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Temperature Control Hoses for Mold Cooling — Selection, Design, and Application

Temperature control hoses for mold cooling reliably transfer heat or cold in temperature-controlled circuits. Crucial factors include material, wall construction, nominal diameter, connection type, and temperature range. For industrial mold cooling, hoses made of **PVC, FKM, EPDM, silicone**, and **PKR/NBR rubber** are commonly used; each material offers specific advantages and disadvantages regarding chemical resistance, temperature stability, flexibility, and abrasion resistance.

Material Properties and Application Limits

PVC hoses offer good cost-effectiveness and sufficient flexibility for moderate temperatures up to approximately +60 °C. They are resistant to many hydraulic and and cooling fluids, but have limited resistance to higher temperatures, aromatic hydrocarbons, and certain additives. EPDM hoses better withstand heat, steam, glycols, and strongly alkaline media; operating temperatures typically range between −40 °C and +120 °C. FKM (Viton) is characterized by excellent resistance to oils, fuels, and many chemicals, and remains stable at higher temperatures; recommended for applications with elevated thermal and chemical demands up to approximately +200 °C. Silicone hoses are particularly temperature-resistant and flexible at very high and very low temperatures (typically −60 °C to +200 °C), chemically inert to many media, but mechanically less abrasion-resistant. PKR and NBR (nitrile) hoses are economically robust, oil-resistant, and suitable for moderate temperatures; NBR is particularly oil and fuel resistant, while PKR offers increased tear strength in rubber-based compounds.

Wall Construction, Fabric Reinforcements, and Pressure Resistance

Temperature control hoses are manufactured as single-layer or multi-layer constructions. A single-layer profile is suitable for applications with low pressures and high flexibility. Multi-layer hoses contain textile or spiral fabric reinforcements (polyester, aramid) or wire braids to safely cover operating pressures from a few bar to over 30 bar. Pay attention to the operating, test, and burst pressure ratings specified by the manufacturer. For closed circuits with pumps and control valves, pressure stability is crucial, as cavitation, pressure peaks when starting pumps, and thermal expansion can otherwise lead to damage.

Connections, Seals, and Installation Notes

Connection types influence leak-tightness and installation safety. Common connections include hose fittings with cone/union nut, hose clamps for smooth hose nozzles, press-fit or crimp connections, and special quick couplings for cleaning and maintenance purposes. For metallic fittings, **O-rings made of FKM, EPDM, or NBR** are the standard seals; the material choice depends on the medium and temperature. EPDM O-rings offer good heat and glycol resistance, FKM O-rings are the choice for oil and high-temperature environments, NBR is suitable for oil-containing media at moderate temperatures. For crimp connections, use the specified die sets and regularly check crimp widths. Ensure correct hose overlap and hose clamp design to prevent slipping or kinking in bending zones.

Temperature Ranges, Media, and Chemical Resistance

Select temperature control hoses based on the heat transfer medium used: water/glycol mixtures, heat-resistant thermal oils, silicone-based heat transfer fluids, or gaseous media require different materials. Glycol-containing coolants attack some elastomers; EPDM or special FKM compounds are recommended here. When using thermal oils and higher temperatures, silicone and FKM are the first choice, while PVC and NBR are economically sensible for low-temperature water/glycol circuits. Always check the manufacturer's resistance tables and consider additives, catalysts, or cleaning chemicals used when flushing the system.

Selection Criteria for Practical Use

Select the nominal diameter based on the volume flow and permissible pressure difference. Collapse and cavitation tendencies increase with too small a diameter; too large a diameter reduces pump efficiency. Consider the bend radius: tight bend radii increase local stresses and shorten service life. Temperature cycling demands materials with high flexibility and low aging. Pay attention to conformity with relevant standards and, if necessary, food-grade suitability or specific industry approvals.

Practical Examples — Structured Application Scenarios

**Example 1 — Injection Mold with Glycol Cooling:** In an injection molding plant, an EPDM temperature control hose DN12 is used to convey water/glycol at 20–80 °C. The hose runs over a 6 m path between the central cooler and the mold manifold. For installation, crimpable stainless steel connections with EPDM O-rings are used, in conjunction with fabric-reinforced EPDM hoses, to safely cover an operating pressure of 8 bar. During maintenance, the system is flushed with demineralized water; all O-rings and screw connections are checked for damage. **Example 2 — High-Temperature Mold Cooling with Thermal Oil:** For mold cooling with thermal oil up to 180 °C, silicone or FKM hoses with wire reinforcement are used. The DN16 hoses are connected with stainless steel crimp fittings that use FKM O-rings. Due to high temperatures, the line is thermally decoupled and routed with flexible bend radii to avoid stress cracks. A pressure monitor supervises system pressure and triggers a shutdown if 12 bar is exceeded. **Example 3 — Temporary Repair on a Production Line:** In the event of a leak in a mold cooling system, an NBR hose with hose clamps is temporarily used as an emergency solution until a suitable EPDM hose, including professional crimp connections, can be procured and installed. During the temporary solution, only low pressures and temperatures are used, and the zone is continuously monitored.

Installation and Maintenance Recommendations

Before installation, check cut surfaces for burrs and damage, measure the inner diameter of the connection nozzle, and select the appropriate hose length considering thermal length changes. Fasten hoses without twisting and avoid abrupt kinks; use hose guides and clamps with rubber inserts for pressure relief. Document the installation location, material, and manufacturing date in the maintenance system, plan regular visual inspections for cracks, plasticizer loss, hardening, and efflorescence. After replacing parts, perform a pressure and leak test with the intended medium or with water before resuming production.

Compatible Products and Extended Information

For technical details on materials, connection variants, and installation-specific recommendations, please refer to the technical pages and case studies: Technik and Anwendungsbeispiele. There you will find tables on pressure and temperature ranges, recommended bend radii, and test methods, as well as standardized connection dimensions.

One-Channel Checklist

• Select material based on medium and temperature; check operating pressure and bend radius; coordinate connection type and seal.

Service Life and Failure Patterns

Common causes of failure include thermal aging, chemical attack by unsuitable media, mechanical abrasion, and incorrect installation. Thermal cracks often occur at bend radii near the connection zone; hoses with wire or fabric reinforcement reduce this risk. Plasticizer loss leads to embrittlement and fine hairline cracks; in such cases, replacing the hose is mandatory. For continuous operation and high cycle loads, FKM or silicone solutions with appropriate reinforcement are recommended.

FAQs

What are typical temperature ranges for temperature control hoses?

This varies by material: PVC up to ~+60 °C, EPDM up to ~+120 °C, NBR/PKR up to ~+100 °C, silicone and FKM up to ~+200 °C. Refer to manufacturer data sheets and application configuration for specific values.

Which material is suitable for glycol-containing coolants?

EPDM is generally compatible with water/glycol mixtures. FKM can be used if additional chemical resistance or higher temperature stability is required. Check additives and glycol concentration against manufacturer resistance tables.

How do I know when a hose needs to be replaced?

Replacement is mandatory for visible cracks, hardening, tears at bend radii, efflorescence, hose bulging under pressure, or after reaching the planned service life according to the maintenance schedule.