Views: 0 Author: Site Editor Publish Time: 2026-08-10 Origin: Site
Woven roving is one of the most widely used fiberglass reinforcements in FRP manufacturing. It is commonly selected for boats, tanks, automotive parts, industrial panels, pipes, profiles, and other composite structures where high glass content, good mechanical strength, and efficient laminate build-up are required.
Among the available weights, 600gsm and 800gsm woven roving are two of the most common choices.
Although both materials are manufactured from continuous fiberglass rovings woven into a bidirectional fabric, their different areal weights affect laminate thickness, resin consumption, drapability, production efficiency, and final mechanical performance.
So how should an FRP manufacturer choose between 600gsm and 800gsm woven roving? This guide explains the main differences and helps manufacturers select the appropriate fiberglass reinforcement according to laminate design, processing method, part geometry, and production requirements.
Table of Contents
Fiberglass woven roving is a heavy reinforcement fabric made by weaving continuous glass fiber rovings in the warp and weft directions.
Unlike chopped strand mat, where fibers are randomly distributed, woven roving has continuous fibers arranged mainly at 0° and 90°. This structure provides relatively high tensile strength and stiffness in both principal directions.
Applicable resin systems:
1. Unsaturated polyester resin
2. Vinyl ester resin
3. Epoxy resin
4. Other compatible thermosetting resin systems
Processing methods: It can be processed by hand lay-up, vacuum-assisted processes, compression molding, and other composite manufacturing methods depending on the product construction.
Common woven roving weights:
1. 200gsm、300gsm、400gsm
2. 600gsm、800gsm
3. Other customized weights
For many general FRP applications, 600gsm and 800gsm are especially popular because they provide a good balance between laminate build-up efficiency and handling performance.
The term “gsm” means grams per square meter, referring to the areal weight of the woven roving fabric.
1. 600gsm woven roving: Approximately 600 grams per square meter
2. 800gsm woven roving: Approximately 800 grams per square meter
800gsm fabric contains approximately 33% more glass fiber per square meter than 600gsm fabric. This core difference leads to distinct performance gaps: 800gsm realizes faster laminate thickness build-up, while 600gsm features easier handling and better conformity to complex surfaces.
Property 600gsm Woven Roving 800gsm Woven Roving
Areal weight Approx. 600 g/m² Approx. 800 g/m²
Laminate build-up Moderate Faster
Fabric handling Easier Heavier
Drapability Generally better Generally lower
Complex shapes adaptability More suitable Better for flat/simple surfaces
Number of layers required Usually more Usually fewer
Resin demand per layer Lower Higher
Production efficiency Good Higher for thick laminates
Typical use scenario General FRP structures Heavy-duty and thicker laminates
600gsm woven roving is a versatile reinforcement for medium- to heavy-duty FRP laminates, with an optimal balance of fiber weight and processability.
Lighter and more flexible than 800gsm fabric, it fits curved and moderately complex mold surfaces perfectly, effectively reducing bridging and wrinkles at geometric corners and curved parts.
Typical applicable products: Boat hulls, curved panels, covers, molded enclosures, storage tanks, automotive composite parts
In hand lay-up processes, the lightweight feature makes positioning, wetting out, rolling and compaction of the fabric simpler, especially for large-size materials. It significantly improves production consistency for factories relying on manual laying.
It provides stable continuous glass reinforcement without overly thick single layers, allowing flexible combination with multiple auxiliary reinforcement materials:
1. Chopped strand mat
2. Fiberglass cloth
3. Multiaxial fabrics
4. Surface tissue
Alternating lay-up with different materials optimizes interlaminar bonding, surface quality and overall structural performance.
Suitable for scenarios requiring high strength and good mold conformity, including marine laminates, storage tanks, vehicle components, industrial covers, FRP sheets and general molded structures.
800gsm woven roving features higher single-layer fiber content, and its core advantage is efficient laminate thickness build-up.
With 33% more fiberglass per square meter, it reduces the number of laying layers required to reach the target laminate thickness, greatly improving production efficiency for thick structures.
Typical applicable products: Large FRP tanks, heavy industrial components, thick structural panels, marine heavy-duty structures, large molded parts
It can import more continuous glass fiber in a single process, meeting high-strength design requirements. It is worth noting that the final mechanical performance is not only determined by fabric weight, but also affected by:
1. Fiber orientation & volume fraction
2. Resin system matching
3. Laminate compaction & void content
4. Fiber wet-out quality & overall structural design
Each fabric layer requires cutting, positioning, impregnation, compaction and inspection. Fewer laying layers directly reduce labor time, with more obvious efficiency advantages for simple and flat large-scale molds.
1. 600gsm: Lighter fiber structure, easier resin penetration and full wet-out in manual operation, less prone to dry fibers, white spots and void defects.
2. 800gsm: Thicker fiber bundles require lower resin viscosity and standardized rolling processes to achieve complete impregnation. Improper operation easily causes poor lamination quality.
Fiberglass sizing compatibility with resin is the key factor affecting wet-out effect. JLON Composite can customize fabrics matching various mainstream resin systems.
1. Single layer: 800gsm consumes more resin than 600gsm due to higher fiber content.
2. Overall laminate: 800gsm requires fewer total layers, so the total resin consumption will not increase proportionally with fabric weight.
The actual resin demand is affected by reinforcement type, target glass content, processing technology and operator technique, and shall be calculated based on the complete laminate schedule.
1. 600gsm priority scenario: Complex curved surfaces, special geometric structures, scenarios requiring flexible operation and high lamination consistency.
2. 800gsm priority scenario: Large flat structures, thick laminates, scenarios pursuing rapid production and high efficiency.
1. 600gsm: Suitable for curved marine parts, including boat hull laminates, decks, covers and interior molded parts, relying on excellent drapability to fit complex hull shapes.
2. 800gsm: Suitable for thick and heavy marine structures, including heavy hull sections, large molded structures and workboat components, realizing rapid thickening of high-strength laminates.
1. Choose 600gsm if: The mold has complex geometry, manual operation is dominant, the required laminate thickness is moderate, and multiple reinforcement materials need to be combined.
2. Choose 800gsm if: The product is large-sized with simple surfaces, requires thick anti-corrosion and high-strength laminates, and pursues fast production and fewer laying layers.
Note: For anti-corrosion industrial structures, E-glass or ECR glass materials shall be selected according to the chemical environment.
It is a common mistake to judge fabric quality only by gsm and unit price. Even with the same gsm specification, product performance varies greatly due to quality differences. Key quality indicators include:
1. Stable areal weight: Avoid inconsistent laminate thickness and fiber content
2. Uniform weaving: Stable warp and weft alignment ensures predictable mechanical properties
3. Resin compatibility: Matching sizing system guarantees excellent wet-out and bonding
4. Low fuzz performance: Reduce fiber breakage to ensure smooth production and stable lamination quality
5. Stable roll quality: Consistent width and winding tension adapt to industrial mass production
The two specifications can be used in the same laminate in a targeted manner according to local structural and processing needs:
1. Curved and transition areas: Adopt 600gsm for better fitting effect
2. Large flat thick areas: Adopt 800gsm to improve production efficiency
3. Auxiliary matching: Cooperate with chopped strand mat, surface tissue and multiaxial fabrics to optimize surface quality, anti-corrosion performance and directional strength
1. Molds have curved or complex geometric shapes
2. Easy manual handling and high lamination precision are required
3. Moderate laminate thickness is needed
4. Need to be compounded with various reinforcement materials
1. Thick laminate structure is required
2. Mold surface is large and flat with simple structure
3. Reduce laying layers and shorten production cycle
4. Production efficiency is the core demand
JLON Composite provides full-series fiberglass reinforcement materials for marine, transportation, construction and industrial FRP manufacturing. Our product lineup covers:
1. Fiberglass woven roving (600gsm/800gsm customizable)
2. Fiberglass cloth, chopped strand mat, continuous filament mat
3. Multiaxial fiberglass fabric, fiberglass roving, chopped strands
4. Fiberglass surface tissue and other supporting reinforcements
We provide one-stop material selection solutions according to customers' resin system, processing technology, part geometry and laminate design requirements.
Not absolutely. 800gsm has higher single-layer fiber content, but the final mechanical strength depends on the overall laminate design, fiber volume fraction, resin matching and processing quality, rather than gsm alone.
Yes, especially for hand lay-up. Its light weight and good flexibility make positioning and mold fitting simpler, effectively reducing defective rates.
Yes for thick laminates. Fewer laying layers reduce manual operations and shorten the production cycle, with more significant advantages for large simple parts.
Yes. It is widely used with unsaturated polyester resin, and can also be adapted to vinyl ester, epoxy and other thermosetting resin systems via customized sizing.
600gsm and 800gsm are the most versatile specifications for general FRP production. Special lightweight or heavyweight fabrics are adopted only for specific customized scenarios.
The core difference between 600gsm and 800gsm woven roving lies in single-layer fiberglass content:
1. 600gsm: Balances processing performance, mold conformity, wet-out effect and mechanical strength, suitable for most general and complex FRP structural parts.
2. 800gsm: Focuses on efficient thickening and high productivity, suitable for large, flat, thick heavy-duty FRP laminates.
Material selection must comprehensively consider part geometry, laminate schedule, resin system, production process and performance requirements, instead of simply judging by gsm parameter.
If you need customized selection and scheme guidance for 600gsm/800gsm woven roving for your FRP projects, please contact JLON Composite. We will provide targeted product specifications and application solutions according to your actual demand.
