PETG Specifications — Sheet Sizes, Tolerances & Standards
PETG sheet, rod, and tube stock dimensions follow manufacturer published tolerance tables and, for sheet, often align with flat sheet optical tolerances. Unlike engineering plastics governed by ASTM standards (e.g., ASTM D6262 for PEEK), PETG sheet is primarily governed by producer specifications and industry practice for display and fabrication applications.
At a glance:
- Standard sheet: 48" × 96" (4'×8') primary size; 24"×48" and 36"×48" available
- Thickness range: 0.030" to 0.500" (and up to 1.0" for select applications)
- Thickness tolerance: ±0.005" to ±0.015" depending on gauge
- Rod: 0.250"–6.0" diameter; tube: OD/ID combinations to order
- FDA 21 CFR 177.1630; RoHS compliant; no specific ASTM standard for PETG display sheet
Sheet Size and Tolerance Standards
Standard Sheet Sizes
PETG sheet is primarily produced in the display and sign industry format:
| Standard Sheet Size | Common Availability |
|---|---|
| 48" × 96" (4′ × 8′) | Stock — most gauges |
| 48" × 120" (4′ × 10′) | Available from select suppliers |
| 36" × 48" | Stock in some gauges |
| 24" × 48" | Available; cut from larger sheets |
Sheets are extruded to width and cut to length. Actual dimensions may vary ±0.125" on width and length from nominal.
Thickness Range and Tolerances
| Nominal Thickness | Typical Tolerance |
|---|---|
| 0.030" | ±0.003" |
| 0.060" | ±0.005" |
| 0.093" | ±0.005" |
| 0.125" | ±0.007" |
| 0.187" | ±0.007" |
| 0.250" | ±0.010" |
| 0.375" | ±0.012" |
| 0.500" | ±0.015" |
Tolerances are for as-extruded sheet. Precision-thickness requirements can be achieved by surface grinding, though this is uncommon for PETG.
Flatness
Flatness of PETG sheet varies by thickness:
- Thin gauges (≤0.125") may exhibit slight bow — typically within 0.020" per foot
- Thicker gauges (≥0.250") are generally flat to within 0.010" per foot
For thermoforming applications, flatness of incoming sheet is critical to even heating — warped sheet can cause uneven temperature distribution and forming defects.
Rod Specifications
PETG rod (clear) is available as a standard stock item in common diameters:
| Diameter Range | OD Tolerance | Length |
|---|---|---|
| 0.250" – 0.750" | ±0.010" | 4 ft |
| 0.750" – 1.5" | ±0.015" | 4 ft |
| 1.5" – 3.0" | ±0.020" | 4 ft |
| 3.0" – 6.0" | ±0.030" | 4 ft |
PETG rod is less widely stocked than sheet — confirm specific diameters with FedMat before specifying.
Applicable Standards and Testing
PETG sheet and rod are tested to standard ASTM methods for reporting properties:
| Property | Test Method |
|---|---|
| Tensile strength, modulus, elongation | ASTM D638 |
| Flexural strength and modulus | ASTM D790 |
| Izod impact, notched | ASTM D256 |
| Heat deflection temperature | ASTM D648 |
| Light transmission and haze | ASTM D1003 |
| Density | ASTM D792 |
| Water absorption | ASTM D570 |
| Flammability (HB) | ASTM D635 or UL 94 HB |
There is no single ASTM product standard governing PETG display and fabrication sheet equivalent to ASTM D6262 (PEEK) or D7292 (PET-P). Properties are confirmed per producer data sheets and lot testing.
Regulatory and Environmental
Engineering Drawing Notation
Suggested material callout for PETG on engineering drawings:
- Material: "PETG, amorphous copolyester per Eastman PETG specifications or equivalent; clear natural color"
- For food contact: add "FDA 21 CFR 177.1630 compliance required; COC required per lot"
- Tolerances: machined features hold ±0.003" (turned) to ±0.005" (milled) without difficulty on PETG
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