Impervious Graphite
GB GB/T 12762
Impervious Graphite is a fine-grain graphite vacuum-pressure impregnated with phenolic or furan resin (or PTFE) to close open porosity, covered by GB/T 12762 in PH, FU, PTFE and ISO-FG variants.
Reference datasheet — Impervious Graphite is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the PH condition
Impervious Graphite tempers and conditions
Impervious Graphite is supplied in 3 conditions, soft to hard. PH is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PTFE / fluoropolymer impregnated graphite | Use for very aggressive or high-purity duty (HF, mixed halide acids, pharma) where resin extractables are unacceptable. | 20 | 0.4 | 20 HV | 100 W/m·K | |
Furan-resin impregnated graphite | Pick when service is hotter (to ~190–200 °C) or contains alkali/solvent mixtures that swell phenolic. | 24 | 0.3 | 25 HV | 110 W/m·K | |
PHDefault Pre-hardened | Standard choice for hydrochloric/sulfuric/phosphoric acid heat exchangers and columns up to about 170 °C. | 25 | 0.3 | 50 HV | 125 W/m·K |
Supply forms, finishes and certifications
Ways Impervious Graphite is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ISO-FG | Isostatically pressed ultra-fine-grain base, resin impregnated | Certification |
What is Impervious Graphite?
Impervious Graphite is a fine-grain graphite vacuum-pressure impregnated with phenolic or furan resin (or PTFE) to close open porosity, covered by GB/T 12762 in PH, FU, PTFE and ISO-FG variants. It combines 125 W/m·K thermal conductivity with resistance to most acids (corrosion score 88), which makes it the standard tube, block and plate material for graphite heat exchangers and acid service. The resin binder caps service temperature at about 170 °C and tensile strength at 25 MPa, so it is not a structural or high-temperature material; for hotter duty use bare or SiC-coated graphite. Impervious Graphite has a density of 1.8 g/cm³ (0.065 lb/in³), lighter than 89% of ceramic grades. Impervious Graphite has a tensile strength of 25 MPa (3.63 ksi), weaker than 85% of ceramic grades. Elongation at break is 0.3% and the elastic modulus is 12 GPa (1.74 Msi).
What is Impervious Graphite used for?
- heat exchangers
- acid coolers
- reaction vessels
- chemical process piping
Advantages
- Ductile — tolerates forming and impact — 0.3%, better than 91% of ceramic grades
- Conducts heat well — 125 W/m·K (72.2 BTU/hr·ft·°F), better than 90% of ceramic grades
- Lightweight — 1.8 g/cm³ (0.065 lb/in³), better than 89% of ceramic grades
- Easy to machine — 80/100, better than 89% of ceramic grades
- Good corrosion resistance — 88/100, better than 77% of ceramic grades
Limitations
- Low stiffness — 12 GPa (1.74 Msi), worse than 89% of ceramic grades
- Hard to polish — 45/100, worse than 88% of ceramic grades
- Limited service temperature — 170°C (338 °F), worse than 87% of ceramic grades
Impervious Graphite properties
Typical room-temperature values for Impervious Graphite-PH; bars are the position among ceramic grades.
Physical2
Impervious Graphite has a density of 1.8 g/cm³ (0.065 lb/in³), lighter than 89% of ceramic grades.
Mechanical10
Impervious Graphite has a tensile strength of 25 MPa (3.63 ksi), weaker than 85% of ceramic grades. Elongation at break is 0.3% and the elastic modulus is 12 GPa (1.74 Msi).
Thermal5
Impervious Graphite is rated for continuous service to 170°C (338 °F). It conducts heat at 125 W/m·K (72.2 BTU/hr·ft·°F), better than 90% of ceramic grades. Thermal expansion is 4.5 µm/m·K (2.5 µin/in·°F).
Electrical2
Impervious Graphite has an electrical resistivity of 1.2×10⁻⁵ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (88/100), better than 77% of ceramic grades.
Sustainability3
Producing a kilogram of Impervious Graphite takes about 190 MJ of energy and emits 14 kg of CO₂ — more than 62% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
Impervious Graphite's machinability is very good (80/100, better than 89% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. Impervious Graphite is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Impervious Graphite
Is Impervious Graphite easy to machine?
Machines fast with carbide or PCD dry-cut tooling, but dust is abrasive and electrically conductive — vacuum extraction and sharp positive-rake tools are mandatory to avoid edge chipping.
Can Impervious Graphite be welded?
Not weldable; joints are made with corrosion-resistant carbon-filled resin cements or mechanically flanged with PTFE gaskets.
Can Impervious Graphite be formed, bent or molded?
Shape is produced by extrusion/moulding or isostatic pressing of the green body, baking and graphitising, then vacuum-pressure resin impregnation and cure — no post-cure forming is possible.
Impervious Graphite chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| phenolic or furan resinimpregnant, cured; PTFE in the fluoropolymer variant | 10 – 18 | 14 |
| ashtypical for corrosion grades | 0 – 0.3 | 0.1 |
| S | 0 – 0.05 | 0.02 |
| C (graphite matrix)graphitised petroleum-coke / pitch body | ≥ 82 (balance) |
What surface finishes work on Impervious Graphite?
Surfaces are ground or lapped; no coating is normally used, and any surface resin skin should be removed to expose the impregnated body for good heat transfer.
Equivalent designations
Standards and trade names that resolve to Impervious Graphite in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- GB/T 12762
How much does Impervious Graphite cost?
Impervious Graphite is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Impervious Graphite — frequently asked
What is Impervious Graphite used for?
Impervious Graphite is typically used for heat exchangers, acid coolers, reaction vessels and chemical process piping. In short: zero-porosity acid-service graphite; high conductivity, acid-proof; resin limits use to 170 °C.
What is the tensile strength of Impervious Graphite?
Impervious Graphite has a typical tensile strength of 25 MPa (3.63 ksi) — weaker than 85% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is Impervious Graphite easy to machine?
Yes — machinability is rated very good (80/100, better than 89% of ceramic grades). Machines fast with carbide or PCD dry-cut tooling, but dust is abrasive and electrically conductive — vacuum extraction and sharp positive-rake tools are mandatory to avoid edge chipping.
Can Impervious Graphite be welded?
Not weldable; joints are made with corrosion-resistant carbon-filled resin cements or mechanically flanged with PTFE gaskets.
What surface finishes work on Impervious Graphite?
Surfaces are ground or lapped; no coating is normally used, and any surface resin skin should be removed to expose the impregnated body for good heat transfer.
Can Impervious Graphite be formed, bent or molded?
Shape is produced by extrusion/moulding or isostatic pressing of the green body, baking and graphitising, then vacuum-pressure resin impregnation and cure — no post-cure forming is possible.
What is the maximum service temperature of Impervious Graphite?
Impervious Graphite is rated for continuous use to about 170°C (338 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Impervious Graphite cost?
Impervious Graphite is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- Graphilor impervious graphite grades — Mersen (2022)
- DIABON impregnated graphite for process equipment — SGL Carbon (2021)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses (carbon/graphite section) — ASM International (1991)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.