Fiber Optic Fusion Splice Protection Sleeves

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Match the Sleeve to Your Splice Tray

Sleeve length is only part of the specification. Two sleeves with the same nominal length can have different reinforcing rods and recovered outer diameters, so they may fit different tray holders. Check the space available along the holder, the diameter it is designed to retain and the coated or buffered fiber that must pass through the inner tube.

In the dimensional listing, 60 × 1.2 × 55 identifies a nominal 60 mm sleeve with a 1.2 mm diameter reinforcing rod that is 55 mm long. The inner tube bore for this model is listed separately as 1.5 mm. Include the complete size designation when replacing an existing sleeve or requesting a quotation.

OD means outer diameter; ID means inner diameter. A–E identify dimensional groups. For groups A–C, rod lengths are 55, 40, 35 and 18 mm for the nominal 60, 45, 40 and 23 mm models respectively. In groups D and E, the rod length matches the nominal sleeve length.

Length and tolerance notes. For nominal 60 mm models, the dimensional sheet lists both outer and inner tube lengths as 61 ±1 mm. Other listed tube lengths match the nominal model length, with a ±1 mm tolerance. The listed tolerances are ±0.2 mm for recovered sleeve OD and ±0.1 mm for inner tube ID and rod diameter; rod length tolerance is ±1 mm. Confirm the model drawing when matching a holder with limited clearance.

Detailed model dimensions 18 models · all dimensions in mm

The 0.35 mm inner bore in group E requires particular attention to the fiber diameter and loading clearance. Do not select it on sleeve length alone. Before a repeat installation or volume order, check a sample through the complete sequence: loading, heating, cooling and placement in the intended tray holder.

What Protects the Splice

 

From Fusion Splicing to Sleeve Placement

 

Load the sleeve before splicing.

Position it over the splice area.

Use the matching heater program.

The sleeve is loaded before splicing and heated after the fiber joint is complete. Keep the sleeve, the exposed fiber and the splice area clean throughout the operation.

Look for exposed bare fiber, obvious bubbles, uneven recovery, sleeve displacement or a reinforcing rod that has shifted out of position. Investigate visible defects before securing the splice. A sleeve that does not seat correctly should prompt a dimensional check of both the sleeve and holder.

Heating time and heater settings depend on the selected sleeve and equipment. Confirm the program through a sample installation, particularly when changing sleeve dimensions or splicer models.

Splice Protection Inside Fiber Distribution Equipment

These single fiber splice protection sleeves are intended for protected splice locations within fiber distribution equipment. Match the sleeve to the internal holder and fiber routing space in the equipment you use.

 

In a splice tray or splice closure, check both recovered diameter and usable sleeve length against the retaining slots. The cooled sleeve should sit in its intended position while the surrounding fibers follow the tray routing path.

 

In a fiber terminal box or FTTH distribution box, available space may limit sleeve length and the route of the fibers at either end. Include the box or tray model, or a photograph with dimensions, when the required sleeve size is uncertain.

 

For pigtail splicing and maintenance replacements, compare the complete sleeve dimensions with the existing installation. A familiar nominal length alone does not establish compatibility with the replacement holder or fiber construction.

 

Fiber Splice Sleeve FAQs

What is a fiber optic splice protection sleeve used for?

A fiber optic splice protection sleeve covers the stripped fiber section after fusion splicing and provides mechanical support during handling and tray placement. This FOCC range combines a clear heat-shrink outer tube, an inner hot-melt tube and a stainless steel reinforcing rod. The sleeve is positioned over the completed splice, heated and allowed to cool before it is secured in a compatible holder.

How do I choose between 40 mm and 60 mm splice protection sleeves?

Choose a 40 mm or 60 mm splice protection sleeve according to the holder length, the area requiring protection and the heater's supported sleeve size. Check recovered outer diameter as well as length. In this range, the 40 × 1.2 × 35 and 60 × 1.2 × 55 models both have a listed recovered OD of 2.6 mm, but their tube and rod lengths differ.

What does 60 × 1.2 × 55 mean on a fiber splice sleeve?

In the FOCC size listing, 60 × 1.2 × 55 means nominal sleeve length × reinforcing rod diameter × rod length, in millimeters. The inner tube bore is listed separately as 1.5 mm. For this nominal 60 mm model, the dimensional sheet specifies outer and inner tube lengths of 61 ±1 mm; use the confirmed drawing when checking a holder with limited clearance.

How do I select a splice sleeve for 250 μm or 900 μm fiber?

Select the inner tube bore around the coating or buffer that must pass through the sleeve: 250 μm equals 0.25 mm, and 900 μm equals 0.9 mm. Allow loading clearance and check the dimensional tolerances. The listed 0.35 mm bore in group E cannot pass a 900 μm buffer. Confirm the complete sleeve and holder fit with a sample installation.

Can the same splice protection sleeve be used for single-mode and multimode fiber?

Single-mode or multimode classification alone does not determine sleeve compatibility. For either fiber type, check the coating or buffer diameter, exposed section length, inner tube bore, recovered sleeve diameter and holder dimensions. This FOCC range is specified for individual fiber splices; confirm compatibility with the actual fiber construction and installation equipment before selecting a model.

Can these single fiber sleeves be used for ribbon fiber splices?

The listed FOCC sleeves are specified for individual fiber splices. A ribbon splice requires a protector selected for its ribbon configuration, width and fiber count, together with a matching heater and holder. Treat ribbon protection as a separate specification when requesting a quotation, and provide the ribbon dimensions and equipment details.