| HS Code | 543553 |
| Product Name | Cooling Liquid Products RH-TMM-2 |
| Product Code | RH-TMM-2 |
| Product Type | Cooling liquid / heat transfer fluid |
| Physical State | Liquid |
| Appearance | Clear homogeneous liquid |
| Color | Colorless to pale yellow |
| Odor | Mild characteristic odor |
| Ph | 7.0–9.0 |
| Density | 1.00–1.10 g/cm³ at 20 °C |
| Boiling Point | >100 °C |
| Freezing Point | <-30 °C |
| Flash Point | >100 °C |
| Water Solubility | Miscible |
| Thermal Conductivity | 0.35–0.45 W/(m·K) |
| Specific Heat | 3.5–4.0 kJ/(kg·K) |
| Viscosity | 2–5 mPa·s at 25 °C |
| Storage Conditions | Store in a dry ventilated area at 5–30 °C |
| Shelf Life | 24 months in unopened container |
| Packaging | 5 L, 20 L, 200 L containers |
As an accredited Cooling Liquid Products RH-TMM-2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 5 L high-density polyethylene jugs with secure screw caps and chemical-resistant labels for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Cooling Liquid Products RH-TMM-2, properly packed and secured for safe transport per chemical handling requirements. |
| Shipping | Ship Cooling Liquid Products RH-TMM-2 in original, sealed, labeled containers, protected from heat, freezing, and impact. Secure cargo against leakage; include SDS and shipping documents. Verify hazard classification and transport regulations before dispatch, follow package orientation, and use a qualified carrier. |
| Storage | Store RH-TMM-2 in its original, tightly closed, clearly labeled container in a cool, dry, well-ventilated area, away from direct sunlight, heat, ignition sources, and incompatible materials. Keep containers upright, protect from freezing and contamination, use secondary containment where required, avoid excessive stacking, ensure appropriate ventilation, inspect containers regularly, and follow the supplier SDS and local storage regulations. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored unopened in original container, protected from freezing and extreme heat. |
In high-density data center rear-door and direct-to-chip liquid cooling systems, RH-TMM-2 is blended with ASTM D1193 Type IV water to a final charge of 25–40% v/v and circulated through stainless steel CDU headers, brazed plate heat exchangers and nickel-plated copper cold plates. Supply temperature is held at 32–45°C according to ASHRAE TC 9.9 liquid cooling guidance, while differential pressure across the CDU pump is maintained between 150 kPa and 250 kPa. The pump curve is selected to keep a Reynolds number above 4,000 inside the smallest distribution tube, typically 8–10 mm copper tubing, to prevent fouling film accumulation on cold plate channels. Production-scale service records identify two recurring failure modes in these systems: pump seal leakage when coolant volume fraction exceeds 50% v/v because increased viscosity reduces suction-side NPSH margin, and localized aluminum pitting at hose barb adapters when chloride concentration exceeds 25 mg/L from uncontrolled top-up water. Commissioning therefore includes chloride screening, pH adjustment to 8.0–9.5 per ASTM D1287-11, and glassware corrosion coupon exposure according to ASTM D1384-18. The fluid is not approved for direct immersion of live electronics because water-diluted coolants retain electrical conductivity unless specifically validated. Terminal products in this segment are integrated cold plate assemblies and sidecar heat rejection units installed in hyperscale server racks.
When high-speed polypropylene closure molds operate at 6–8 s cycles, the circuit is charged with 25–35% v/v RH-TMM-2 and delivered through 8–10 mm drilled tool channels at a mold inlet pressure of 0.3–0.5 MPa. The minimum linear velocity is set at 2.0 m/s in the gate area and 1.0 m/s in the return channel, corresponding to a Reynolds number above 10,000 in the core pins; below this threshold, hot spots remain around the sprue bushing and cycle time increases. A backpressure valve on the return side maintains 1.0–1.5 bar to suppress nucleate boiling at the steel surface during peak heat flux. Field observations from 250–500 tonne injection machines indicate that suspended solids above 15 mg/L in the mold circuit reduce heat transfer coefficient at brazed plate heat exchangers and produce orange staining on tool cooling channels. The coolant is filtered to 5 µm, maintained at pH 8.0–9.0, and qualified for hot tool steels, beryllium copper inserts and brass quick-connect fittings through ASTM D1384-18 coupon testing before first production. Process water with total hardness above 170 mg/L as CaCO₃ must be softened to prevent scale deposition around turbulent bends. Finished parts include thin-wall beverage closures, multi-cavity PP caps, and disposable food tubs.
Secondary coolant loops serving ice storage coils and coolant-to-air heat exchangers in refrigerated warehousing operate with 40–50% v/v RH-TMM-2 where supply temperatures drop to -12°C to -25°C. The freeze point of each diluted batch is verified by ASTM D1177-17. The application is steady-state heat transfer against a melting ice bed; no further process adjustment is required beyond batchwise concentration monitoring and closed-loop blanketing to exclude air. The main operational boundary is avoidance of open refill with hard water containing more than 100 mg/L calcium, which precipitates on coil surfaces under sub-zero thermal gradient.
For engine dynamometer cells where single-cylinder gasoline and diesel engines are run at full load for 8–12 h sequences, RH-TMM-2 is mixed at 50% v/v with ASTM D1193 Type IV water to provide freeze protection and a boiling point reserve above 130°C at 100 kPa system pressure. The fluid contacts cast iron liners, aluminum cylinder heads, and copper-brass oil coolers; qualification is therefore performed to ASTM D6210-20 and ASTM D4340-19 for corrosion mass-loss control at 135°C under heat-rejecting conditions. Fleet audit data from wet-sleeve diesel test cells show liner pitting when nitrite-based inhibitor concentration falls below 25 mg/L as monitored by ASTM D4327. Amine-containing aftermarket top-up fluids are not blended into the system unless mixture stability is validated by ASTM D1122-22 water content measurement and ASTM D1287-11 pH checks at 0°C, because precipitate formation is a known cause of seal leakage and coolant passage plugging. Terminal output is controlled engine heat rejection in R&D test cells, enabling accurate brake specific fuel consumption measurement under repeatable thermal load.
| Application Segment | Fluid Concentration | Qualification Standard | Operating Limit / Monitored Parameter |
|---|---|---|---|
| Data center cold plate recirculation | 25–40% v/v | ASHRAE TC 9.9, ASTM D1384-18 | pH 8.0–9.5; chloride <25 mg/L |
| Injection mold cooling | 25–35% v/v | ASTM D1384-18 | Reynolds number >10,000; inlet 0.3–0.5 MPa |
| Low-temperature thermal storage | 40–50% v/v | ASTM D1177-17 | Freeze point -25°C; calcium <100 mg/L |
| Engine dynamometer coolant | 50% v/v | ASTM D6210-20, ASTM D4340-19 | Aluminum mass loss at 135°C; nitrite >25 mg/L |
| Stationary battery thermal management | 30–40% v/v | ASTM D1384-18 | No direct cell contact; return filtration 10 µm |
| Chemical reactor jacket cooling | 40% v/v | ASTM D1384-18 | Continuous jacket return <95°C; iron/molybdenum trace at 500 h |
Containerized lithium iron phosphate battery racks require liquid cooling plates mechanically clamped to prismatic cell faces. RH-TMM-2 is diluted to 30–40% v/v and circulated through aluminum microchannel cold plates at 10–20 L/min per rack, with supply temperature controlled at 18–25°C by an external chiller. The loop contains mixed metals: aluminum 3003 cold plates, stainless steel piping, and brass flow meters; galvanic compatibility is assessed by ASTM D1384-18 coupon testing, with particular attention to copper and zinc mass losses. Published data for this exact mixed-metal BESS loop configuration is limited, so a coupon test is mandatory before continuous service. The coolant is confined to sealed cold plates and never contacts cell tabs or busbars directly, because a water-diluted heat transfer fluid is not a dielectric barrier. Filters rated at 10 µm are placed on return headers to capture corrosion debris before it enters plate fin channels. Terminal products are thermal management subsystems for 10–40 ft BESS containers and high-power charging skids.
Fine chemical and polymerization reactors with jacket volumes from 500 L to 10,000 L circulate RH-TMM-2 at 40% v/v to control exothermic batch temperature between 60°C and 120°C. Jacket heat removal is constrained by the approach temperature across the shell-and-tube exchanger; a 5–10°C approach is maintained by adjusting primary cooling water flow. The coolant is qualified for carbon steel and 316L stainless steel wetted parts by ASTM D1384-18 corrosion coupon exposure, with trace iron and molybdenum analysis at 500 h intervals. Field records from multipurpose plants indicate that organic inhibitor depletion accelerates when the jacket return temperature exceeds 95°C for prolonged periods, so the recirculation tank is blanketed with nitrogen to reduce oxygen ingress. Terminal products include batch resins, aqueous dispersions, and alkyd intermediates.
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Cooling Liquid Products RH-TMM-2 is specified as an inhibited ethylene glycol-water heat transfer fluid for closed-loop industrial cooling circuits where mixed metallurgy and high heat flux demand a non-silicate, non-phosphate inhibitor package. The product is manufactured as a 50 vol% prediluted solution, with a reserve alkalinity of ≥12.0 mL 0.1 N HCl per ASTM D1121, and is formulated without silicate, phosphate, nitrite, borate, or amine inhibitors according to the manufacturer’s disclosure. The designation RH-TMM-2 identifies an organic acid-azole inhibitor system intended for systems containing copper, brass, steel, cast iron, and cast aluminium. Its bulk-fluid operating window is −35 °C to 95 °C, with local surface temperature limits stated in the supplier’s application bulletin. The product is used in injection-mould temperature-control units, chiller loops, compressor intercoolers, laser-oscillator cooling circuits, and data-centre rear-door heat exchangers where silicate gel deposition and hard-water phosphate scale are unacceptable. Maintenance logs from aluminium die-casting plants show that switching from a silicate-containing coolant to an organic acid-azole fluid reduced backside core deposit thickness but increased the importance of strainer maintenance because existing old deposits can be mobilised.
The release limits for prediluted RH-TMM-2 are stated in the supplier’s batch certificate. The values in Table 1 are manufacturer-controlled limits for a 50 vol% premix; concentrate-derived dilutions must be checked against the same methods after field mixing.
| Property | Method | Specification limit |
|---|---|---|
| Appearance | ASTM D1881 | Clear, no suspended matter or phase separation |
| Reserve alkalinity | ASTM D1121 | ≥12.0 mL 0.1 N HCl |
| pH, 50 vol% solution | ASTM D1287 | 8.0–9.5 |
| Specific gravity, 20 °C/20 °C | ASTM D1122 | 1.080–1.100 |
| Freezing point, 50 vol% | ASTM D1177 | ≤−38 °C |
| Boiling point, 101.3 kPa | ASTM D1120 | ≥108 °C |
| Water content | ASTM D1123 | 50–54 mass% |
| Foam volume, 88 °C | ASTM D1881 | ≤10 mL |
| Chloride | ASTM D3634 | ≤25 mg/kg |
The product is delivered as a 50 vol% prediluted mixture in 200 L drums and 1,000 L intermediate bulk containers; concentrate is available for bulk silo delivery if site dilution control is validated. The density and refractive index are used as rapid field checks: at 20 °C, a refractometer reading of 1.3800 nD corresponds to approximately 50 vol% ethylene glycol, and a deviation of ±0.002 nD indicates off-spec dilution or contamination. This field check is not a replacement for full ASTM D1122 density and ASTM D1123 water content measurements. Batch-to-batch variation in reserve alkalinity is controlled within ±0.5 mL according to the supplier; blending logs from a 2,000 L reactor with a bottom-mounted high-shear disperser indicate that 120 minutes of circulation at 40 °C is required to homogenise the azole predispersion. Insufficient mixing can produce a transient azole-poor top layer that results in brass discoloration on the first charge of newly filled loops.
A 40 vol% dilution lowers the freezing point to approximately −23 °C, and a 30 vol% dilution to approximately −14 °C; the freeze-protection curve is nonlinear. If the product is diluted with field water instead of ASTM D1193 Type IV reagent water, chloride above 25 mg/kg, sulfate above 50 mg/kg, or total hardness above 100 mg/kg as CaCO₃ compromises inhibitor film formation on aluminium and copper. One closed-loop chiller investigation recorded calcium glycolate deposition on a nickel-brazed evaporator plate within 900 operating hours when untreated bore water with 180 mg/kg bicarbonate was used as top-up; the same loop operated without plate deposit after top-up was changed to reverse-osmosis water with conductivity below 5 µS/cm.
Before the product is charged into a rebuilt loop, residual silicate gel and phosphate scale from prior coolants should be removed by circulating a 1–2 vol% alkaline cleaner at 40–50 °C for 4–6 h, followed by a deionized-water flush until effluent conductivity drops below 10 µS/cm and pH stabilises between 7 and 8.5. This pre-cleaning is required if the previous coolant was silicate-based or if visible gel is present in the strainer; skipping this step can produce hard agglomerates within 48–72 h after inhibitor bridging.
In a 1,000 kN clamp-force injection-moulding cell running glass-filled polyamide, the mould-temperature control unit delivering RH-TMM-2 at 90 °C to a tool with 6 mm channels operated at 20 L/min per circuit; this corresponds to a channel velocity of 2.1 m/s. Pressure drop across a 400 mm channel is 0.35 bar; total system charge volume is 25 L, and the expansion-tank ullage is 10 % of charge volume. Pump suction strainers must be 500 µm or finer; coarser mesh has allowed mobile casting-sand particles to damage ceramic pump seals within 2,000 operating hours in die-casting plant service. For brazed plate coolers, external skin temperature at the plate edge should remain below 150 °C; above this threshold, glycol oxidation accelerates and the azole film on copper begins to desorb. Published data for this specific configuration are limited, but maintenance records from three moulding lines indicate that pH drift beyond 9.5 is associated with aluminium etch on EN AW-3003 channel walls after 30 operating days.
Extended operation at bulk temperatures above 95 °C with copper-brazed plate exchangers should be avoided unless dissolved oxygen is maintained below 0.1 mg/L; above this temperature, ethylene glycol oxidation to glycolic and formic acids accelerates, with pH dropping by 0.5–1.0 units per 1,000 h in unvented loops. Vented loops exhibit faster pH depression. Reserve alkalinity should be checked every 12 months; if it falls below 6.0 mL, inhibitor recharge or complete change-out is required. The fluid must not be mixed with methylene chloride-based strippers or aromatic hydrocarbons; such contamination plasticizes nonmetallic seals and lowers the flash point of the water-glycol mixture.
In data-centre rear-door heat exchangers, the product is circulated through copper microchannel cold plates at supply temperatures of 18–22 °C. The low-temperature loop does not require the same freeze margin as outdoor chillers, but the same water-quality rules apply. Flow rate per server rack is typically 3–5 L/min; pressures above 1.5 bar differential across the rack indicate microchannel blockage. Published data for this specific configuration are limited beyond field maintenance records.
The six-metal glassware corrosion test in ASTM D1384-18 is used as a release criterion for fully formulated coolants. Table 2 lists the maximum coupon mass-loss values that apply to RH-TMM-2 at 50 vol% in corrosive water containing 100 mg/kg each of sodium chloride, sodium sulfate, and sodium bicarbonate. Coupon position in the glassware rig influences results; low-flow zones near the bundle top can show higher aluminium mass loss than the average. Therefore, the supplier also controls reserve alkalinity and pH to limit aluminium attack under alkaline drift.
| Metal coupon | Maximum mass loss |
|---|---|
| Copper | 10 mg |
| Brass | 10 mg |
| Steel | 10 mg |
| Cast iron | 10 mg |
| Solder | 30 mg |
| Cast aluminium | 30 mg |
These values are the pass/fail maxima of ASTM D1384-18 for a 336 h exposure at 88 °C; they are not exhaustive for field performance. For aluminium heat-rejecting surfaces, ASTM D4340 provides a more severe aluminium heat-transfer corrosion evaluation. Published data for RH-TMM-2 under ASTM D4340 are limited; the manufacturer’s certificate states only conformance to the glassware test release limit. Where long-life service is required, the supplier’s maintenance schedule references ASTM D6210 for fully formulated glycol-based coolants and ASTM D2570 for simulated service corrosion testing. The product is not intended for open cooling towers or systems with continuous water replacement, because open systems require scale and biocide control outside the TMM-2 inhibitor envelope. Closed-loop charge expectations of 3–5 years are typical only when annual reserve-alkalinity and pH checks remain within release limits and when water top-up is kept below 5 % of charge volume per year; above this leakage rate, inhibitor depletion is accelerated by constant make-up water addition.
Silicate-based coolants form a glass-like passivation layer that protects aluminium and ferrous surfaces but can precipitate as silicate gel when mixed with hard water or when pH drops below 7.0. RH-TMM-2 does not rely on silicate; the organic acid portion buffers acid produced by glycol oxidation, and the azole component passivates copper and brass. Phosphate-based fluids provide ferrous surface passivation but can form calcium phosphate scale on heat-exchanger surfaces when make-up water hardness exceeds 100 mg/kg as CaCO₃; the phosphate-free formulation of RH-TMM-2 avoids that failure mode. Amine-based fluids may stabilise pH but can be aggressive to some fluorocarbon elastomer seals and are restricted in certain food-contact or indirect potable-water circuits; the product is formulated without amine according to the supplier’s disclosure and is not intended for potable-water contact.
Compared with propylene glycol coolants of equal freeze protection, ethylene glycol-based RH-TMM-2 exhibits lower viscosity at low temperature and higher heat-transfer coefficient at a given pumping power. At −20 °C, a 50 vol% propylene glycol solution has approximately twice the viscosity of the equivalent ethylene glycol solution; this increases pump energy and reduces turbulence in plate coolers. The trade-off is that ethylene glycol carries higher acute oral toxicity and requires stricter secondary containment than propylene glycol. The TMM-2 package is therefore selected where thermal performance and deposit control are the controlling constraints, not where low mammalian toxicity is the first requirement.
Material compatibility boundaries are specific: EPDM and hydrogenated nitrile seals are preferred; natural rubber, certain polyurethane elastomers, and unplasticised PVC should be avoided. The product should not be mixed with nitrite-containing additives, because nitrite can oxidise to nitrate and increase the risk of soldered-joint corrosion in mixed-metallurgy loops, nor with silicate drop-in inhibitors, because the resulting gel can block strainers and plate channels within 48 h. Waste coolant must be classified under local water-quality and waste-disposal rules; ethylene glycol is listed under REACH and may require segregated collection according to the site operating permit.
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