Shot Weight & Barrel Check — HDPE
Shot mass and barrel-capacity utilization for HDPE (density 0.95 g/cm³).
The 2% shrink number is direction-dependent: HDPE shrinks more along flow than across it, and crates/closures warp exactly along that anisotropy.
Formula
Note: Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Shot mass and barrel-capacity utilization for HDPE (density 0.95 g/cm³). A free injection molding cycle & process tool — no sign-up, no upload, instant results in your browser.
About Shot Weight & Barrel Check — HDPE
Shot Weight & Barrel Check — HDPE computes the governing relationship shot = V × ρ_melt; utilization vs PS-adjusted barrel rating (keep 20–80%) live as you type. The 2% shrink number is direction-dependent: HDPE shrinks more along flow than across it, and crates/closures warp exactly along that anisotropy. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Shot Weight & Barrel Check — HDPE
- 1Enter your values — Part volume, Cavities, Runner volume, Melt density and more (sensible defaults are pre-filled).
- 2Read the live results: Shot weight, Barrel utilization.
- 3Check the "with your numbers" line to see shot = V × ρ_melt; utilization vs PS-adjusted barrel rating (keep 20–80%) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Shot Weight & Barrel Check — HDPE?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula shot = V × ρ_melt; utilization vs PS-adjusted barrel rating (keep 20–80%) with authoritative sources cited on the page (Rosato, Injection Molding Handbook, 3rd ed.; Resin supplier processing data sheets (per-grade values govern))
- ✓The 2% shrink number is direction-dependent: HDPE shrinks more along flow than across it, and crates/closures warp exactly along that anisotropy.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the shot weight & barrel check — hdpe use?+
It evaluates shot = V × ρ_melt; utilization vs PS-adjusted barrel rating (keep 20–80%), exactly as published. Sources: Rosato, Injection Molding Handbook, 3rd ed.; Resin supplier processing data sheets (per-grade values govern). The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
The 2% shrink number is direction-dependent: HDPE shrinks more along flow than across it, and crates/closures warp exactly along that anisotropy. Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
When is this calculator the right tool for the job?+
Shot mass and barrel-capacity utilization for HDPE (density 0.95 g/cm³). A free injection molding cycle & process tool. The 2% shrink number is direction-dependent: HDPE shrinks more along flow than across it, and crates/closures warp exactly along that anisotropy. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
Related tools
- Shot Weight & Barrel Check — ABS
- Shot Weight & Barrel Check — Polycarbonate (PC)
- Shot Weight & Barrel Check — Nylon 66 (PA66)
- Shot Weight & Barrel Check — Polystyrene (GPPS)
- Shot Weight & Barrel Check — Acetal (POM)
- Shot Weight & Barrel Check — PET (Preform Grade)
- Shot Weight & Barrel Check — TPU (Shore 85A)
- O-Ring Groove Calculator (Gland Design)
- Cost per Part — 5-Axis Machining Center
Related Manufacturing tools
Spindle Speed Calculator — Aluminum 6061
Carbide starting RPM for milling Aluminum 6061: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● LiveSpindle Speed Calculator — Mild Steel 1018
Carbide starting RPM for milling Mild Steel 1018: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● LiveSpindle Speed Calculator — Stainless 304
Carbide starting RPM for milling Stainless 304: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● Live