2026-09-21 · Equipo editorial KeXinMaterials
Interior de Espuma: Pick-and-Pluck vs CNC Ruteado vs EVA — Comparación B2B 2026
El interior de espuma es la personalización de mayor impacto para cajas de protección B2B. La espuma PE Pick-and-Pluck es la más barata pero imprecisa; la espuma PU CNC ruteada es precisa pero lenta; la espuma EVA es intermedia.
3 tipos de espuma de un vistazo
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).
Espuma PE Pick-and-Pluck en detalle
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.
Espuma PU ruteada CNC en detalle
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.
Espuma EVA en detalle
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.
Matriz de comparación de 5 criterios
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.
Espumas antiestáticas + ESD (variantes especiales)
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.
Recomendación de adquisición B2B
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.
Capacidad de espuma KeXinMaterials
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.
Puntos clave
- Espuma PE Pick-and-Pluck: USD 5-15/caja, 0 días plazo, prototipado / bajo volumen
- Espuma PU CNC ruteada: USD 50-200/caja, 7-15 días, precisión / alto valor / marca
- Espuma EVA: USD 20-50/caja, 7-15 días, cajas de herramientas / cámara gama media
- Espuma antiestática AS: USD 5-15/caja prima, cumplimiento ANSI/ESD S541
- Espuma conductiva: USD 20-50/caja prima, entornos explosivos ATEX/IECEx
Preguntas frecuentes
¿Qué tipo de espuma es mejor para un pedido de 1000 cajas de cámara?
Para 1000+ cajas de cámara, la espuma PU CNC ruteada es la mejor opción. Aunque el costo por caja es USD 50-200, el tooling único (USD 300-2000 por SKU) se distribuye en 1000+ unidades.
¿Cuál es la diferencia entre espuma PE y espuma PU?
Espuma PE (polietileno): densidad 30-33 kg/m³, más barata, más rígida. Espuma PU (poliuretano): densidad 50-80 kg/m³, más cara, más absorbente de impactos.
¿La espuma antiestática puede prevenir daños ESD?
Sí. La espuma antiestática (AS) tiene resistividad superficial de 10^9-10^11 Ω que previene acumulación estática. La espuma conductiva tiene 10^3-10^5 Ω que disipa activamente la carga estática.
¿La espuma Pick-and-Pluck es adecuada para equipos médicos?
No. La espuma PE Pick-and-Pluck no es adecuada para equipos médicos: (1) ajuste impreciso. (2) estructura de células abiertas puede albergar bacterias. (3) patrón de cuadrícula visible no se puede limpiar en hospital.
¿Cuánto dura el tooling de espuma PU CNC?
El tooling de espuma PU CNC (archivo CAD + G-code) dura típicamente toda la vida del SKU. Almacenamiento como archivo digital.
¿Cuál es el MOQ para insertos de espuma CNC personalizados?
El MOQ para insertos de espuma PU CNC personalizados varía: fábricas pequeñas 10-50 cajas, medianas 50-100 cajas, grandes 100-500 cajas. En KeXinMaterials: MOQ espuma PU CNC 50 cajas.