Crack-Sealing Machine Hose (JCH)

JCH is the crack-sealing machine hose from our electrically heated range, the line we supply for road-maintenance and crack-sealing equipment that must keep sealant hot and pumpable from the melter to the wand. The catalog places it with pavement crack-sealing machines. Maximum heat resistance is up to 230 °C (446 °F), higher temperatures are custom on request, and the catalog prints four bores for this product: 1/2", 5/8", 3/4" and 1". Proprietary inner-tube reinforcement is used for longer service life.

• Max heat resistance230 °C / 446 °F, higher on request
• Pressure classlow pressure, per-size table below
• Inner tubeB, TB, T or X build, 1/2"–1"
• Supply110 / 220 / 380 Vac, 12 Vdc
• SensorJ, K, Ni120, PT100, PT1000

Overview

The crack-sealing calls I get are rarely about a hose that burst. They are about a wand that starts to spit cold sealant halfway through a shift, a hose that stiffens after a few weeks of roadside work, or a line that kinks where it hangs off the machine deck. In every case the sealant cooled somewhere along the run, or the hose took a bend and a side load it was not built for.

Crack sealant has to stay hot from the melter to the crack. Once any section of the hose falls below the pour temperature, viscosity climbs, the wand pulls hard, and the bead goes stringy or stops. Road crews also coil and uncoil the line all day, drag it across asphalt and hang it on the machine, so the outer cover and the ends take more abuse than a plant hose that sits in a tray.

That is what the braided heating layer and the reinforced inner tube are for. The heating elements are braided uniformly around the hose rather than wound as a single strand, which keeps the temperature difference along the inner wall small. A single-strand winding leaves a warm side and a cool side; the cool side is where sealant starts to thicken. High-insulation-efficiency materials are chosen with surface temperature in mind, so the outer surface stays where you can handle the hose near the machine. The catalog calls out proprietary inner-tube reinforcement for longer service life on this product, which is the difference between a hose that survives a season of crack sealing and one that softens or collapses under repeated heat cycles.

Where it is the wrong choice: this is a four-bore, low-pressure crack-sealing line (1/2"–1"). If you need a smaller bore for a sample line, a hot-melt melter feed with sizes down to 1/4", or a high-pressure extrusion port, look at the heated sample line, hot-melt adhesive hose, extruder or special-industry heated hose instead.

Specifications

All values as printed in the Jingcheng 2025 electrically heated hose catalog.

Size and pressure table

All values as printed in the Jingcheng 2025 electrically heated hose catalog.

Full catalog: Heated hose catalog (PDF, 4.9 MB)

Materials and construction

• Inner tube: specified on the order form by model-code letter – B stainless corrugated tube, TB PTFE hose with stainless braid, T PTFE hose, X special material. For crack sealant the fluid temperature, viscosity and chemistry decide the tube; the catalog notes proprietary inner-tube reinforcement on this product for longer service life. Tell us the sealant type and the pour temperature.
• Heating layer: heating elements braided uniformly around the hose, which keeps the temperature difference along the inner wall small instead of leaving a hot stripe down one side.
• Sensor: a temperature sensor in the assembly, matched to your controller. Type J or K, Ni120, PT100 or PT1000, agreed on the drawing.
• Insulation and cover: high-insulation-efficiency material, selected with surface temperature in mind, under the yellow outer jacket shown in the photo.
• End fittings: a hose-end fitting at each end behind a metal collar, thread standard and size specified per end. The electrical lead exits at one end, as in the photo.

Temperature and pressure notes

230 °C (446 °F) is the maximum heat resistance of the series; the catalog marks higher temperatures as custom, on request. The useful number for a crack-sealing line is not the maximum, it is the pour temperature of your sealant at the pressure in the line. Set the controller above that with a margin, and pick the sensor position so the controller reads the section closest to the wand, not only the melter end where the sealant is hottest.

Pressure is given per size in the table above: working pressure 118 bar at 1/2", 88 bar at 5/8", 85 bar at 3/4" and 75 bar at 1", with burst pressure printed on the same row. A crack-sealing machine normally runs well below those figures, so the table is usually a large margin rather than a limit. What actually limits these lines in service is the bend: 150 mm minimum bend radius for 1/2", 180 mm for 5/8", 260 mm for 3/4" and 300 mm for 1", while the assembled hose as a whole is rated to a 0.2 m minimum bend radius. Treat the assembly figure as the rule for routing and the per-size figure as what the inner hose can take.

Keep the ambient inside −40 to +55 °C (−40 to 131 °F) at 85 % relative humidity or less, and keep the surroundings free of gases that corrode metal or damage insulation, of conductive media and of severe mould; anything outside that is a custom build. Do not twist the hose laterally during or after installation – a twisted crack-sealing line pulls itself into a tighter bend when it warms up.

Applications

The catalog application is road-maintenance and crack-sealing equipment. The settings we quote most:

• Pavement crack-sealing machines – the heated run from the melter to the wand or applicator
• Road-maintenance trucks and trailers – coiled deck lines that are handled every shift
• Hot sealant transfer between melter and dispenser where the pour temperature must be held

It is a low-pressure crack-sealing line. For a high-pressure connection or a plant melter feed with smaller bores, use the heated high-pressure builds or the hot-melt adhesive hose instead.

Options and related builds

• The long version: our article on the crack sealing hose covers construction, routing and how to specify one. This page is the product and its numbers; that one is the how and why.
• Before you specify: the heated hose specification checklist lists the inputs we need for a quotation, in the order we ask for them.
• Same family, different job: the hot-melt adhesive hose is the heated low-pressure build for adhesive machines, on the same T-STD table with sizes down to 1/4".
• Waterproofing sites: the waterproofing spray equipment heated hose is the sister build on the same T-STD table, with 1/2"–3/4" bores for non-curing waterproofing spray rigs.
• Sample lines: the heated sample line is the gas-sampling build in the same family, with smaller bores (3/16"–5/16").
• Gas lines on glass plant: the glass-line inert gas heated hose is the high-temperature, low-pressure build for glass production lines, 1/4"–1".
• Other heated builds: browse the Heated Low Pressure Hose and Heated High Pressure Hose families.

How to order

A JCH part number carries the main choices, so the fastest way to order is to quote one. The catalog example is JCH-200-16-B-3X220-P2-8-N:

1. 200 – working temperature in °C. 200 means 200 °C.
2. 16 – inner tube bore in mm. 16 means Φ16 mm.
3. Inner tube letter – B is a stainless corrugated tube, TB is PTFE hose with stainless braid, T is a PTFE hose, X is a special material.
4. Supply – 220 means 220 V, 3X220 means three-phase four-wire 220 V.
5. Sensor code – P2 is PT100 two-wire, P3 is PT100 three-wire, K is type K, J is type J, W is no sensor, T is a special sensor.
6. Pressure – working pressure in MPa. 8 means 8 MPa.

The four catalog bores for this product are 1/2" (Φ15.9 mm OD), 5/8" (Φ19 mm), 3/4" (Φ22.6 mm) and 1" (Φ29.5 mm); quote the size you need rather than the sample code above. If you do not have a part number, send these instead:

1. Bore and length, with the number of pieces, and the distance from melter outlet to wand or applicator.
2. What is in the line: sealant type, pour temperature and any modifiers.
3. The setpoint you run and the highest ambient the line passes through on the machine deck.
4. Pressure in the line and the pump rating.
5. Supply voltage and the controller or melter cabinet the line plugs into.
6. Sensor type and wiring, if the cabinet dictates it, plus the pin table if one exists.
7. End fittings at each end: thread standard, size, angle, with a photo or part number if you have one.
8. The route – coiled on the deck, hung on a boom, dragged – and the tightest bend on it.

If a drawing exists, send it. We propose the specification against it, you confirm it with the quotation, and production follows the confirmed specification.

Frequently asked questions

What is a crack-sealing machine hose?

An electrically heated, insulated hose that carries hot crack sealant from the melter to the wand without letting it cool enough to thicken. It is a heated inner hose with proprietary reinforcement, a braided heating layer over it, insulation, an outer jacket, a metal collar and fitting at each end, and an electrical lead at one end.

What temperature does it run at?

Maximum heat resistance is up to 230 °C (446 °F), with higher temperatures custom on request. Order the setpoint your sealant needs, which is set by the pour temperature, not by the maximum of the hose.

Which bore do I need?

The catalog prints four for this product: 1/2", 5/8", 3/4" and 1". The choice is usually driven by the pump flow and the wand orifice on your machine. Send the machine model or the existing hose size and we will match the bore to it.

Will it survive roadside coiling and dragging?

The catalog highlights proprietary inner-tube reinforcement for longer service life on this product, and the metal collars protect the hose where it leaves the fitting. It is still a hose with a minimum bend radius: route the run so no point goes tighter than the assembly limit of 0.2 m, and support the coil rather than letting it hang on the collar.

Can I use my existing melter controller?

Yes, if we know its sensor input and output type before the build. The catalog lists type J and type K thermocouples, Ni120, PT100 and PT1000 sensors, with PID control and SSR or thyristor output. Send the controller model or a photo of its label and the wiring is matched to it.

Is the line supplied with the fittings?

Yes. Both ends are specified separately on the order – US, British or metric threads, or another type – and made to order, so the line arrives ready to connect to your melter and your wand rather than needing adapters on site.

Source: Jingcheng 2025 electrically heated hose catalog, p.8 crack-sealing machine hose and p.4 order form and model code, and our published business policies.