Polyester and Vinyl Ester Resins

CEM Resin Solutions

Versatility and Reliability

Composite Essential Materials offers a reliable line of general purpose resins designed to meet the everyday needs of composite manufacturers and fabricators. Our resin selection includes high-quality polyester and vinyl ester resins that deliver dependable performance across a wide range of applications. Whether you're working on marine, automotive, construction, or industrial projects, our resins provide excellent strength, durability, and ease of use. Formulated for consistent curing, optimal adhesion, and smooth laminating, these versatile resins are a trusted choice for fiberglass layups, repairs, and production runs. Backed by our commitment to quality and customer service, CEM’s resin helps you build with confidence.

Polyester

Resin

Open-Mold Resins

CEM’s Open-Mold Resins are formulated for reliable performance in traditional composite manufacturing processes such as hand lay-up and spray-up. These resins provide excellent wet-out of reinforcement fibers, consistent curing behavior, and strong mechanical performance for a wide range of composite applications. Designed for ease of use and dependable processing, CEM’s open-mold resins help manufacturers produce durable, high-quality parts with good surface finish and efficient shop-floor handling.

General Purpose

CEM 200

100% Orthophthalic Resin

Outstanding secondary bonding
Blue catalyst indicator
Fast glass wet-out

CEM 250

DCPD/Orthophthalic Resin

Excellent mechanical properties
Superior surface cosmetics
Rapid Barcol progression
Low VOC

CEM 550

DCPD/Isophthalic Resin

Enhanced mechanical properties
Superior elongation for resilient part
Higher resistance to water osmosis
Low VOC

Premium

CEM 500

100% Isophthalic Resin

Corrosion resistance
Very good resistance to osmotic blistering
Rapid Barcol progression
Superior glass wet-out

CEM 100

100% Vinyl Ester Resin

Superior corrosion resistance
Outstanding resistance to osmotic blistering
High HDT
Excellent mechanical properties

Close-Mold Resins

CEM’s Close-Mold Resins for Infusion are engineered for high-performance composite manufacturing using processes such as vacuum infusion and resin transfer molding (RTM). These resins offer excellent flow characteristics for efficient fiber wet-out, low viscosity for consistent mold filling, and controlled cure profiles that support complex part geometries and large structures. Designed to deliver strong mechanical properties, durability, and high fiber volume fractions, CEM’s infusion resins help manufacturers achieve reliable, high-quality composite parts with reduced void content and improved surface finish.

CEM I-491 Series

100% Orthophthalic Resin

Low viscosity and medium reactivity
Excellent glass wet-out
Excellent mechanical properties
Improved surface quality

CEM I-380 Series

DCPD/Orthophthalic Resin

Fast fill time for vacuum infusion systems
Improved surface quality
Low shrinkage

CEM I-200 Series

Modified Vinyl Ester Resin

Excellent mechanical properties
Superior cosmetics
Outstanding resistance to osmotic blistering
Fast curing

CEM I-103 Series

High Performance Vinyl Ester Resin

Outstanding mechanical properties
Low viscosity and medium reactivity for less foaming
Outstanding resistance to osmotic blistering

Plug-to-Mold Resins

CEM’s Plug-to-Mold Resins are high-performance resin systems designed for producing durable, dimensionally stable molds directly from master plugs. These resins offer excellent surface reproduction, low shrinkage, and strong mechanical properties, making them ideal for composite tooling applications. Engineered for reliability and ease of processing, CEM’s plug-to-mold resins help manufacturers create precise molds that maintain surface quality and structural integrity through repeated production cycles.

NORESTER 6779

Hybrid Polyester Resin

Outstanding compatibility with the polystyrene
Creates a barrier between the styrofoam and the mold putty
Rapid Barcol progression
Excellent glass wet-out

Nord Core
Lite 807

Polyester-based Sprayable Putty

Low shrinkage and low exotherm system
Easy build up for consecutive layers
Low density for easy CNC machining
Excellent bonding to NORESTER 6779

CEM Core Plug 85

Extrudable Isophthalic Paste

Low shrinkage to preserve the master dimensions
Low exothermic peak to prevent surface distortion
Easy to machine
No dust or tear during machining
Low VOC comparable with sprayable versions

Nord Appret 230

Sprayable Polyester Primer

Excellent surface finish
Good spreadability without run-off
Good filling properties
Outstanding sandability
Good adhesion to mold putties/wood/tooling boards

Nord Lacquer 210

Sprayable Polyester Lacquer

Premium surface finish
Excellent gloss
Rapid Barcol progression
Black color for easy quality control on the plug