Cutting, Drilling & Cut-Outs
Right Tools for a Clean Cut
| Tool | Best For | Note |
|---|---|---|
| Carbide-tipped circular saw | Straight cuts, field trimming, pultruded bars | Cleanest edge; support panel on both sides of cut |
| Abrasive cut-off wheel (angle grinder) | Notching, cut-outs, awkward shapes | Fast but more dust; keep wheel guarded |
| Masonry / diamond saw | Heavy cuts, thick panels | Wet cutting option controls dust |
| Hole saw / carbide burr | Round penetrations (pipes, conduit) | Drill from one side, finish from back to limit chipping |
Notches, Holes and Reinforcement
Plan the Cut-Out
Mark and dry-fit before cutting. Wherever a load path is interrupted by a cut-out, the remaining bearing bars lose continuity.
Reinforce Edges
Border cut-outs with FRU flat bar / angle welded (resin-bonded) around the opening to restore edge stiffness and protect against impact.
Corner Relief
Drill a small relief hole at internal cut-out corners to stop crack propagation — never leave a sharp square internal corner.
Finish the Cut Edge
Band the Edges
Factory-cut and site-cut edges are sharp and glass-frayed. Apply FRP edge banding / flat-bar edging for impact protection, safety and appearance.
Resin Touch-Up
Where cut edges expose bare glass, touch up with matching resin to restore corrosion protection and seal fibers against moisture ingress.
Cutting Safety — Non-Negotiable
Respiratory Protection
FRP dust is fibrous and abrasive. Wear a P2/P3 (N95+) dust respirator; wet cutting or local extraction reduces airborne dust.
Eyes & Hands
Safety glasses / face shield and cut-resistant gloves. Fiberglass splinters are irritating and sharp.
Dust Control
Never dry-grind in enclosed spaces without extraction. Vacuum (not sweep) dust; wash exposed skin.
Cut Quality and Edge Finish
The difference between a clean cut and a chipped one is technique: support the panel on both sides of the cut line, use sharp carbide tooling, and let the blade do the work without forcing. A clean cut leaves the glass fibres sealed in resin; a chipped or torn edge exposes fibre ends, which are the laminate's weak point under chemical splash and impact. Where edges are exposed to process chemicals, seal them with FRP banding or a resin sealant after cutting. Factory-cut panels arrive with sealed edges as standard — one reason pre-cutting to a drawing beats site cutting on corrosion-critical projects.
Cut-Out Reinforcement
- Plan the cut-out — mark and dry-fit before cutting; locate openings clear of bearing bar runs where possible.
- Reinforce edges — border large openings with FRP flat bar or angle, resin-bonded around the opening, to restore edge stiffness and protect the cut edge from impact.
- Corner relief — drill a radius at cut-out corners before sawing to prevent crack initiation at sharp internal corners.
- Load-path check — wherever a cut-out interrupts bearing bars, verify the remaining section against the load chart; do not assume the full panel capacity remains.
Cutting Safety
FRP cutting produces glass-fibre dust that is a skin and respiratory irritant. Use wet cutting or a dust collector, wear eye protection, dust mask and gloves, and wash exposed skin after handling. Never use abrasive wheels without guarding, and cut in well-ventilated areas. These are the same precautions as for any glass-reinforced material — routine, but non-negotiable on site.
Factory vs. Site Cutting
For projects with openings, columns and irregular edges, factory cutting is cleaner, faster and cheaper per cut than field cutting: panels are machined to drawing with sealed edges, the cut plan is verified against the support layout before delivery, and site crew simply place and clip. Site cutting remains necessary for field adjustments — and the tools, reinforcement and safety practices above are exactly the ones to use when it is.
For projects with openings, columns and irregular edges, factory cutting is cleaner, faster and cheaper per cut than field cutting: panels are machined to drawing with sealed edges, the cut plan is verified against the support layout before delivery, and site crew simply place and clip. Site cutting remains necessary for field adjustments — and the tools, reinforcement and safety practices above are exactly the ones to use when it is.Prefer Factory-Fabricated Panels?
Send your drawings and cut-out schedules — ZeAllgrate ships panels pre-cut, drilled and banded.
Source: ZeAllgrate (Fiberglass Grating Manufacturers Council / ACMA) design guidelines; ASTM International; ISO 14122; OSHA 29 CFR 1910. Indicative data for specification guidance only — final design verified by ZeAllgrate engineering against certified load/span charts.