2026-09-21 · KeXinMaterials 编辑团队
防水箱 IP67 vs IP68 深度对比:B2B 海上 / 户外 / 水下采购指南 (2026)
IP67 和 IP68 不可互换。IP67 覆盖 90% 的 B2B 防水需求。IP68 仅用于水下或持续压力。这是 2026 详细 B2B 买家指南。
为什么防水箱是特殊 B2B 类别
Waterproof cases serve marine, offshore, subsea, and outdoor industrial applications where case failure means equipment loss + operational delay.
Marine deck operations: spray, splash, brief rain exposure. IP65 typically sufficient.
Offshore oil and gas: saltwater spray, weather deck, helicopter cargo. IP67 minimum.
Subsea ROV and diving: continuous water pressure, depth rating. IP68 required.
For B2B buyers, the cost differential between IP65, IP67, and IP68 (typically 5-10% per tier) does not reflect the operational risk differential. Selecting the wrong IP rating risks equipment loss + safety hazard.
IP65、IP67、IP68:每个的含义
IP ratings are defined by IEC 60529. Each digit has specific meaning. B2B buyers should select by deployment, not by maximum spec.
IP65: dust-tight + low-pressure water jets (12.5mm nozzle, 30 kPa). Sufficient for outdoor / weather deck / construction / workshop.
IP67: dust-tight + temporary immersion in 1 metre of water for 30 minutes. Required for offshore deck, marine deck survey, helicopter cargo.
IP68: dust-tight + continuous immersion at 1-3 metres depth for 30+ minutes. Depth specified by manufacturer. Required for subsea ROV, marine research, diving equipment.
IP rating cost differential: IP65 baseline. IP67 +5-10%. IP68 +25-40% (additional sealing, pressure testing, valve).
O 圈材料与设计
The O-ring is what seals the case. Material choice depends on deployment.
Silicone O-ring: temperature range -60°C to +200°C. Excellent UV and ozone resistance. Standard for MIL-PRF-GRF tactical cases. Slightly higher cost.
Nitrile (NBR) O-ring: temperature range -40°C to +120°C. Good oil and chemical resistance. Standard for commercial IP67 cases. Cost-effective.
EPDM O-ring: temperature range -50°C to +150°C. Excellent weather and chemical resistance. Used for outdoor / marine applications.
Viton (FKM) O-ring: temperature range -20°C to +200°C. Excellent chemical and high-temperature resistance. Premium for harsh chemical environments.
O-ring compression: 20-30% compression for proper seal. Over-compression damages O-ring. Under-compression allows water ingress.
O-ring groove design: rectangular cross-section, machined or moulded into case. Groove width 1.2-1.5x O-ring cross-section.
压力平衡阀
Pressure-equalisation valve is critical for altitude-change operations. It allows air pressure to equalise between case interior and atmosphere.
Applications: helicopter cargo, mountain operations, aircraft cargo holds, ROV launch / recovery.
Without pressure valve: case may pop open on descent (high to low altitude) or become impossible to open on ascent (low to high altitude).
Automatic valve: Gore-Tex membrane allows air to flow slowly without water ingress. Standard on our IP67 cases.
Manual valve: twist-to-open allows user to equalise pressure before opening. Used for subsea ROV launch where moisture control is critical.
For B2B buyers operating across multiple altitudes (helicopter + ground + shipboard), pressure-equalisation valve is non-optional.
防水箱的材料选择
PP copolymer is the workhorse for IP67 / IP68 cases. Glass-filled PP for premium stiffness. PA blends for extreme temperature.
PP copolymer: standard for IP65, IP67, IP68 cases. Good impact resistance, low cost. Wall thickness 3-5mm.
Glass-filled PP (10-30% glass): premium stiffness for IP68 cases. Required for MIL-PRF-GRF load test. Wall thickness 4-6mm.
PA (Nylon) blends: extreme temperature range (-40°C to +80°C). Used for subsea and aerospace applications. Cost USD 4-6/kg.
At KeXinMaterials we run PP copolymer standard for IP65/IP67, glass-filled PP for IP68 + MIL-PRF-GRF cases, PA blends on request for subsea SKUs.
特定应用设计
Waterproof case design varies by application. Match design to deployment.
Marine deck case: 500x350x200mm IP65/IP67. Foam cutouts for surveying equipment, electronics. Salt-spray tested. EPDM O-ring standard.
Offshore oil and gas case: 600x450x250mm IP67. Foam cutouts for instrumentation, cables. Saltwater corrosion-resistant hardware. Pressure-equalisation valve.
ROV launch case: 700x500x300mm IP68. Foam cutouts for ROV tether, manipulator spares, lights. Manual pressure-equalisation valve. Subsea-rated O-ring (Viton or EPDM).
Diving equipment case: 500x400x250mm IP68 100m rated. Foam for regulators, dive computers, accessories. Heavy-duty O-ring. Optional camera port.
Outdoor expedition case: 600x400x250mm IP67 with IP68 upgrade option. Foam for camping, photography, electronics. Pressure-equalisation valve. EPDM O-ring.
起订量与定价
Waterproof cases fall into three pricing tiers.
Tier 1 stock waterproof: 50-100 cases, USD 95-180/unit, 7-15 days production. IP65/IP67 standard.
Tier 2 custom OEM waterproof: 100-300 cases, USD 130-280/unit (case + foam + valve), 7-15 days production.
Tier 3 new mould waterproof: 1,000+ cases amortised, USD 90-220/unit post-amortisation, 60-90 days mould + 30-45 days production. IP68 deep rated.
为什么选择 KeXinMaterials 防水箱
KeXinMaterials operates 60+ injection machines in a 13,000 m² facility since 2014. PP, glass-filled PP, PA blends available. IP65/IP67/IP68 standard range.
Stock waterproof SKUs: 6 sizes from 350x250x150mm to 800x600x350mm. 50-piece MOQ for stock.
Material: PP copolymer (workhorse), glass-filled PP (IP68 premium), PA blends (subsea). O-rings: nitrile standard, EPDM / silicone / Viton on request.
Pressure-equalisation valve: automatic Gore-Tex standard on IP67 cases. Manual valve on request for IP68 subsea.
Certifications: IP65/IP67/IP68 batch test per SKU, MIL-STD-810G drop test per lot, CE / RoHS / REACH for EU export, FDA compatibility statement on request for medical SKUs.
Trade terms: EXW Shenzhen / FOB Shenzhen / FOB Ningbo. No DDP, no EU warehouse, no US warehouse. Every shipment direct from our 13,000 m² Guangdong facility.
核心要点
- IP65 = 低压水柱 / IP67 = 临时浸没 / IP68 = 持续浸没
- O 圈材料:硅胶 / 丁腈 / EPDM / Viton 按部署
- 压力平衡阀对海拔变化作业至关重要
- PP 共聚物标准 / IP68 用玻纤增强 PP / 水下用 PA 混合
- 海事甲板 / 海上 / ROV / 潜水 / 户外 — 设计因应用而异
常见问题
IP65、IP67 和 IP68 有什么区别?
IP65:防尘 + 低压水柱(12.5mm 喷嘴,30 kPa)。足够户外/天气甲板/建筑/车间。IP67:防尘 + 浸没 1 米水深 30 分钟。海上甲板、海事甲板测量、直升机货舱必需。IP68:防尘 + 连续浸没 1-3 米水深 30+ 分钟(深度由厂家指定)。水下 ROV、海洋研究、潜水必需。成本差:IP65 基准。IP67 +5-10%。IP68 +25-40%。
我应该选什么 O 圈材料?
硅胶:温度范围 -60°C 至 +200°C,优异 UV 和臭氧耐性。MIL-PRF-GRF 战术箱标准。丁腈(NBR):温度范围 -40°C 至 +120°C,良好耐油和耐化学性。商用 IP67 箱标准。EPDM:温度范围 -50°C 至 +150°C,优异耐候和耐化学性。户外/海事用。Viton(FKM):温度范围 -20°C 至 +200°C,优异耐化学和高温。严苛化学环境的高级选择。O 圈压缩:20-30% 适当密封。
何时需要压力平衡阀?
始终用于海拔变化作业:直升机货舱(快速压力变化)、山地作业(运输中海拔变化)、飞机货舱(飞行中快速加压变化)、ROV 发射/回收(水面至水下转换)。无压力阀:下降时箱可能弹开(高至低海拔)或上升时无法打开(低至高海拔)。自动阀(Gore-Tex 膜)IP67 箱标准。手动阀用于水下 ROV 发射。
防水箱什么材料最好?
PP 共聚物:IP65/IP67 箱标准。良好抗冲击,低成本。壁厚 3-5mm。玻纤增强 PP(10-30% 玻璃):IP68 箱高级刚度。MIL-PRF-GRF 承重测试必需。壁厚 4-6mm。PA(尼龙)混合:极温度范围(-40°C 至 +80°C)。用于水下和航空航天。成本 USD 4-6/kg。
防水箱的起订量是多少?
Tier 1 现货防水:50-100 箱,USD 95-180/箱,7-15 天生产。IP65/IP67 标准。Tier 2 定制 OEM 防水:100-300 箱,USD 130-280/箱(箱 + 泡沫 + 阀),7-15 天生产。Tier 3 新模具防水:1,000+ 箱 12-24 个月分摊,USD 90-220/箱 分摊后,60-90 天模具 + 30-45 天生产。IP68 深度等级。
如何验证防水箱防护等级?
4 步验证:(1)要求每批次特定测试证书(非工厂层面)。(2)验证测试参数:IP67 = 浸没 1m / 30 min。IP68 = 浸没深度 + 时长。(3)验证 O 圈材料是否匹配部署(硅胶/丁腈/EPDM/Viton)。(4)交叉核对证书上的批号与实际发货批号。采购陷阱:工厂有 2020 IP67 证书。如果模具设计、O 圈材料或供应商改变,证书不再适用。