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Engineered Performance at the Core

DoorCoresforEveryApplication

From cost-effective particleboard to fire-rated mineral core, engineered structural composite lumber, and specialty cores, our doors are built to meet the unique demands of healthcare, education, hospitality, commercial, and institutional spaces. Durable, reliable, and purpose-built, each core delivers the right balance of strength, performance, and functionality. Explore our core options and choose the solution that fits your project perfectly.

Particleboard–Non-Rated

Particleboard – Non-Rated

  • Cost-effective option

  • Good dimensional stability

  • Suitable for standard-duty healthcare spaces

Forte™ particleboard products are designed to support a wide range of interior door constructions, including flush cores, profiled cores, and hardware reinforcement components. Used in solid and hollow core door assemblies, our particleboard contributes to structural performance while supporting acoustic and radiation-shielded door requirements. Controlled manufacturing processes and material consistency provide dependable performance across commercial and institutional environments, with flexibility to meet varying design, duty, and regulatory needs.

The table below outlines the key characteristics of non-rated particleboard to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-PC-B-NR

C-PC-B-NR

C-PC-NB-NR

Product Specification

Wood-based particleboard core

Typical Core Density

~32-36 lbs./ft³ (513-577 kg/m3)

Door Thickness

1-3/8”, 1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”

Pairs up to 8’0” x 10’0”

Singles up to 4’0” x 9’0”

Pairs up to 8’0” x 9’0”

Fire Rating

Non-Rated

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Heavy-Duty

Door Weight

1-3/8” – 4.3 lbs./sf

1-3/4” – 5.5 lbs./sf

Particleboard–20-Minuteand45-Minute

Particleboard – 20-Minute and 45-Minute

  • Designed for fire-rated door assemblies

  • Consistent, reliable core performance

  • Suitable for commercial and institutional applications

Forte™ fire-rated particleboard is engineered for interior door constructions that require fire protection and dependable structural performance. Suitable for use in flush cores, profiled cores, and hardware reinforcement components, it supports fire-rated door assemblies in commercial and institutional environments while maintaining consistent material stability, reliable performance, and flexibility to meet varying design, duty, and regulatory requirements.

The table below outlines the key characteristics of 20-Minute Fire-Rated particleboard to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-PC-B-FR20

C-PC-B-FR20

C-PC-NB-FR20

Product Specification

Wood-based particleboard core

Typical Core Density

~32-36 lbs./ft³ (513-577 kg/m3)

Door Thickness

1-3/8”, 1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”

Pairs up to 8’0” x 9’0”

Singles up to 4’0” x 9’0”

Pairs up to 8’0” x 9’0”

Fire Rating

20-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Heavy-Duty

Door Weight

1-3/8” – 4.3 lbs./sf

1-3/4” – 5.5 lbs./sf

The table below outlines the key characteristics of 45-Minute fire-rated particleboard to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-PC-B-FR45

C-PC-B-FR45

Product Specification

Fire-resistant wood-based particleboard core

Typical Core Density

~36-38 lbs./ft³ (577-609 kg/m3)

Door Thickness

1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 8’0”

Pairs up to 8’0” x 7’0”

Singles up to 4’0” x 8’0”

Pairs up to 8’0” x 7’0”

Fire Rating

45-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Extra Heavy-Duty

Door Weight

1-3/4” – 6.4 lbs./sf

ExtraHeavy-DutyParticleboard–Non-Rated

Extra Heavy-Duty Particleboard – Non-Rated

  • Higher density construction for increased strength

  • Enhanced screw-holding capability

  • Designed for high-traffic or abuse-prone environments

Extra heavy-duty particleboard cores are engineered for high-impact, high-traffic commercial and institutional environments where long-term durability is critical. The dense, reinforced particleboard construction enhances strength and screw-holding capability, while the core type directly influences structural performance, abuse resistance, and overall service life of the door assembly.

The table below outlines the key characteristics of extra heavy-duty particleboard to help guide specification decisions.

Attribute

Aspiro®

Model

A-PC-B-EHD-NR

Product Specification

Wood-based particleboard core

Typical Core Density

36-38 lbs./ft³ (577-609 kg/m³)

Door Thickness

1-3/4"

Maximum Size

Singles up to 4'0" x 10'0"
Pairs up to 8'0" x 9'0"

Fire Rating

Non-Rated and 20-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Heavy-Duty

Door Weight

1-3/4" – 6.4 lbs./sf

ExtraHeavy-DutyParticleboard–20-MinuteFire-Rated

Extra Heavy-Duty Particleboard – 20-Minute Fire-Rated

  • Supports certified fire-rated door assemblies (when part of a tested assembly)

  • Higher density construction for increased strength and screw-holding capability

  • Suitable for commercial and institutional applications requiring fire protection

Fire-rated extra heavy-duty particleboard cores are engineered to support door assemblies that must meet stringent fire-resistance requirements while maintaining structural stability. The specially formulated particleboard core helps doors achieve certified fire ratings when used within a tested assembly, while also providing consistent density, reliable screw-holding capability, and dependable performance in commercial and institutional environments.

The table below outlines the key characteristics of extra heavy-duty particleboard to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-PC-B-EHD-FR20

C-PC-B-EHD-FR20

Product Specification

Wood-based particleboard core

Typical Core Density

36-38 lbs./ft³ (577-609 kg/m3)

Door Thickness

1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”

Pairs up to 8’0” x 9’0”

Singles up to 4’0” x 9’0”

Pairs up to 8’0” x 9’0”

Fire Rating

20-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Extra Heavy-Duty

Door Weight

1-3/4” – 8.0 lbs./sf

StructuredCompositeLumber–Non-Rated

Structured Composite Lumber – Non-Rated

  • Stronger and more impact-resistant

  • Excellent screw-holding performance

  • Ideal for high-traffic or heavy-use areas

Structured Composite Lumber (SCL) cores are designed for demanding commercial and institutional environments where enhanced strength and durability are required. Engineered wood strands are bonded together to create a dense, uniform core.

The table below outlines the key characteristics of structured composite lumber to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-SCLC-B-NR

C-SCLC-B-NR

Product Specification

Structural Composite Lumber Core

Typical Core Density

~38 lbs./ft³ (609 kg/m³)

Door Thickness

1-3/8”, 1-3/4”, 2”, 2-1/4

1-3/8”, 1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”
Pairs up to 8’0” x 9’0”

Singles up to 4’0” x 9’0”
Pairs up to 8’0” x 9’0”

Fire Rating

Non-Rated

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Extra Heavy-Duty

Door Weight

1-3/8” – 5.2 lbs./sf
1-3/4” – 6.5 lbs./sf

2” – 7.8 lbs./sf
2-1/4” – 8.8 lbs./sf

StructuredCompositeLumber–20-Minute

Structured Composite Lumber – 20-Minute

  • Dense, engineered structure for added strength and stability

  • Excellent screw-holding capability for hardware installation

  • Suitable for high-traffic commercial and institutional environments requiring fire protection

20-minute fire-rated Structured Composite Lumber (SCL) cores combine the strength of structured composite lumber with the ability to support fire-resistance requirements in door assemblies. Engineered wood strands are bonded together to create a dense, uniform core that provides enhanced structural integrity while enabling doors to achieve a 20-minute fire rating when used as part of a tested assembly.

The table below outlines the key characteristics of structured composite lumber to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-SCLC-B-FR20

C-SCLC-B-FR20

Product Specification

Structural Composite Lumber Core

Typical Core Density

~38 lbs./ft³ (609 kg/m³)[MA1]

Door Thickness

1-3/8”, 1-3/4”, 2”, 2-1/4

1-3/8”, 1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”
Pairs up to 8’0” x 9’0”

Singles up to 4’0” x 9’0”
Pairs up to 8’0” x 9’0”

Fire Rating

20-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Extra Heavy-Duty

Door Weight

1-3/8” – 5.2 lbs./sf
1-3/4” – 6.5 lbs./sf

2” – 7.8 lbs./sf
2-1/4” – 8.8 lbs./sf

MineralCore–45-,60-,and90-MinuteFire-Rated

Mineral Core – 45-, 60-, and 90-Minute Fire-Rated

  • Non-combustible construction for fire-rated assemblies

  • Provides reliable thermal resistance and structural stability

  • Ideal for healthcare, laboratory, and institutional environments requiring certified fire protection

Forte™ Mineral Core is designed for applications where fire resistance is a primary requirement in commercial and institutional environments. Engineered for use in 45-, 60-, and 90-minute fire-rated door assemblies, its mineral composition provides dependable thermal resistance, smooth machining, and reliable bonding with listed door manufacturing adhesives. Produced under controlled density and thickness tolerances, Forte™ Mineral Core delivers stable structural performance, durability, and confidence in certified fire-rated assemblies.

The table below outlines the key characteristics of mineral core to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-MC-B-FR45
A-MC-B-FR60
A-MC-B-FR90

C-MC-B-FR45
C-MC-B-FR60
C-MC-B-FR90

Product Specification

Mineral core

Typical Core Density

~18 lbs./ft³ (288 kg/m³)

Door Thickness

1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 4’0” x 10’0”
Pairs up to 8’0” x 9’0”

Singles up to 4’0” x 9’0”
Pairs up to 8’0” x 9’0”

Fire Rating

45-, 60-, 90-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

- Mineral Core without Blocking - Below Standard
- Mineral Core with Blocking - Extra Heavy Duty
- Blocking for mineral core doors provided upon request

Door Weight

1-3/4” – 3.7 lbs./sf

HollowCore–Non-Rated

Hollow Core – Non-Rated

  • Lightweight, economical option

  • Provides basic sound and thermal separation

  • Suitable for interior doors in low-traffic or non-rated spaces

Hollow cores are designed for interior environments where weight savings and cost efficiency are priorities. The core consists of a lightweight, cellular structure with limited structural support and dimensional stability, and basic acoustic or thermal performance for non-rated applications.

The table below outlines the key characteristics of hollow core to help guide specification decisions.

Series

Aspiro®

Cendura®

Model

A-HC-NB-NR

C-HC-NB-NR
C-HC-NB-MP-NR

Product Specification

5-1/2" Kraft Paper Honeycomb. Lock Blocks (2) per door.
3" x 20" for 1-3/4", 3" x 16" for 1-3/8”

Typical Core Density

N/A

Door Thickness

1-3/8”, 1-3/4”

Maximum Size

4’0” x 8’0”

Fire Rating

Non-Rated and 20-Minute

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request

EPD

Yes

Quality Standards

WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)

WDMA Performance Duty Level

N/A

Door Weight

1-3/8” – 1.3 lbs./sf

1-3/4” – 1.7 lbs./sf

SoundAttenuation/AcousticCore–Non-Rated

Sound Attenuation / Acoustic Core – Non-Rated

  • Engineered to reduce sound transmission between spaces in healthcare, educational and office environments

  • Dense, uniform core provides consistent acoustic performance

  • Offers durability for moderate- to high-traffic interior applications

Sound attenuation / acoustic cores are designed for environments where sound control and privacy are important. The specialized core material absorbs and dampens sound, while the construction type determines the door’s durability and suitability for high-traffic or sensitive interior spaces.

The table below outlines the key characteristics of acoustic core to help guide specification decisions.

Series

Aspiro®

Cendura®

Product Specification

Proprietary acoustically rated core

STC Ratings

30 to 47

Door Thickness

1-3/4”

Maximum Size

Single and Pair sizes vary by STC Rating. Refer to Appendix M

Fire Rating

Non-Rated

Environmental Options

TSCA Title VI / CARB Phase 2 compliant

EPD

Yes

Quality Standards

WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)

WDMA Performance Duty Level

N/A

Door Weight

Ranges from 3.97 to 11.6 lbs./ft

SoundAttenuation/AcousticCore–20-and45-MinuteFire-Rated

Sound Attenuation / Acoustic Core – 20- and 45-Minute Fire-Rated

  • Dense, engineered core delivers reliable acoustic and fire-rated performance

  • Compatible with 20- and 45-minute tested fire-rated assemblies

  • Durable construction suited for moderate- to high-traffic interior spaces

Sound attenuation / acoustic fire-rated doors combine two critical performance requirements in a single opening—life safety and sound control. Engineered to meet certified fire-resistance ratings while also reducing sound transmission between spaces, these doors are ideal for environments where both safety and acoustic privacy are essential.

The table below outlines the key characteristics of acoustic core to help guide specification decisions.

Series

Aspiro®

Cendura®

Product Specification

Proprietary acoustically rated core

STC Ratings

30 to 47

Door Thickness

1-3/4”

Maximum Size

Single and Pair sizes vary by STC Rating. Refer to Appendix M

Fire Rating

20- and 45-Minute

Environmental Options

TSCA Title VI / CARB Phase 2 compliant

EPD

Yes

Quality Standards

WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)

WDMA Performance Duty Level

N/A

Door Weight

Ranges from 3.97 to 11.6 lbs./ft

RadiationShielded–Non-Rated

Radiation Shielded – Non-Rated

  • Integrated lead shielding helps protect against X-ray and similar radiation

  • Compatible with tested radiation-shielded door constructions

  • Core options available to support varying durability, traffic, and fire-rating requirements

Radiation-shielded door cores are designed for healthcare and laboratory environments where protection from X-ray or similar radiation is required. The lead shielding material is integrated into the door, while the core type determines strength and durability. Core selection depends on traffic, durability needs, fire-rating requirements, and budget.

The table below outlines the key characteristics of radiation shielded cores to help guide specification decisions.

Series

Aspiro®

Aspiro®

Model

A-PC-B-XR-NR

A-SCLC-B-XR-NR

Product Specification

Wood-based particleboard core with lead

SCL core with lead

Typical Core Density

32-36 lbs./ft³ (513-577 kg/m3)

~38 lbs./ft³ (609 kg/m³)

Door Thickness

1-3/4”

Lead Thickness

1/32”, 1/16”, 1/8”

Maximum Size

ITS-WH Single 4’0 x 8’0 Standard Pairs 8’0 x 8’0

Fire Rating

Non-Rated

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

EPD

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Heavy-Duty

Door Weight

Thickness lbs./sf 1/32" lead 5.8
Thickness lbs./sf 1/16" lead 7.8

Thickness lbs./sf 1/8" lead 13.8

RadiationShielded–20-,45-,and60-MinuteFire-Rated

Radiation Shielded – 20-, 45-, and 60-Minute Fire-Rated

  • Integrated lead shielding provides protection from X-ray and similar radiation while supporting fire-rated door assemblies

  • Compatible with tested fire-rated, radiation-shielded constructions

  • Durable core options designed to meet fire protection, traffic, and performance requirements

Radiation-shielded door cores are designed for healthcare and laboratory environments where protection from X-ray or similar radiation is required. The lead shielding material is integrated into the door, while the core type determines strength, durability, and fire performance. Core selection depends on traffic, durability needs, fire-rating requirements, and budget.

The table below outlines the key characteristics of radiation shielded cores to help guide specification decisions.

Series

Aspiro®

Aspiro®

Aspiro®

Model

A-PC-B-XR-FR20

A-SCLC-B-XR-FR20

A-MC-B-XR-FR45 A-MC-B-XR-FR60

Product Specification

Wood-based particleboard core with lead

SCL core with lead

MC with lead

Typical Core Density

32-36 lbs./ft³ (513-577 kg/m3)

~38 lbs./ft³ (609 kg/m³)[MA1]

~18 lbs./ft³ (288 kg/m³)

Door Thickness

1-3/4”

Lead Thickness

1/32”, 1/16”, 1/8”

Maximum Size

ITS-WH Single 4’0 x 8’0 Standard Pairs 8’0 x 8’0

Fire Rating

20-Minute

45-60 Min

Environmental Options

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request
• FSC® upon request

• TSCA Title VI / CARB Phase 2 compliant
• ULEF/NAUF upon request

EPD

Yes

Yes

Quality Standards

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

• WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)
• AWS available upon request

WDMA Performance Duty Level

Heavy-Duty

- MC without Blocking - Below Standard - MC with Blocking - Extra Heavy Duty

Door Weight

Thickness lbs./sf

1/32" lead 5.8

Thickness lbs./sf

1/16” lead 7.8

Thickness lbs./sf

1/8" lead 13.8

MoldedPanel–Non-Rated

Molded Panel – Non-Rated

  • Interior commercial and institutional spaces where decorative panel design is desired

  • Offices, corridors, and common areas with moderate traffic

  • Applications requiring consistent panel detail and smooth surface finishes

Molded panel cores are designed for commercial and institutional environments where decorative style and consistent panel detail are important. The molded core construction provides dimensional stability and smooth surfaces, while the core type influences durability, impact resistance, and suitability for interior applications.

The table below outlines the key characteristics of molded panel cores to help guide specification decisions.

Series

Cendura®

Model

C-PC-B-MP-NR C-PC-NB-MP-NR

C-HC-NB-MP-NR

Product Specification

Wood-based particleboard core

5-1/2" Kraft Paper Honeycomb. Lock Blocks (2) per door. 3" x 20" for 1-3/4", 3" x 16" for 1-3/8”

Typical Core Density

32-36 lbs./ft³ (513-577 kg/m3)

N/A

Door Thickness

1-3/8”, 1-3/4”

Maximum Size

Singles up to 3’0” x 8’0”

Pairs up to 6’0” x 8’0”

3’0 x 7’0” Standard-all Designs

3’0 x 8’0” 2-Panel

Bifolds Available

Fire Rating

Non-Rated and 20-Minute

Non-Rated

Environmental Options

TSCA Title VI / CARB Phase 2 compliant

EPD

Yes

Quality Standards

WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)

WDMA Performance Duty Level

Heavy-Duty
Note: This construction meets the Extra Heavy Duty performance when surface mounted hardware is attached with through bolts.

N/A

Door Weight

1-3/8” – 4.3 lbs./sf

1-3/4” – 5.5 lbs./sf

1-3/8” – 1.3 lbs./sf

1-3/4” – 1.7 lbs./sf

MoldedPanel–20-,45-,and60-MinuteFire-Rated

Molded Panel – 20-, 45-, and 60-Minute Fire-Rated

  • Interior commercial and institutional spaces requiring decorative panel design and fire protection

  • Offices, corridors, and common areas where fire-rated doors are required

  • Applications needing consistent panel detail with smooth, paint-ready surfaces

Fire-rated molded panel cores are designed for commercial and institutional environments where decorative panel styling must also meet fire-resistance requirements. The molded construction provides consistent panel definition and smooth surfaces, while supporting certified fire ratings when used as part of a tested door assembly. This allows designers to maintain traditional panel aesthetics while meeting life-safety code requirements.

The table below outlines the key characteristics of fire-rated molded panel cores to help guide specification decisions.

Series

Cendura®

Cendura®

Model

C-PC-B-MP-FR20

C-PC-NB-MP-FR20

C-MC-B-MP-FR45

C-MC-B-MP-FR60

Product Specification

Wood-based particleboard core

Mineral Core

Typical Core Density

32-36 lbs./ft³ (513-577 kg/m3)

~18 lbs./ft³ (288 kg/m³)

Door Thickness

1-3/4”

1-3/4”

Maximum Size

Sizes shown below are for 1-3/4” thick doors. Contact sales for information regarding other door thickness types.

Singles up to 3’0” x 8’0”

Pairs up to 6’0” x 8’0”

Singles up to 3’0” x 8’0”

Pairs up to 6’0” x 8’0”

Fire Rating

20-Minute

45-60 Min

Environmental Options

TSCA Title VI / CARB Phase 2 compliant

• TSCA Title VI / CARB Phase 2 compliant • ULEF/NAUF upon request

EPD

Yes

Yes

Quality Standards

WDMA I.S. 1A Architectural Wood Flush Doors (Standard Construction)

WDMA I.S.1A Architectural Wood Flush Doors (Standard construction)

WDMA Performance Duty Level

N/A

N/A

Door Weight

1-3/8” – 4.3 lbs./sf

1-3/4” – 5.5 lbs./sf