Type 9AF: Silicone rubber heating belts for metal drums, with surface mounted bimetal thermostat

Main features

Silicone belt heaters are made of fiberglass reinforced laminated silicone rubber sheets, vulcanized together through heat and high pressure on both sides of an embedded specially formed heating wire element. Fiberglass-reinforced silicone rubber gives the heater dimensional stability without sacrificing flexibility.

Silicone is used because of its high temperature resistance (Permanent temperature up to 200°C /390°F), high thermal conductivity (~7 10-4 W/cm.K) and good electrical insulation properties (~12KV/mm)

This series is distinguished by the use of a bimetal thermostat mounted on the surface of the heating part, in a compact and economical design.

Other general particularities of these heaters are:

– Not affected by vibration or flexing,

– Lightweight,

– Comply with UL94-VO (flame retardant) and ROHS,
– Low smoke and low Toxicity,

– Silicone is non-toxic, and moisture and chemical resistant

-Very thin profile

Main Applications

Combining high power density with flexibility silicone heating belts are a simple and economical solution for heating metal drums.

They bring and maintain products to the consistency required for their use. Some typical applications examples are:

– Consistency control of paints, oils, greases, fats, molasses, adhesives, plastics, mastics, resins, syrups,

– Freeze protection,
– Maintaining liquid temperatures at 45-65°C (115-150°F) in food industry water purification systems,
– Maintain polyester resin at 20-25°C (70-80°F) for spray and pour equipment.

Technical Features

Clamping on drums: By spring and hook lock-up that allows adjusting the band to the drum diameter; change position to the right place as content levels fluctuate; and also keeps the band tight to the drum surface, providing good thermal contact. Clamping force of each spring is from 1 to 3DaN in the recommended drums diameter range. The spring is equipped with a pull ring for easy installation and removing of the belt.

Length (Dimension A): Designed to be used on standard container diameters. Consult factory if a custom size is requested.

Width (dimension B): 100mm (4″). Heating belts must always be applied on cylindrical surfaces without hoops or ribs.

Silicone foil minimum bending radius: 3.2 mm (0.125″)

Ingress protection: IP54.

Minimum ambient temperature: -10o C (+15o F)

Voltage:  220-240VAC.

Power tolerance: ±10% at 20°C

Temperature control:

Single pole bimetal thermostat, adjustable from 20°C to 150°C (50~300°F) or from 50 to 200°C (120~390°F). Creep action contact, rating 1500W, 110 and 230V. This low rating limits the possible width of these belts to 100mm

Power density:

– 0.75 w/cm2 (4.8 w/inch2), for usual applications.

– 1 w/cm² (6.5 w/inch2) for fast heating applications

Thickness of the flexible silicone foil: 2.5mm. (Optional 3.2mm, for heavy duty applications requiring strong mechanical strength and reinforced insulation).

Quality control routine tests: Each element is 100% tested for continuity, resistance and insulation. Tests are made according to EN 60335-1 and EN 50106 standards. See technical introduction.

Dielectric Strength: 1750V AC.

Insulation resistance: ≥ 10 Megohms.

Operating temperature:

The temperature controlled by the thermostat is that of the heating surface. The temperature of the heated product is generally much lower than that of the surface and depends mainly on the surface power (W/cm²), the quality of the thermal contact with the container, the viscosity, heat capacity and thermal conductivity of the heated product, the good positioning of the heating belt, the set point value, and room temperature

You can find in the technical introduction examples of the temperatures reached by silicone heating belts. They represent the temperature that may reach the heating belt if it is not correctly installed (for example: poor thermal contact, empty container or improperly temperature controlled).

Connection cable:

Insulated rubber power supply cable, for industrial environments, 3 x 1mm² length 3m, Euro plug. UL plug on request.


– 3.2mm reinforced thickness.

– Power supply 110/115V

– Power cord with industrial plug 2-pole + earth 16A CEE (IEC60309)

– Surface temperature limiter.

– Grounded mesh wire shield layer

– Power density reduced to 0.2 W/cm² (1.3 w/inch²) for plastic containers. In this power density, models in 200 and 300mm width can be made

– Outside thermal insulation by silicone foam layer

Safety standards:

The heaters have been designed in compliance with EEC Low Voltage Directive (LVD) 2006/95/EC and EMC directive 2004/108/EC. They must be installed in accordance with all local applicable instructions, codes, and regulations.


Main parts numbers in 220/240V, width 100mm, with 3 meters cord and euro plug*  

(See the technical introduction for the liquids heating time)


Liters (Gallons)


Part number with 30-150°C (50-300°F) thermostat***


Part number with 50-200°C (120-390°F) thermostat *** High and low limits of acceptable diameter (measured at no-hoops or no-ribs place)

mm (inch)

A Length

mm (inch)


Power density W/cm²






57~60 (16) 9AFB8E1102855C30 9AFB8W1102855C30 356-373 (14-14.7) 1020 (40.1) 0,75 (4.8) 550
57~60 (16) 9AFBBE1102874C30 9AFBBW1102874C30 356-373 (14-14.7) 1020 (40.1) 1 (6.5) 740
110~120 (30) 9AFB8E1135875C30 9AFB8W1135875C30 463-480 (18.2-18.9) 1350 (53.1) 0,75 (4.8) 750
110~120 (30) 9AFBBE11358A0C30 9AFBBW11358A0C30 463-480 (18.2-18.9) 1350 (53.1) 1 (6.5) 1000
208~210 (55) 9AFB8E1169895C30 9AFB8W1169895C30 571-588 (22.5-23.2) 1690 (66.5) 0.75 (4.8) 950
208~210 (55) 9AFBBE11698A3C30 9AFBBW11698A3C30 571-588 (22.5-23.2) 1690 (66.5) 1 (6.5) 1300

* Cord with UL plug instead of Euro plug, replace C30 by D30 in the Part number.

** Values above 1500W are not compatible with the 6,5A 230V rating of the single pole thermostat.

*** Thermostat knob is not printed in degrees

**** 3.2mm reinforced thickness, replace FB by FC in the Part number.


2D&3D Drawing