# KeXinn Knowledge Base

> Engineering reference for protective and transport case buyers, published by KeXin Materials (Guangdong) Co., Ltd.. Standards-based guides on IP ratings, case materials, foam, drop testing, hardware, temperature/UV, shipping terms and OEM timelines.

## Guides

- [What Do IP Ratings Actually Mean for Protective Cases?](https://kexinn.org/ip-ratings-explained/): What IP65, IP67 and IP68 are actually tested against — and which one you need.
- [PP vs ABS vs Rotomolded PE vs Aluminum: Case Materials Compared](https://kexinn.org/case-materials-compared/): Weight, impact, temperature and cost trade-offs between the four mainstream shell materials.
- [Foam Inserts for Protective Cases: EPE vs EVA vs PU vs CNC-Cut](https://kexinn.org/foam-insert-guide/): Pick the right interior foam: cushioning, presentation, or field-configurable.
- [How to Choose the Right Protective Case Size](https://kexinn.org/how-to-size-a-protective-case/): Internal volume, foam allowance, wheels and the 62-inch airline rule.
- [Drop and Impact Standards for Protective Cases: MIL-STD-810, ATA 300 and ISTA](https://kexinn.org/drop-and-impact-standards/): How to read drop-test claims: which standard, which procedure, what height.
- [Why Watertight Cases Need a Pressure Relief Valve](https://kexinn.org/pressure-relief-valves/): Altitude and temperature lock latches and stress gaskets — the valve fixes both.
- [Case Gaskets, Latches and Hinges: The Hardware That Decides Lifespan](https://kexinn.org/gaskets-latches-and-hinges/): Shell plastics get the glory; gaskets and latches decide whether it still seals in year five.
- [Protective Cases in Heat, Cold and Sunlight: Temperature and UV Performance](https://kexinn.org/temperature-and-uv-performance/): What −40 °C to +90 °C really means on a datasheet, and why black cases outlast bright ones outdoors.
- [EXW vs FOB: Shipping Terms for Protective Case Buyers](https://kexinn.org/exw-vs-fob-for-case-buyers/): Who books what, who pays for what, and where risk changes hands.
- [Custom OEM Protective Cases: Realistic Timeline From RFQ to Shipment](https://kexinn.org/custom-oem-case-timeline/): 45 days with an existing mold, roughly 125 days when new tooling is required — here is where the time goes.
- [Flying with Equipment Cases: Airline Rules, ATA 300 and Transit Prep](https://kexinn.org/airline-travel-with-equipment-cases/): The 62-inch rule, battery fine print, and why your case arrived with a bulging lid.
- [Branding a Protective Case: Pad Printing vs Laser vs In-Mold Labeling](https://kexinn.org/case-branding-options/): Which logo process survives abrasion, UV and solvent — and what each costs in setup.
- [Why Custom Cases Have a Minimum Order Quantity (and What Drives It)](https://kexinn.org/oem-case-moq-explained/): What actually sets the MOQ floor: color batches, foam setups and press time.
- [Injection Molding vs Rotomolding for Custom Cases: Tooling Economics](https://kexinn.org/injection-vs-rotomolding-tooling/): Steel tooling vs cast tooling: where each process pays off by volume and duty.
- [How to Write an RFQ for Custom Protective Cases (Buyer Checklist)](https://kexinn.org/how-to-write-case-rfq/): The 12 fields that make suppliers quote accurately instead of guessing.
- [Pre-Shipment Inspection for Protective Cases: What to Check and AQL Basics](https://kexinn.org/case-pre-shipment-inspection/): AQL sampling, the 8-point functional check, and when third-party inspection pays for itself.
- [Export Packing for Protective Cases: Master Cartons, Pallets and Container Loading](https://kexinn.org/export-packing-and-container-loading/): From single case to sealed container: carton strategy, pallet patterns and cbm math.
- [EMI and RFI Shielding Cases: When Plastic Is Not Enough](https://kexinn.org/emi-rfi-shielding-cases/): Aluminum shells, conductive coatings and EMI gaskets — the three paths to shielding.
- [Moisture and Corrosion Control Inside Protective Cases](https://kexinn.org/moisture-and-corrosion-control-in-cases/): A sealed case is also a humidity box — desiccants, indicator cards and VCI done right.
- [Which Case for Which Job: Selection by Industry and Use](https://kexinn.org/case-selection-by-industry/): The same shell serves many trades; the interior, sealing class and wheels change.
- [Recyclability of Protective Cases: PP, PE and Designing for End of Life](https://kexinn.org/case-recyclability-and-sustainability/): Mono-material shells are widely recyclable; the foam and mixed hardware are the challenge.

## Contact

OEM and volume inquiries: KeXin Materials — https://www.kexinmaterials.com (B2B only, EXW/FOB).