Fiber Optic Splice Closure Manufacturer

Closure Families: Specs, MOQ and Lead Time

Every closure family this fiber optic splice closure manufacturer molds and tests is listed below with MOQ and lead time. Lead time runs from deposit and includes the air-pressure seal test on 100% of units.

Family	Options	Capacity	MOQ	Lead time
Dome closure (vertical)	Multi-port entries, gland or heat-shrink seals	24-48+ cores	200 pcs	6-9 days
Horizontal inline closure	Three-tier tray stack, 2-4 cable entries	24-48 cores	200 pcs	6-9 days
Aerial junction box	1x8 splitter space, steel-tube splitter ready	24 cores + splitter	200 pcs	6-9 days
Underground PPR box	PPR body, 4-port, handhole rated	Small joints	200 pcs	6-9 days
FTTA cassette enclosure	Cassette style, splitter + splices, 6-core entries	6-24 cores	200 pcs	6-10 days
LGX splitter housing	Waterproof 1x8 LGX mount, SC/APC ports	Splitter + 8 drops	200 pcs	6-9 days

MOQ and lead-time figures are standard production windows; Chinese New Year peaks can add 5-7 days. Fixed delivery dates are confirmed in writing on the proforma invoice.

What buyers order most from this shelf

• 48-core dome closure: trunk routes and feeder joints - the highest-count seal on the shelf.
• Horizontal three-tier 24-core: distribution runs with two to four cable entries.
• Aerial 1x8 junction box: pole-mounted split points with the splitter sealed inside.
• Underground PPR 4-port: handhole and chamber terminations on buried routes.
• FTTA cassette enclosures: tower-base fiber runs for radio units.

These five cover most purchase orders. Port configurations, seal types and mounting brackets set per order - the grid above lists the current shells.

Dome or Horizontal? Choose by Route Shape

Both closures seal the same joints - the shape follows the route, and this fiber optic splice closure manufacturer builds both families on shared tray hardware:

	Dome (vertical)	Horizontal (inline)
Shape	Cable enters the base, dome lifts	Cable enters both ends, body splits
Capacity	Highest - stacked trays	24-48 cores across three tiers
Entries	4-8 ports around the base	2-4 ports, two ends
Best route	Trunk joints, branch points, pedestals	Straight distribution runs
Re-entry	Lift the dome - hands stay free	Open the clamshell in place

Mixed routes use both: a dome at the branch point, horizontals along the run. Because both families share the same splice tray system, trays and protectors stock as one spare set.

Anatomy of a Dome Closure: Seven Parts Between Water and Glass

Lift the dome and seven parts do the protecting. Buyers who know them read a closure like a spec sheet:

• Base: the molded floor with the entry ports - port seals size to your cable, one cable per port.
• Dome: the UV-stabilized PC shell that caps the stack; it lifts for re-entry and re-seals on the base gasket.
• Tray stack: 12-splice trays stacked on posts, each tray with its own slack storage loop.
• Entry seals: gland rings or heat-shrink tubes that close each port on the exact cable diameter.
• Fixing kit: the basket and clamps that hold the cable strength member - the fiber never takes route load.
• Grounding lug: bonds metal strength members to earth on cables that carry them.
• Gasket set: the dome-to-base seal, cut for re-entry - spares ship with every order.

Horizontal closures run the same seven parts laid inline, with the tray stack split across three tiers instead of one column.

Splice Tray Organization: Where 48 Splices Stay Calm

A 48-core closure holds four 12-splice trays stacked on posts. The organization rules that keep future crews friendly:

• One cable per tray: all splices from one cable land in the same tray, so a future cut-back opens one tray, not four.
• Slack per tray: 60 cm of excess fiber coils in the tray's own loop - re-work never pulls from a neighboring tray.
• Protectors seated flat: 45 mm heat-shrink protectors lie flat in the grooves; a standing protector lifts the stack and cracks a neighbor's lid.
• Route map in the lid: a laminate card maps tray to cable to port - the drawing lives with the hardware.

Stacked trays hold under a lid with clearance above the highest protector - the dome never touches glass, and neither does the crew's patience.

Sealing and Re-Entry: The Specs That Decide a 20-Year Closure

A closure fails in one place first - the seal. Four specs keep water out for two decades:

• IP68 sealing: dust-tight and submersible - our closures test under water at pressure equivalent to 1 meter (draft test condition - datasheets state the protocol).
• Re-entry gasket: the mechanical seal cuts for repeated opening; a maintenance splice costs a gasket, not a closure.
• Cable port seals: gland rings or heat-shrink seals close each entry on the exact cable diameter - an oversized port is a water door.
• Temperature band: -40°C to +65°C service, with the gasket compound rated for the same band.

Proof, not promises: every unit from this fiber optic splice closure manufacturer leaves the line through an air-pressure seal test - the housing pressurizes, and the pressure holds before the unit earns its box.

Three Seal Types: Gland, Heat-Shrink or Gel - Pick by Crew and Route

Port sealing is where closures get specified, and each seal type suits a different crew and route:

Seal type	How it works	Best for
Mechanical gland	A compression ring squeezes the port seal onto the cable - re-openable	Maintenance-heavy routes and re-entry plans
Heat-shrink	An adhesive tube shrinks onto cable and port - permanent bond	Buried routes opened once in a decade
Gel seal	A gel block wraps the cable - tool-free and reusable	Fast drop programs and mixed cable sizes

Mixed orders are normal: gland seals on the feeder entries, gel seals on the drop entries, in one closure. State the cable diameters per port in the RFQ and the quote lists the seal per port - this is the level of detail a fiber optic splice closure manufacturer should volunteer, not chase.

Plan the Spare Ports: Growth Costs Nothing at Order Time

Closures seal ports permanently once heat-shrink sleeves go on - so port count is a five-year decision made at order time. Three planning habits keep growth cheap:

• Count future joints, not present ones: a route that gains two branches a year wants the next capacity step up.
• Keep two gasketed spare ports minimum: blank plugs hold the seal until the new cable arrives.
• Prefer gland seals on the growth ports: gland rings re-open; heat-shrink does not.

Send the route plan with today's joints and the growth plan, and the quote states the capacity we would ship - spare plugs gasketed and bagged inside the dome.

Port Seal Configuration: Send Diameters, Get a Schedule

The RFQ that seals best asks one extra question: what cable diameter enters each port? Quote teams return a port schedule like this (illustrative):

Port	Cable	Seal
Entry 1	12.0 mm feeder	Heat-shrink, permanent
Entry 2	10.0 mm feeder	Heat-shrink, permanent
Entry 3	7.0 mm distribution	Gland ring, re-enterable
Entry 4	7.0 mm distribution	Gland ring, re-enterable
Entries 5-6	Reserved	Blank plugs, gasketed

Reserved ports ship with gasketed plugs, so a future cable enters through a factory seal instead of a field improvisation. The schedule prints into the order and packs in the box - the next crew inherits the plan, not a puzzle.

OEM, ODM and Private-Label Capability

As an OEM fiber optic splice closure manufacturer, we build to your port layout, marking and packaging spec:

• OEM: laser marks on the dome, private-label cartons and instruction cards - free artwork proofing above 500 pieces.
• ODM: custom port counts, tray stacks, splitter-ready interiors and bracket designs - samples in 10-15 days after drawing approval (draft).
• OBM / JDM: exclusive models and stocked programs for distributors under NDA, with seasonal price locks.

OEM projects we shipped (draft references - replace with your approved cases)

• Southeast Asian ISP, 2024: 9,000 dome closures across a rural feeder program, mixed gland and heat-shrink seals per route type.
• European utility contractor, 2023: 3,500 horizontal three-tier closures with private-label instruction cards, quarterly call-offs.
• African aerial FTTH program, 2025: 5,000 aerial 1x8 junction boxes with steel-tube splitters factory-fitted, pole brackets included.

Closures work beside the boxes that end the cable: see our termination boxes for the drop point and ODFs for the exchange.

Certifications and Compliance

The factory runs under ISO 9001:2015, with CE reports covering passive families sold into the EU, and the company holds a utility patent on a fiber optic quick connector - the in-house R&D behind our passive range. Documents are public on the certificate page.

Certificate	Relevance to closures
ISO 9001:2015	Quality management for molding, assembly and seal testing
OHSAS 18001:2007	Occupational health and safety management
CE reports	Passive families shipped into the EU
Utility model patent	Quick connector design - the factory's R&D depth

Materials run RoHS-compliant on request; shells are UV-stabilized PC rated for -40°C to +65°C service. RoHS certificates join the shipment file on request.

Factory Strength: Seals Proven on a Bench, Not a Promise

A closure is a pressure vessel with fiber inside, and this fiber optic splice closure manufacturer treats it like one. The Yiwu compound molds shells, cuts gaskets and runs the seal-test bench beside our cable and cord lines - 25 years under founder LING LI, since December 2000:

• Molding: in-house tools for domes, bases and trays - UV-stabilized PC, wall thickness to spec.
• Seal test: 100% of units pressurize and hold on the bench; a closure that bleeds air never ships.
• Quality: Grace Xu, Quality Director, owns the seal-test records and batch release.
• R&D: Zhou Liubo, Director of R&D and quick-connector patent holder, owns port layouts and splitter-ready interiors.
• Export: Peter Lin, Head of Export Sales - one contact from RFQ to B/L. Video audits run any business day - see the factory gallery.

Company quick facts
Founded	December 2000, Yiwu City, Zhejiang, China
Founder	LING LI, Founder & General Manager
Focus	Closures, termination boxes, splitters, connectors, adapters, cords, cable, ODFs
Export markets	40+ countries across Asia, the Middle East, Africa, Europe and the Americas
Response time	Quotes within 24 hours on business days

Four Closure Failures and the Detail That Prevents Each

Closures from careless fiber optic splice closure manufacturer lines fail in known ways. Each failure maps to a build detail on our line:

• Water inside after the first storm - a nicked dome gasket or a port sealed on the wrong cable size. Gasket grooves run to spec, and port seals size per port from your cable list.
• Crushed tray, broken splices - the dome was screwed down onto an over-stuffed stack. Our tray posts set the stack height; the dome never touches glass.
• Ground fault on a bonded cable - the grounding lug was skipped at install. Lug and bond ship standard on metal-member builds, with a marked bond point inside.
• Re-entry that leaks - a single-use seal re-used. Re-entry gaskets and spare sets ship in every box, so the second opening seals like the first.

Four failures, four details - all visible on the bench before shipment, which is why the air-pressure test record matters more than the product photo.

Documentation: The Paper Trail of a Sealed Joint

Acceptance teams audit paper as hard as they audit seals. Every closure order produces three documents:

• Seal test record: unit serial, test pressure, hold time and pass result - one line per closure, signed by the QC release.
• Tray map template: a blank tray-to-cable map sized to the closure model, so field crews file joint locations consistently.
• Material certificates: shell and gasket material statements for the tender file, on request.

Records keep for the warranty period and match the serial labels on the housings - the paper trail ends where the closure begins.

Regional Notes: Closures Ship Differently by Market

Twenty-five years of export taught this fiber optic splice closure manufacturer how routes and habits change the spec by region:

• Asia-Pacific: aerial domes with splitter-ready interiors lead - pole routes and high split density.
• Europe: horizontal inline closures with re-entry gland seals for maintenance-heavy utility routes.
• Middle East & Africa: heat-shrink seals and buried domes rated for heat, dust and handhole chambers.
• Americas: pedestal domes and FTTA enclosures for tower-base fiber runs.

Tell us the route type and the crew profile. We answer with the build that already ships there.

Why Buyers Pick HENGXANG Over Other Suppliers

Closure quality hides until the first flood. Compare on the specs that decide it:

Factor	HENGXANG	Typical trading company
Seal proof	100% air-pressure test, record per unit	No per-unit test
Re-entry	Gasket-cut mechanical seal, spares stocked	Single-use seals
Port sealing	Gland or heat-shrink, sized to your cable	One generic oval port
MOQ	200 pcs per family, mixed models share the run	1,000 pcs minimums
Quote speed	Within 24 hours on business days	Days
Range	Closures + boxes + splitters + cable, one order	Single category

And one habit worth naming: we ask for the cable diameters before quoting port seals. A closure port that does not match your cable is a leak designed at the quote stage - and we would rather design it out.

How We Work With You: From Route Plan to Loaded Pallets

Six steps, all written down:

• Step 1 - RFQ: send the closure types, port counts and cable diameters - or the route plan. WhatsApp +86 134 3434 9304 or the contact form.
• Step 2 - Quote: prices, MOQ, lead time and packing plan within 24 hours on business days.
• Step 3 - Samples: sample closures ship in 3-5 days - dunk one at your own bench, we invite it. Mixed closure orders share pallets with splitters, boxes and cable from the same factory.
• Step 4 - Production: photos at molding, gasket fitting and seal-test stages while your order runs.
• Step 5 - Inspection: 100% air-pressure test plus third-party inspection on request.
• Step 6 - Shipment: EXW, FOB Ningbo/Shanghai or CIF; documents within 3 working days of sailing.

Worked Example: Sealing a 120-Kilometer Feeder Route

Illustrative figures - your quote states yours. A contractor joints a 120 km feeder with 60 splice points and orders accordingly:

Step	Detail
Route review	48 dome closures for trunk joints, 12 horizontal for distribution taps
Port seals	Gland rings sized to the 12 mm feeder and 10 mm drop cables on the route
Production	8 days: molding, gasket fitting, tray stacking per closure
Seal test	Days 8-9: 100% pressurize-and-hold on 60 units; records filed per serial
Shipment	Day 10: palletized with splice protectors and gasket spares, FOB Ningbo

Ten days to a sealed, documented pallet set - and 60 pressure records in the file when the acceptance team asks. That is what ordering from a fiber optic splice closure manufacturer with its own test bench buys you.

FTTA Note: Closures at the Tower Base

Radio-unit fiber runs need small, sealed, low-count terminations at the tower base - and the FTTA cassette enclosure on this shelf exists for exactly that point:

• Capacity: 6-24 cores with cassette-style splice organization, sized for one sector cluster per box.
• Entries: gland-sealed ports for armored round cable from the radio runs.
• Environment: same IP68 sealing and temperature band as the trunk closures - tower bases see water, vibration and sun.
• Mounting: pole strap and tower clamp brackets in the carton.

Programs that mix FTTA enclosures with aerial junction boxes order both from this shelf - one part numbering scheme across the whole site build.

Emergency Note: Storm Repairs Run on a Different Clock

Storm damage does not wait for production windows. Stocked closure types ship emergency quantities in 48-72 hours (draft program - confirm current stock with sales), packed as crew kits: closures, gasket sets, port plugs and splice protectors in one box per jointing team. Programs that keep a two-joint kit per crew van turn a storm week into a work order instead of an outage report.

Seal the Route, Then Run the Whole Shelf

Closures guard the joints; the same factory ships everything between them: the cable on the route, the splitters that fit inside splitter-ready closures, the termination boxes at the buildings, the patch cords and connectors at every end, and the ODFs at the exchange. Level trouble on the run? Attenuators trim the hot ports, and the ODF planning guide maps the exchange before it locks. One purchase order, one freight plan, one warranty conversation.

Frequently Asked Questions

Splitter-Ready Closures: The Distribution Point in a Dome

Six of the families on this shelf are pure splice closures; two go further. Splitter-ready models carry a 1x8 LGX box or a steel-tube splitter inside the dome beside the splice trays:

• Layout: splitter in the lower chamber, splice trays above - the split point and its feeder joint share one sealed housing.
• Ports: eight SC/APC adapters on the dome collar face the drop cables; each port reads its own loss on the test sheet.
• Growth: an empty slot accepts a second splitter when the district fills - one closure, two phases.

For districts that would otherwise mount a separate splitter box beside the closure, the integrated build removes one housing, one visit and one leak risk. It is the closing argument a fiber optic splice closure manufacturer makes on rollout economics.

Accessories That Ship With Every Order

Each closure carton carries the mounting and sealing kit: dome-base bolts, gasket spares, port plugs for unused entries, stainless bond lugs, and the instruction card. Heat-shrink sleeve sets and gasket refill packs order as line items - crews that re-enter closures keep a gasket kit in the van, and we stock it to match your closure serials. Port plugs, grounding lugs and tray labels ship in the same kit, so a crew with one van box can joint, seal and document without a second order.