Materials
Resin Weight Calculator
Calculate resin mass from volume, density, and cavities.
Injection molding support
Material calculations, starting with density and resin use
Use grade-specific material data for part mass and costing. This focused hub supports the injection molding workflow; it is not a generic material-property database.
Start here
Weight and resin cost
Costing
Material Cost Per Part Calculator
Estimate resin material cost per molded part.
Reference density: verify the exact grade
Density is suitable for converting a finished part’s measured or CAD volume to mass. The figures below are manufacturer-published solid-density references, not melt-density values for barrel/shot-volume calculations.
| Material grade | Density | Basis |
|---|---|---|
| Ultramid B3S Q661 (PA6) | 1.13 g/cm³ | ISO 1183; BASF product data |
| Ultradur B 4300 G6 HR (PBT-GF30) | 1.51 g/cm³ | ISO 1183; BASF product data, typical uncoloured value at 23°C |
Fillers, moisture, colour, temperature, and grade can change density. Enter the value from the exact material data sheet or a validated part measurement. Do not copy these solid-density figures into the Shot Volume Calculator, which asks for melt density.
BASF Ultramid B3S Q661 data · BASF Ultradur B 4300 G6 HR data
Data selection workflow
Choose a material property by the calculation, state, and decision.
Record the exact grade, condition, test basis, and temperature context before moving a value between a part, a barrel, a mold, or a cost model. The limited density examples above are solid-state examples, not a general property database.
| Property | Source and condition to record | Used by | Do not substitute it for |
|---|---|---|---|
| Solid density | Exact-grade data sheet or repeatable molded-part measurement; note filled grade and dry/conditioned state. | Resin Weight for finished-part mass from volume. | Melt density in Shot Volume. |
| Melt density | Supplier processing data or a documented process-specific basis; retain resin and melt-temperature context. | Shot Volume when comparing complete shot mass with injection-unit volume. | A universal conversion from a PS shot-weight rating. |
| Linear shrinkage | Exact grade, filler level, flow direction, processing basis, and molded dimension; trials remain the validation source. | Mold Shrinkage for a nominal cavity allowance. | One isotropic rule for an orientation-sensitive part. |
| Thermal diffusivity | Grade-relevant technical data with a stated temperature basis; identify the controlling wall and ejection criterion. | Cooling Time for a first flat-wall comparison. | Cooling-channel design or a production setting without trials. |
| Purchase mass and price | Current purchasing record, weighed part and runner mass, cavity allocation, and explicit recovery or scrap policy. | Material Cost Per Part. | A finished part quotation or total conversion cost. |
For a new grade, retrieve the supplier data sheet first and retain the record with the calculation. The cited BASF grade rows above illustrate the required level of specificity; they are not defaults for another resin family.
Calculate resin weight · Calculate shot volume · Estimate material cost
Material planning tools
Use grade-specific data in a documented blend and purchase workflow
Regrind Blend Calculator
Convert an approved blend percentage into virgin and regrind mass.
Masterbatch Dosage & Let-Down Ratio Calculator
Build an explicit total-blend, base-resin-addition, or active-content recipe and report both ratio conventions.
Resin Purchase Quantity Calculator
Plan virgin material and package count from documented mass and loss assumptions.
Resin datasheet guide
Choose a grade, condition, test basis, and temperature context before calculating.
Carry exact solid density into extrusion line planning
Use the grade-specific solid density or a validated product mass-per-length record in the Extrusion Line Throughput Calculator. Do not substitute injection-unit melt-density assumptions.
Connect material identity to measured film performance
Carry the exact grade, lot, thickness, orientation, conditioning, and specimen preparation into the Film & Flexible Packaging Test Calculators. Do not compare reduced values without the full test basis.