generally less moisture-sensitive than PA, but stable processing conditions still matter. Functional molded surfaces; often selected for sliding, wear and precision mechanical features. Gears, bushings, sliding parts, fuel-system and mechanical components.
PP ~1.5–2.2% Higher

Shrinkage and geometry can strongly influence flatness, assembly fit and local distortion. 		Lower stiffness than many engineering resins but useful ductility and hinge performance in suitable grades. Moderate; verify temperature exposure and load together. Broad chemical resistance in many environments; solvent, temperature and exposure duration remain application-specific. Usually low moisture sensitivity; shrinkage and cooling behavior are often the larger dimensional concerns. Functional surfaces with characteristic tactile appearance; suitability depends on cosmetic requirement and grade. Caps, containers, battery housings, living-hinge parts and general-purpose molded products.
PBT Grade dependent Moderate

Filler content, crystallization, wall geometry and orientation can materially affect dimensions and warpage. 		Good stiffness and engineering performance, especially in reinforced grades. Useful electrical and engineering-temperature performance; verify the exact grade. Often suitable for electrical and industrial environments; chemical exposure remains grade and condition specific. Moisture control before molding can be important to material quality and process stability. Common for functional electrical parts; reinforced grades may show visible fiber or flow effects. Connectors, electrical housings, appliance and automotive components.
PMMA Grade dependent Lower

Often dimensionally manageable, but optical geometry and residual stress remain important. 		Rigid with lower impact toughness than PC unless modified. Moderate; verify actual service temperature and optical-grade data. Chemical compatibility can be limited for some solvents and cleaners. Moisture and processing control can affect optical appearance and defect formation. Strong candidate for clarity, gloss and optical appearance where impact requirements permit. Light guides, transparent covers, lenses and display components.
Shrinkage Is Not a Tolerance Guarantee Actual dimensional capability depends on grade, wall thickness, gate, packing, cooling, orientation and inspection datum strategy.
Thermal Metrics Are Not Interchangeable Tg, HDT, melting point and long-term service temperature describe different behaviors and should be checked separately.
Simulation Is Conditional Flow, packing, cooling or fiber-orientation simulation may be useful where part geometry and project risk justify it; it is not a universal requirement for every resin.

Dimensional Comparison

Shrinkage and Dimensional Risk by Resin Family

Shrinkage percentage alone does not determine dimensional capability. Compare bulk shrinkage, directional behavior, moisture response and geometry sensitivity together when screening materials for flatness, fit and CTQ stability.

Resin Family General Shrinkage Tendency Main Dimensional Concern Key Review Point
ABS Lower Local distortion from wall imbalance, packing or asymmetric cooling. Review wall transitions, ribs, bosses, gate position and visible surface requirements.
PC Lower Residual stress, constrained geometry and optical distortion. Review clear-part geometry, gate location and stress-sensitive service conditions.
PA6 / PA66 Higher / Variable Moisture conditioning and crystallization can change final dimensions. Define dry-state versus conditioned-state dimensional requirements where relevant.
Glass-Filled PA / PBT Directional Fiber orientation can create flow-direction versus cross-flow dimensional differences. Review gate strategy, rib orientation, flatness and CTQ direction relative to expected fiber flow.
POM Higher Larger bulk shrinkage can increase sensitivity to wall section, packing and cooling balance. Review precision fits, gear geometry, wall thickness and datum-related dimensions.
PP Higher Flatness and assembly fit can be sensitive to geometry and cooling imbalance. Review large flat areas, asymmetric walls, living hinges and structural restraint.
Injection molding resin comparison showing shrinkage, warpage and dimensional risk across molded parts
Material shrinkage should be interpreted together with geometry, orientation, moisture and molding conditions.
Wall-Section Balance Thick-to-thin transitions change local packing, cooling and contraction behavior.
Gate & Flow Direction Flow path can affect molecular or fiber orientation and therefore directional dimensions.
Moisture & Conditioning Hygroscopic materials can change dimensions after molding as moisture content approaches the intended service condition.
Cooling & Restraint Uneven cooling and geometry constraints can convert local shrinkage differences into warpage or flatness error.
Dimensional-risk boundary: a resin with higher nominal shrinkage is not automatically unsuitable for a tight-tolerance part, and a lower-shrinkage resin is not automatically dimensionally stable. Final capability depends on the specific grade, geometry, mold design, process condition and measurement strategy.

Processing Comparison

Drying and Processing Sensitivity by Resin Family

Two materials with similar end-use performance can require very different molding controls. Compare moisture sensitivity, drying burden, flow behavior, temperature sensitivity and reinforcement effects before treating two resin families as manufacturing equivalents.

Resin Family Moisture Sensitivity Drying / Material Preparation Processing Sensitivity Main Production Concern
ABS Moderate Follow the selected grade’s supplier instructions, especially where surface appearance is important. Generally manageable across a broad range of applications. Moisture, overheating or poor venting can contribute to cosmetic defects and unstable appearance.
PC Higher Controlled material preparation is commonly important before molding. Sensitive to moisture, thermal history and excessive residence or shear conditions. Appearance, residual stress and mechanical performance may be affected if material preparation or processing is unstable.
PA6 / PA66 Higher Drying and controlled material handling are often important before molding. Moisture state can affect both molding behavior and final conditioned dimensions. Separate molding moisture control from post-molding conditioning requirements when dimensional stability is critical.
PA / PBT Glass-Filled Higher Follow supplier-grade drying requirements and control material handling before processing. Fiber orientation and shear history can influence flow, appearance and directional properties. Stable drying alone does not control warpage; gate and flow direction remain important.
POM Lower Often less moisture-sensitive than hygroscopic engineering polymers, but grade instructions still apply. Temperature and residence-time control are important because inappropriate processing can degrade the polymer. Avoid treating lower moisture sensitivity as permission for an uncontrolled processing window.
PP Lower Usually lower drying burden than hygroscopic engineering resins. Flow, packing, cooling and shrinkage behavior can be more important than moisture control. Large flat geometry and uneven cooling can amplify dimensional variation even when material preparation is straightforward.
PBT Higher Controlled drying and material handling can be important before molding. Moisture, melt history, reinforcement and crystallization affect processing stability. Electrical or reinforced grades should be reviewed using the actual supplier processing guidance.
PMMA Moderate Material preparation is especially relevant where optical or high-gloss appearance is required. Sensitive cosmetic parts require stable melt and mold conditions. Moisture or processing instability can create visible defects in transparent or glossy parts.
Drying Requirement Use the current supplier-grade recommendation rather than a universal moisture target for an entire resin family.
Material Handling Storage, exposure time and transfer conditions can affect the moisture state of hygroscopic materials before molding.
Thermal History Melt temperature, residence time and shear can influence degradation, appearance and mechanical performance.
Reinforcement Effects Glass fiber or other fillers can change viscosity, flow orientation, surface appearance and directional material behavior.
Processing-data boundary: drying temperature, drying time, allowable moisture content, melt temperature and mold-temperature settings should not be generalized across a complete resin family. Use the current processing guide for the selected supplier grade and adjust the molding plan to the actual part and tool.

Matrix Examples

How to Read the Matrix: Three Material Comparison Examples

These simplified examples show how a part requirement can be translated into a side-by-side resin comparison. They illustrate comparison logic only; they are not universal material-selection or validation rules.

Example 1 — Visible Housing

ABS vs Higher-Shrinkage Semi-Crystalline Candidates

Consider a visible housing with mating features, snap fits and a long sealing perimeter.

Requirement Dimensional consistency, surface appearance and repeatable assembly fit.
ABS Advantage Lower general shrinkage tendency and strong cosmetic suitability can make ABS a useful comparison candidate for this type of part.
Trade-Off Service temperature, impact, chemical exposure and long-term environment still need to be checked against the actual grade.
Project-Specific Wall transitions, sealing geometry, gate location and CTQ tolerances remain part-specific.
ABS housing used as an injection molding material comparison example for dimensional fit and surface requirements
Example comparison: dimensional and cosmetic requirements can favor one resin family without making it universally superior.

Example 2 — Reinforced Connector

PA66-GF30 vs Unfilled Engineering Resins

Consider a structural connector requiring stiffness, heat capability, chemical compatibility and pin-position stability.

Requirement Structural rigidity, thermal performance, chemical resistance and controlled connector geometry.
GF Advantage Glass reinforcement can increase stiffness and strength while reducing bulk shrinkage relative to some unfilled grades.
Trade-Off Fiber orientation can introduce directional behavior, visible fiber effects and geometry-dependent warpage.
Project-Specific Gate direction, pin alignment, wall transitions and actual supplier-grade thermal and chemical data require separate review.
PA66 GF30 connector used as an injection molding material comparison example for stiffness and directional warpage
Reinforcement can improve stiffness while introducing directional processing and dimensional behavior.

Example 3 — Clear Component

PC vs PMMA for Clear Molded Parts

Consider a transparent molded component where clarity, impact resistance, residual stress and surface quality all matter.

PC Tendency Often favored where higher impact resistance is important, but drying, residual stress and chemical compatibility require close attention.
PMMA Tendency Often attractive for optical clarity and gloss where the application can accept lower impact toughness.
Main Trade-Off The comparison is not “clarity versus no clarity,” but impact, stress sensitivity, chemical exposure, processing and optical requirements together.
Project-Specific Optical grade, wall geometry, gate position, mounting stress and service environment determine the final material decision.
PC clear lens used as an injection molding materials comparison example for clarity impact and residual stress
Clear-part comparison should consider impact, optical quality, residual stress and chemical environment together.
Example boundary: these scenarios demonstrate how to interpret the comparison matrix. Final resin approval should still use the actual supplier grade, part geometry, service environment and project-specific manufacturing requirements.

Related Engineering Resources

Continue the Comparison with More Specific Material Data

Use the next resource according to the question you still need to resolve: shrinkage, warpage, drying, surface compatibility, tolerance feasibility, selection methodology or resin-family reference data.

Detailed Comparison Data

Use these pages when one comparison variable needs more detail than the master resin matrix provides.

Dimensional Data

Plastic Shrinkage Rate by Resin

Compare typical molding shrinkage references across common resin families before reviewing the selected supplier grade.

Compare plastic shrinkage rates →

Dimensional Risk

Warpage Risk by Material

Compare how resin behavior, reinforcement, geometry, flow direction and cooling interact to influence molded-part distortion.

Compare warpage risk by material →

Processing Data

Resin Drying Requirements

Review typical drying and moisture-control references for hygroscopic resins, then confirm the final supplier-grade processing guide.

Compare resin drying requirements →

Decision and Reference Resources

Use these pages when the remaining question is about selection logic, tolerance feasibility or resin-family reference information.

Resin Reference

Injection Molding Materials Library

Use the materials library when you need resin-family characteristics, common applications and broader reference information rather than another comparison matrix.

Open the injection molding materials library →
Page-role boundary: this page is the side-by-side injection molding materials comparison matrix. Use the Material Selection Guide for how to choose a resin and the Materials Library for what each resin family is and where it is commonly used.

Engineering Data Note

Typical resin ranges and qualitative ratings on this page are intended for preliminary engineering comparison. Final material properties, shrinkage values, drying requirements and processing parameters should be confirmed using the current supplier-grade technical data, applicable test conditions and project-specific molding requirements.

Engineering Review Kevin Liu
Last Reviewed September 2026
Data Basis Supplier-grade TDS + project-specific requirements

Project Material Review

Send Your CAD for Resin Comparison & Injection Molding Review

If two or more resin families appear suitable, send the available project data so the shortlist can be reviewed against the actual geometry, CTQs, service conditions and molding requirements.

What to Send

  • 3D CAD + 2D Drawing Include CTQs, datums, tolerances and assembly interfaces where available.
  • Candidate Materials Share the current resin shortlist, supplier grades or material requirements if the grade is still open.
  • Service Conditions Include temperature, chemicals, UV, wear, electrical, optical or other relevant requirements.
  • Production Context Expected volume, cosmetic requirements, quality documentation and known process constraints.
Engineering Review May Include
  • Side-by-side material trade-off comments
  • Shrinkage, dimensional and processing-risk observations
  • DFM or tolerance-feasibility feedback where applicable
  • Recommended next checks before the resin or tooling assumptions are finalized

Compare the Resin Shortlist Against the Actual Part

Submit the available CAD, drawing and material requirements for an engineering review before final resin and tooling assumptions are frozen.

Send CAD for Material Review Injection Molding Services

Confidential CAD files and project information can be handled under NDA where required before engineering review begins.