A ceramic fiber braided sleeve is a flexible insulating cover for routing wires, cables, hoses, tubes or pipes near high-temperature equipment. To select one, start with the part’s outside diameter and movement, then confirm the sleeve’s temperature rating for the actual construction and exposure. The product listing gives nominal inside diameters from 6 mm to 51 mm, a standard wall thickness of 2 mm, and temperature figures that vary by section of the listing. Treat those figures as a starting point and obtain the rating for your exact size and service conditions before approving a design.

What this sleeve is designed to do

PKfiresleeve’s CRS ceramic fiber braided sleeve is made from alumino-silicate ceramic fiber nonwoven material. The product is described as soft, pliable and lightweight, with low thermal conductivity and good dielectric strength. It is intended for thermal insulation and protection of industrial wires, cables, hydraulic hoses, tubes and pipes.

The sleeve can help reduce heat transfer to a protected component and limit direct exposure to radiant or nearby heat. It is not a substitute for a system-level thermal assessment, electrical insulation design, guarding or personal protective equipment. A covered hot line can still cause burns, and a sleeve’s dielectric description does not establish a voltage rating for a particular installation.

How to choose the sleeve size

1. Measure the largest outside diameter. Include couplings, fittings, clamps and any section that the sleeve must pass over during installation.
2. Allow for movement and service access. A close fit can be difficult to install over bends or connectors. A very loose fit may bunch, shift or leave parts exposed.
3. Check the route. Note bend radius, abrasion points, vibration, nearby edges and whether the sleeve needs to be installed before the hose or cable is connected.
4. Confirm the nominal size with a sample. The product table lists nominal IDs from CRS-6 through CRS-51 (6–51 mm) and a standard thickness of 2 mm. Confirm actual inside diameter, tolerance, wall construction and fit with the supplier for the selected size.
5. Plan the ends and retention. Decide how the sleeve will be kept in place and whether the ends need finishing or additional protection. Confirm compatible fastening methods for the temperature and environment.

For an assembly with fittings larger than the hose or cable body, verify that the sleeve can be installed over the largest feature—or specify an installation sequence that avoids stretching or damaging it.

Read temperature figures in context

The CRS product page contains different temperature statements: a technical table lists an operating range of −40°C to +1260°C and a melting point of +1650°C, while its feature text also refers to continuous service at 2000°F and excursions to 3000°F (about 1650°C). These figures are not interchangeable. A melting point is not a recommended continuous-use temperature, and an excursion statement does not define an allowable duration, load or installation condition.

Before specifying the sleeve, ask for written confirmation of the allowable continuous and intermittent temperatures for the exact product size and construction. Share the expected exposure type (ambient, radiant, flame or hot-fluid contact), duration, cycling, mechanical contact and whether the protected part itself has a maximum temperature. If the application is safety-critical, validate it under representative operating conditions.

When ceramic fiber sleeving may fit—and what to compare

Consider the CRS sleeve when a flexible, ceramic-fiber-based insulating cover is needed around a cable, hose, tube or pipe in a high-heat area. For installation and product details, see the ceramic fiber braided sleeve product page or browse the high-temperature sleeve range.

Different fiber constructions suit different temperature, handling and exposure requirements. If you are comparing this product with a silica-fiber sleeve, review the silica fiber braided sleeving details and compare the confirmed ratings for each product rather than choosing by fiber name alone.

Questions to send with an RFQ

• What is the actual outside diameter, including fittings, and what nominal sleeve ID do you recommend?
• What are the continuous and intermittent temperature limits for this exact size and construction?
• Are the quoted limits for radiant heat, ambient heat, direct contact or a defined test setup?
• What wall thickness and dimensional tolerance apply to the requested size?
• How should the sleeve be installed, retained and finished at its ends?
• Can you provide a sample for fit and application testing?

Frequently asked questions

What sizes are listed for the CRS ceramic fiber braided sleeve?

The product table lists nominal IDs from 6 mm to 51 mm. Confirm the actual dimensions and tolerances for the selected size before ordering.

Does a 1650°C melting point mean the sleeve can run continuously at 1650°C?

No. Melting point, continuous service temperature and short-duration exposure are different ratings. Request the written service limit for the exact construction and operating conditions.

Can this sleeve make a hot hose safe to touch?

Do not assume so. The sleeve may reduce heat transfer, but the outside surface can remain hot. Assess contact temperature and retain appropriate guarding and safety controls.

Is the sleeve electrically rated because the listing mentions dielectric strength?

Not by that statement alone. Ask for the applicable dielectric test data and voltage rating for the intended construction and environment.

To request a size recommendation or sample, provide the component outside diameter, heat exposure, operating cycle and installation constraints with your inquiry.