HDPE Weight Calculator
Calculate HDPE sheet, rod, and tube weight for all grades — natural, UV-stabilized, pipe grade, and HMW-HDPE
HDPE Weight Calculator
Calculation Results
Grade Quick Reference
Formula Used
HDPE Grade Specifications
Density per ASTM D792 / ISO 1183. Tensile strength per ASTM D638. Maximum service temperature for continuous use.
| Grade | Density (g/cm³) | Tensile Strength | Max Temp | Chemical Resistance | FDA |
|---|---|---|---|---|---|
| HDPE Natural — General Purpose | 0.955 | 22–31 MPa | 82°C / 180°F | Excellent | Yes |
| HDPE Black — UV-Stabilized | 0.955 | 22–31 MPa | 82°C / 180°F | Excellent | No |
| HDPE Pipe Grade — PE4710 | 0.955 | 24–31 MPa | 82°C / 180°F | Excellent | Yes* |
| HMW-HDPE — High Molecular Weight | 0.940 | 17–24 MPa | 82°C / 180°F | Excellent | Varies |
Standards: ASTM D3350 (pipe-grade HDPE), ASTM D4976 (molding/extrusion materials). FDA compliance per 21 CFR 177.1520 (natural grade). *PE4710 pipe grade meets NSF/ANSI 61 for potable water pipe. RoHS compliant across all grades.
Which HDPE Grade Should You Use?
HDPE grades share the same base polymer but differ in molecular weight, additives, and certifications. The right grade depends on application environment and compliance requirements.
HDPE Natural — General Purpose
The workhorse grade. FDA compliant, naturally white or off-white, suitable for direct food contact per 21 CFR 177.1520. Use for cutting boards, tank liners, marine parts, conveyor components, and general machined parts. Excellent chemical resistance and easy to machine. The default choice unless UV resistance or pressure pipe rating is required.
- Density: 0.955 g/cm³
- Best choice for: cutting boards, food equipment, general machining
- FDA 21 CFR 177.1520 and NSF 51 compliant
HDPE Black — UV-Stabilized
Carbon black provides UV stabilization and blocks UV degradation that would cause standard HDPE to become brittle outdoors. Mechanically identical to natural grade. Use for outdoor applications: marine dock fenders, agricultural tank covers, outdoor pallets, and exposed structural panels. Not FDA compliant due to carbon black — do not use for food contact.
- Density: 0.955 g/cm³ — same as natural for weight purposes
- Best choice for: outdoor, UV-exposed, marine applications
- Carbon black makes it non-FDA — not for food contact
HDPE Pipe Grade — PE4710
PE4710 is the cell classification designation under ASTM D3350 for pressure-rated HDPE pipe resin. The "4710" specifies minimum required density (0.947), flexural modulus (550 MPa), and ESCR properties for pressure applications. Required when sizing pipe by pressure rating — the same resin in natural sheet form is also used for machined fittings and flanges that mate with PE pipe systems.
- Density: 0.955 g/cm³
- Best choice for: pressure pipe, fittings for PE pipe systems, water distribution
- NSF/ANSI 61 listed for potable water pipe applications
HMW-HDPE — High Molecular Weight
Molecular weight in the 200,000–500,000 g/mol range — higher than standard HDPE but lower than UHMWPE. Better wear resistance and impact strength than standard HDPE, at a lower density (0.940 g/cm³). Used for tank liners, pipe liners, and wear pads where UHMWPE performance is desired but the cost or difficulty of machining UHMWPE cannot be justified.
- Density: 0.940 g/cm³ — lightest HDPE grade by density
- Best choice for: tank liners, wear parts, hopper liners
- Better abrasion resistance than natural HDPE
Standard Stock Sizes
Common stock dimensions for HDPE sheet, rod, and tube. Confirm availability with your supplier before ordering. Standard sheet size is 48" × 96" (4 ft × 8 ft).
S Sheet Stock
Available thicknesses (48" × 96" sheets):
R Rod Stock
Standard 8 ft lengths. Available diameters:
T Tube Stock
Common OD × wall thickness combinations:
Common HDPE Applications by Industry
HDPE's combination of chemical resistance, low density, FDA compliance, and low cost makes it one of the most widely used engineering plastics across industries.
Food Processing and Packaging
- Cutting boards and butcher blocks
- Natural HDPE sheet — FDA compliant, NSF 51, easy to sanitize, self-healing surface
- Conveyor wear strips and guide rails
- Natural HDPE rod and strip — food safe, low friction, easily machined to size
- Milk and juice container bodies
- HDPE blow-molded containers — the standard material for dairy and juice packaging
Marine and Outdoor
- Dock fenders and pile guards
- UV-stabilized black HDPE — absorbs impact, resists saltwater, outlasts wood
- Boat components and marine hardware
- Natural or UV-stabilized HDPE — will not corrode or absorb water
- Outdoor furniture and playground equipment
- UV-stabilized black HDPE — resists cracking and fading in extended outdoor exposure
Chemical and Industrial Processing
- Chemical storage tanks and tank liners
- Natural HDPE sheet — excellent resistance to acids, alkalis, and solvents
- Pipe and fittings for corrosive fluids
- PE4710 pipe grade — pressure-rated, corrosion-free alternative to metal pipe
- Semiconductor and clean room equipment
- Natural HDPE — chemically pure, does not contaminate process chemicals
Infrastructure and Construction
- Potable water and gas distribution pipe
- PE4710 HDPE — NSF/ANSI 61 listed, flexible, corrosion-proof alternative to metal
- Drainage and stormwater pipe
- HDPE corrugated pipe — light weight, high flow capacity, resists root intrusion
- Geomembrane liners for ponds and containment
- HDPE sheet — impermeable, chemical resistant, used for landfill and pond liners
HDPE vs LDPE: Which Should You Choose?
Both are polyethylenes — HDPE (high-density) and LDPE (low-density) are the two most common forms. Their differences come down to stiffness, density, and application fit.
Choose HDPE When:
- + Structural rigidity is required — HDPE is 5–10× stiffer than LDPE
- + The part must hold a shape under load — LDPE deforms, HDPE holds
- + Higher service temperature is needed — HDPE handles 82°C vs 60°C for LDPE
- + Machining or cutting is required — HDPE machines cleanly, LDPE gums up on tooling
Choose LDPE When:
- + Flexibility is required — LDPE is soft and pliable, used in squeeze bottles and films
- + Vapor/moisture barrier films or bags are the application
- + The lowest possible density is needed — LDPE is 0.91–0.93 g/cm³ vs HDPE's 0.94–0.96 g/cm³
- + Extremely low-temperature performance is required — LDPE remains flexible at -40°C
Density note: HDPE (0.955 g/cm³) is about 3–5% denser than LDPE (0.910–0.930 g/cm³). Both float in water. Use our HDPE vs LDPE comparison tool to compare these materials directly side-by-side.
Processing and Machinability Notes
HDPE is one of the easiest engineering plastics to machine and fabricate, but its waxy surface and thermal expansion require attention.
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1
Excellent machinability — no pre-drying required
HDPE machines cleanly with standard cutting tools at normal speeds. No moisture absorption means no pre-drying or conditioning is needed before machining — unlike nylon or ABS. Carbide tooling is not required for most operations; HSS tools work well. Coolant is not necessary but an air blast prevents chip re-welding.
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2
High thermal expansion — allow clearance for fastened assemblies
HDPE has a coefficient of thermal expansion approximately 12× that of steel. Parts that span long distances or are rigidly fastened must account for expansion and contraction with temperature change. Use slotted holes rather than fixed holes for fasteners. Allow material to acclimate to shop temperature before cutting tight-tolerance parts.
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3
Hot gas welding is the preferred joining method
HDPE welds well with HDPE filler rod at 220–260°C using hot gas or extrusion welding. Tank construction, pipe fittings, and large-format liners are routinely fabricated this way. Butt welds achieve 70–90% of parent material strength. HDPE cannot be solvent bonded — it has no solvents that leave behind a strong bond.
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4
Adhesive bonding is difficult — surface treatment required
HDPE's low surface energy makes most adhesives fail. For adhesive applications, treat the surface with corona discharge, flame, or plasma treatment immediately before bonding. Two-part urethane adhesives and some structural acrylics work after surface treatment. Mechanical fastening is more reliable for structural joints.
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5
Standard HDPE degrades outdoors — specify UV-stabilized for exposed applications
Natural HDPE will become chalky and brittle within 1–2 years of direct UV exposure. Carbon black UV-stabilized (black) HDPE resists UV degradation effectively. For outdoor applications requiring colors other than black, UV-stabilized colorant systems are available but must be specified — do not assume a colored HDPE is UV-stabilized without confirmation.
Standards and Certifications
D3350: Standard Specification for Polyethylene Plastics Pipe and Fittings Materials (covers PE4710 pipe grade). D4976: Standard Specification for Polyethylene Plastics Molding and Extrusion Materials.
Olefin polymers permitted for use in articles intended for food contact. Applies to natural HDPE produced from compliant formulations. NSF 51 (food equipment) applies for commercial kitchen and food processing applications.
Drinking Water System Components — Health Effects. PE4710 pipe grade HDPE is NSF/ANSI 61 listed for potable water pipe and fittings. Required for water distribution, municipal, and plumbing applications.
RoHS Compliance
All HDPE grades listed are RoHS compliant. HDPE does not contain restricted heavy metals or halogenated flame retardants. Carbon black UV-stabilized grades contain carbon black — this is not a restricted substance under RoHS.
USDA Acceptance
Natural HDPE is USDA-acceptable for use in meat and poultry processing equipment and facilities. NSF 51 certification is typically required for commercial food equipment — verify the specific listing with your supplier.
Frequently Asked Questions
What is the density of HDPE?
Standard HDPE has a density of 0.941–0.965 g/cm³. General purpose natural HDPE and UV-stabilized black HDPE are both 0.955 g/cm³. PE4710 pipe-grade HDPE is also 0.955 g/cm³. HMW-HDPE is slightly lower at 0.930–0.945 g/cm³ due to its higher molecular weight. All HDPE grades are less dense than water (1.00 g/cm³) and will float. This low density is one of HDPE's key advantages in applications that need structural strength without the weight of metals or denser plastics.
How do I calculate the weight of an HDPE sheet?
For metric: Weight (g) = Length (mm) × Width (mm) × Thickness (mm) ÷ 1000 × Density (g/cm³). For a 1000 mm × 500 mm × 12 mm sheet of natural HDPE at 0.955 g/cm³: (1000 × 500 × 12) ÷ 1000 × 0.955 = 6,000 × 0.955 = 5,730 g (5.73 kg). For imperial dimensions, switch to the imperial toggle above and enter dimensions in inches — the calculator converts automatically.
Is HDPE FDA approved for food contact?
Natural (white/off-white) HDPE is compliant with FDA 21 CFR 177.1520 for food contact. This makes it the standard material for cutting boards, food processing wear strips, and food plant equipment components. UV-stabilized black HDPE is not FDA compliant due to the carbon black additive — do not use for food contact applications. For commercial food processing equipment, NSF 51 certification is typically required in addition to FDA compliance.
What is the difference between HDPE and UHMWPE?
UHMWPE (Ultra-High Molecular Weight PE) has a molecular weight of 3–6 million g/mol compared to 50,000–300,000 g/mol for standard HDPE. This much higher molecular weight gives UHMWPE dramatically better wear resistance (10× better abrasion resistance), higher impact strength, and lower coefficient of friction. The tradeoffs: UHMWPE is more expensive, harder to machine (tends to smear), and is slightly less stiff than HDPE. Choose HDPE for structural parts, tanks, and general machining. Choose UHMWPE for conveyor wear strips, chain guides, and any application where abrasion resistance is the primary concern.
How do I calculate HDPE pipe weight?
HDPE pipe weight = π × ((OD/2)² − (ID/2)²) × Length (mm) ÷ 1000 × Density (g/cm³). For a standard 4-inch IPS HDPE pipe (OD = 114.3 mm) with 10 mm wall thickness (ID = 94.3 mm), 1000 mm long, at 0.955 g/cm³: π × (57.15² − 47.15²) × 1000 ÷ 1000 × 0.955 ≈ 3,128 g per meter (3.13 kg/m). Select Tube shape above and enter OD, ID, and length for instant results on any HDPE pipe or tube size.