2026-09-21 · KeXinMaterials 编辑团队
防护箱泡沫内胆:Pick-and-Pluck vs CNC 切割 vs EVA B2B 对比 2026
泡沫内胆是 B2B 防护箱最高 ROI 的定制。Pick-and-Pluck PE 泡沫最便宜但不够精确;CNC 切割 PU 泡沫精确但慢;EVA 泡沫居中。2026 B2B 采购对比。
三种泡沫类型一览
Pick-and-pluck PE foam, CNC routed PU foam, and EVA foam cover 95% of B2B case interior demand. Each fits different use cases: pick-and-pluck for prototyping, CNC for precision, EVA for production.
Pick-and-pluck foam (PE — polyethylene): pre-cut 1cm x 1cm grid. Buyer manually plucks cubes to fit shape. Cost USD 5-15 per case (cheap). Lead time 0 days (stock). Limitation: imprecise fit, cubes fall out over time.
CNC routed foam (PU — polyurethane, sometimes PE): CAD-designed, machine-cut to exact geometry. Cost USD 50-200 per case (mid-high). Lead time 7-15 days (custom). High: precision fit, repeatable, presentable.
EVA foam (ethylene-vinyl acetate): die-cut or heat-formed. Cost USD 20-50 per case (mid). Lead time 7-15 days. Mid: presentable + decent precision + cheaper than CNC PU. Common in tool cases.
For B2B procurement, choose based on: equipment value (high → CNC), order volume (low → pick-and-pluck), presentation (high → EVA or CNC), budget (low → pick-and-pluck).
Pick-and-Pluck PE 泡沫深入解析
Pick-and-pluck is the cheapest and fastest foam option. Best for low-volume prototyping and basic protection.
Material: polyethylene (PE) foam, density 30-33 kg/m³. Pre-cut grid pattern with 1cm cubes. Buyer plucks cubes by hand to fit equipment shape. Available in 4-6 colors.
Cost: USD 5-15 per case (lowest). Stock foams ship same-day; custom foam only needs plucking step.
Lead time: 0 days (if stock foam) or 1-3 days (custom plucking). Fastest option.
Protection: medium. PE foam 30-33 kg/m³ density provides shock absorption for typical 25G impact. Less protective than CNC PU foam 50-80 kg/m³.
Presentation: low. Visible 1cm grid pattern. Equipment does not fit perfectly. Industrial use, not for camera/medical equipment.
Best for: prototyping (before CNC tooling), low-volume orders (under 50 cases), basic industrial protection, replacement foam.
CNC 切割 PU 泡沫深入解析
CNC routed polyurethane foam is the premium choice for B2B precision protection. Used by Pelican, military, medical, drone industries.
Material: polyurethane (PU) foam, density 50-80 kg/m³ (anti-static available). CAD → G-code → CNC hotwire or mill. Custom cavity geometry for each equipment item.
Cost: USD 50-200 per case (highest). Custom design adds USD 300-2000 one-time tooling per SKU. Multi-cavity foam for camera/drone/medical equipment fits precisely.
Lead time: 7-15 days (custom). Faster on repeat orders (existing CAD).
Protection: highest. PU foam 50-80 kg/m³ density absorbs 50G+ impact. Anti-static (ESD) variants for electronics. Conductive variants for explosive environments.
Presentation: highest. Smooth cavity walls, custom labels (laser-etched), professional appearance. Standard for camera/broadcast/medical/military.
Best for: precision equipment (camera, drone, medical, military), high-value payload (>USD 10,000), repeated orders (>100 cases), professional B2B brands.
EVA 泡沫深入解析
EVA foam is the mid-range option. Heat-formed or die-cut. Common in tool cases, consumer electronics, mid-range camera cases.
Material: ethylene-vinyl acetate (EVA) foam, density 30-50 kg/m³. Available in laminated sheets (multiple densities), die-cut shapes, or heat-formed 3D shapes.
Cost: USD 20-50 per case (mid). Lower than CNC PU foam. Higher than pick-and-pluck PE foam.
Lead time: 7-15 days (die-cut). 10-20 days (heat-formed 3D).
Protection: medium-high. EVA foam 30-50 kg/m³ is denser than PE foam but less dense than CNC PU foam. Good for tools and consumer electronics.
Presentation: medium-high. Smooth surfaces, presentable colors, brand-able. Common in tool cases (Stanley, DeWalt, Bosch).
Best for: tool cases, consumer electronics, mid-range camera cases, OEM brands wanting good presentation without CNC premium.
5 准则对比矩阵
Score each criterion 1-3 across the three foam types. Highest total wins. Score 1 = poor fit, 2 = acceptable, 3 = excellent fit.
Criterion 1 — Equipment value: under USD 1,000 = pick-and-pluck OK. USD 1,000-10,000 = EVA or CNC PU. USD 10,000+ = CNC PU.
Criterion 2 — Order volume: under 50 cases = pick-and-pluck. 50-500 = EVA. 500+ = CNC PU (amortised tooling).
Criterion 3 — Presentation need: industrial only = pick-and-pluck. Tool/consumer = EVA. Camera/medical/military = CNC PU.
Criterion 4 — Lead time: same-day = pick-and-pluck. 7-15 days = EVA or CNC PU. 15+ days = CNC PU (full custom).
Criterion 5 — Budget: under USD 10/case = pick-and-pluck. USD 10-50 = EVA. USD 50-200 = CNC PU.
防静电 + ESD 泡沫(特殊变体)
For electronics, semiconductor, and explosive environments, anti-static (AS) and conductive foam are required. Available in PU and PE variants.
Anti-static (AS) foam: surface resistivity 10^9-10^11 Ω. Prevents static buildup. Standard for electronics packaging. Available in PU and PE. Adds USD 5-15 per case.
Conductive foam: surface resistivity 10^3-10^5 Ω. Full ESD protection. Required for explosive environments (ATEX zones). Available in PU foam + carbon black. Adds USD 20-50 per case.
Compliance: ANSI/ESD S541 (Packaging Materials for ESD Sensitive Items). IEC 61340-5-1 (ESD protection). Required for semiconductor, electronics, explosive environments.
For B2B buyers: specify AS foam for general electronics. Specify conductive foam for ATEX/IECEx explosive environments. Specify CNC PU AS foam for high-value electronics.
B2B 采购建议
Below is the typical 2026 B2B foam recommendation by use case.
Drone case (1-5 kg payload, USD 1,000-10,000 drone): CNC PU foam with custom cavity for drone body + remote controller + batteries + accessories. Anti-static variant if drone is for electronics / PCB testing.
Camera / photography (USD 5,000-50,000 gear): CNC PU foam with custom cavity for each lens / body / accessory. Laser-etched labels for professional presentation.
Tool case (industrial / automotive): EVA foam die-cut. Laminated 30-50 kg/m³ density. Mid-range cost + good presentation. Common in Stanley, DeWalt, Bosch tool cases.
Medical device case (USD 5,000-50,000): CNC PU foam with cleanable surface (closed-cell PU). Anti-microbial additive on request. Smooth surfaces for hospital cleaning.
Military / tactical (USD 1,000-50,000): CNC PU foam MIL-spec. Black, anti-static, with Velcro / strap systems for accessory retention. Often multiple foam layers.
KeXinMaterials 泡沫能力
KeXinMaterials offers all 3 foam types + custom design + anti-static + conductive + MIL-spec. EXW Shenzhen / FOB Shenzhen / FOB Ningbo only.
Pick-and-pluck PE foam: stock in 30/33 kg/m³ density. 4 colors. Same-day ship from Shenzhen.
CNC routed PU foam: 50/60/70/80 kg/m³ density. Anti-static + conductive + closed-cell variants. CAD design free or USD file accepted.
EVA foam: 30-50 kg/m³ density. Die-cut or heat-formed. Multi-layer lamination for hard + soft layered foam.
MOQ: pick-and-pluck 10 cases. CNC PU 50 cases. EVA die-cut 100 cases.
Lead time: pick-and-pluck 0-3 days. CNC PU 7-15 days (custom). EVA die-cut 7-15 days.
核心要点
- Pick-and-Pluck PE 泡沫:USD 5-15/箱,0 天交期,原型 / 小批量
- CNC 切割 PU 泡沫:USD 50-200/箱,7-15 天,精确 / 高价值 / 品牌
- EVA 泡沫:USD 20-50/箱,7-15 天,工具箱 / 中端相机
- 防静电 AS 泡沫:USD 5-15/箱 加价,ANSI/ESD S541 合规
- 导电泡沫:USD 20-50/箱 加价,ATEX/IECEx 防爆环境
常见问题
1000 件相机箱订单,哪种泡沫类型最好?
1000+ 件相机箱首选 CNC 切割 PU 泡沫。虽然单箱成本 USD 50-200,但一次性模具(USD 300-2000/SKU)分摊到 1000+ 件,单件成本有竞争力。CNC PU 泡沫提供精确配合 + 专业外观,适合相机装备(典型 USD 5,000-50,000)。
PE 泡沫和 PU 泡沫的区别是什么?
PE 泡沫(聚乙烯):密度 30-33 kg/m³,更便宜、更硬。PU 泡沫(聚氨酯):密度 50-80 kg/m³,更贵、吸震更好。PE 泡沫通常 Pick-and-Pluck。PU 泡沫通常 CNC 切割。B2B 精确应用首选 PU 泡沫。
防静电泡沫能防止 ESD 损坏吗?
可以。防静电(AS)泡沫表面电阻率 10^9-10^11 Ω,防止静电积聚。导电泡沫 10^3-10^5 Ω,主动消散静电。ANSI/ESD S541 标准用于包装 ESD 敏感物品。
Pick-and-Pluck 泡沫适合医疗设备吗?
不适合。Pick-and-pluck PE 泡沫不适合医疗设备,原因:(1) 配合不精确允许运输中移动。(2) 开孔结构可能藏细菌。(3) 可见网格图案无法医院清洁。医疗设备首选 CNC 切割 PU 泡沫 + 闭孔表面 + 抗菌添加剂。
CNC PU 泡沫模具寿命多长?
CNC PU 泡沫模具(CAD 文件 + G-code)通常持续整个 SKU 寿命。作为数字文件存储。后续订单只产生加工时间 + 泡沫材料成本。
定制 CNC 泡沫插件的起订量是多少?
定制 CNC PU 泡沫插件 MOQ 因工厂而异:小厂 10-50 箱,中厂 50-100 箱,大厂 100-500 箱。KeXinMaterials CNC PU 泡沫 MOQ 50 箱。Pick-and-Pluck PE 泡沫 MOQ 10 箱(无需模具)。