Glass-epoxy laminate guide
G-10 CNC
Machining
CNC-machined G-10 glass-epoxy blocks, plates and insulating supports, with laminate form, direction and edge acceptance matched to the drawing.
Confidential enquiries. NDA available.
- Specify
- G-10 sheet by product and standard or named alternative
- Review
- Sheet plane and Mounting hole
- Confirm
- Final condition and acceptance records
Choose a glass-epoxy support around its load path.
G-10 is a glass-fabric epoxy laminate designation used for rigid insulating and structural details. The product, laminate direction and machining form should be chosen together.
Insulating spacers
Define the working electrical requirement, thickness and mounting arrangement. Mark surfaces and edges where contamination or damage is unacceptable.
Structural blocks and supports
Show load direction and fastener interfaces. Identify whether the part is cut from sheet, rod or a rolled or molded laminate form.
Fixtures and specialty equipment
State temperature, moisture and any cryogenic or other application conditions. A general G-10 callout is not a specialty-service approval.
Choose the grade and stock together.
Compare the Garolite G-10 options below against the drawing and service conditions. Specify the complete supplier grade, condition and stock form; material examples do not establish current inventory or permit substitutions.
| Grade or stock | Why consider it | What to resolve |
|---|---|---|
| G-10 sheet by product and standard | Plates, spacers and blocks cut from a specified sheet laminate. | Define thickness, sheet plane, stock tolerance and critical dimensions. |
| Rolled or molded glass-epoxy rod/tube | Components whose load or geometry requires a particular laminate form. | Specify the form and direction; do not assume sheet-ground rod has the same construction. |
| Sheet-ground G-10 rod | A machined form made from cured laminate sheet. | Confirm the supplier product, orientation and applicable acceptance rather than assuming a rod standard. |
| Specialty glass-epoxy product | An application with a defined thermal, cryogenic or other requirement. | Name the actual product and governing tests. Do not extend generic G-10 properties to every environment. |
Selection examples are subject to material and drawing review. They are not an inventory list.
Already have a grade on the drawing?
Add it to your quotation checklist ↓Preserve the laminate around holes and edges.
The finished G-10 component needs both dimensional and edge-quality requirements. A tight hole location does not by itself define acceptable fibre breakout or delamination.
Direction and stock form
Show the sheet plane or relevant laminate construction. Identify the directions used in structural or electrical acceptance.
Mounting and thread design
Specify fastener load, edge distances and any inserts. Review whether a threaded laminate feature or a different connection suits repeated assembly.
Abrasive reinforcement and edges
Use a machining route appropriate to the glass reinforcement. Mark chip-sensitive contours and define cleanliness and loose-fibre acceptance.
Mark critical dimensions on the drawing. Achievable tolerances, wall thickness, part size and delivery are confirmed for the geometry, material, finish and quantity in the quotation.
Specify the cut surface and protected insulating path.
Machined profiles
Define chips, edge breaks, fibre exposure and visible tool marks. Identify tight-fitting and electrically relevant surfaces.
Sealing or coating if required
Name the coating system, masked faces and acceptance. Avoid adding a generic treatment that changes dimensions or electrical requirements.
Cleaning and marking
Define compatible cleaning, residue limits and durable identification. Include handling that protects narrow edges and mounting details.
Check laminate identity, direction and finished details.
Product and form
Request the manufacturer designation, relevant G-10 standard and stock construction records.
Dimensional inspection
Define thickness, flatness, hole locations and datum relationships. Identify free or supported inspection where relevant.
Edge and application acceptance
Set permitted breakout and delamination. Add electrical, thermal or specialty-service tests only with defined methods and conditions.
Three different checks.
The material record identifies the purchased stock. The inspection report checks the drawing. Application validation checks the part in service.
Review inspection requirements ↗G-10 machining questions.
Answers to the decisions that affect the material, drawing and finished part.
Does Garolite always mean G-10?
The commercial name can be used broadly for laminate products. Specify the exact G-10 grade, manufacturer product and stock form rather than relying on the name alone.
Is G-10 automatically flame-retardant FR-4?
No. Check the governing standard and product evidence. Similar glass-epoxy construction does not establish the required flame performance.
Are sheet-ground and rolled rods equivalent?
Not automatically. Their laminate construction and orientation can differ. Review the stock form and applicable product specification.
Can a G-10 part be used at cryogenic temperature?
A specialty-service requirement needs the exact laminate, material data, geometry and validation. The generic grade designation is insufficient by itself.
What should be specified around mounting holes?
Provide position, diameter, edge distance, fastener load, permitted breakout and any insert or repeated-assembly requirement.
What information supports a G-10 machining quote?
Include manufacturer product, standard, form, laminate direction, drawing, edge criteria, environment, quantity and the required documents or application tests.
Prepare your enquiry
Review the G-10 construction and the loaded geometry.
Send the CAD model and dimensioned drawing with quantities, service conditions and the requirements below. If the grade is undecided, describe the function and the constraints.
Your files stay confidential. NDA available.
G-10 RFQ checklist
Material: G-10, [manufacturer product + applicable standard] Construction: [sheet / rolled or molded rod / sheet-ground rod / tube] Orientation: [laminate direction and relevant load path] Features: [holes, edge distances, inserts, profiles] Acceptance: [breakout, delamination, electrical or specialty tests] Quantity and records: [lot size, stock and inspection documents]
Material references & specification notes
Manufacturer information supports material selection. Use the datasheet for the exact grade, stock form and test conditions. It does not establish Prolean inventory, application approval or a guaranteed machining result.
Prepared October 2026. Final material and manufacturing requirements are agreed in the quotation.