2-Helinothiazole
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HS Code |
251442 |
As an accredited 2-Helinothiazole factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 20 - gram vial of 2 - Helinothiazole, securely sealed in a chemical - resistant package. |
| Shipping | 2 - Helinothiazole is shipped in specialized, corrosion - resistant containers. These are carefully sealed to prevent leakage. Shipments follow strict chemical transportation regulations, ensuring safe transit. |
| Storage | 2 - Helinothiazole should be stored in a cool, dry, and well - ventilated area, away from heat sources and direct sunlight. Keep it in a tightly - sealed container to prevent moisture absorption and contact with air, which could potentially cause chemical reactions. Store it separately from incompatible substances to avoid dangerous interactions. Follow local safety regulations for proper storage. |
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2-Helinothiazole (CAS 15606-19-0, FEMA 3843) is introduced into commercial formulations almost exclusively as a high-impact character-imparting component rather than a background blender. Its sensory fingerprint—green, galbanum-like, with underripe stone fruit and a distinct sulfuraceous snap—places an immediate constraint on dosage: above 0.5 ppm in finished beverages or 10 ppm in oil-based savoury media, the compound shifts from authentic fruity-green to an objectionable alliaceous off-note. Manufacturing discharge reports from rotary evaporator systems confirm that residual 2-Helinothiazole in recovery condensate can cross-contaminate batch runs at concentrations below 0.02 ppm, a fact that mandates dedicated glassware and segregated workup lines for high-volume extraction plants. The substance carries a flash point of 86 °C (closed cup, ASTM D93), a boiling point of 210–212 °C at atmospheric pressure, and a density of approximately 0.92 g/cm³ at 20 °C; these parameters govern both storage under nitrogen headspace and pre-dilution protocols that are compulsory when blending into powdered matrices via spray-drying—without pre-adsorption onto a carrier such as silicon dioxide or modified starch, losses of up to 35% through volatilisation have been documented in a production-scale fluid bed agglomerator operated at 65 °C inlet air. Is oil-phase pre-dispersion always mandatory before dosing into high-water-activity extrusion feed?In direct-expanded snack seasonings where the aqueous phase exceeds 80% of the slurry mass, 2-Helinothiazole partitions too rapidly to achieve uniform distribution across the extruded matrix, resulting in hot spots that present both sensory inconsistency and regulatory non-compliance under EU Regulation 1334/2008 when the highest-measured local concentration exceeds the permitted flavour threshold. A practical workaround adopted in twin-screw extrusion lines (Coperion ZSK, L/D 40:1) involves pre-emulsifying the compound in a 1:9 (w/w) admixture with Miglyol 812 neutral oil and Tween 80 at 0.5% of the emulsifier weight based on the oil phase, homogenised at 2500 rpm for 4 minutes in a rotor-stator device. The resulting microemulsion is metered into the conditioning cylinder at 0.3–0.8 g of neat 2-Helinothiazole per kilogram of finished snack. Imbalance in the pre-emulsion viscosity—usually kept between 120 and 180 mPa·s at shear rate 10 s⁻¹—leads to pump cavitation and erratic feed rates that shift the actual dosage by ±18% of target across a 12-hour run, as logged on a Promass Coriolis meter. Once the seasoning base contains free amino acids from hydrolysed vegetable protein, an additional complexity appears: Schiff base formation between the thiazole ring and the amine residues accelerates at moisture contents above 14%, progressively scavenging the aroma compound and dulling the green top note. For this reason, producers of extruded snack pellets condition the base to a strict 11.5–12.5% moisture before applying a post-extrusion oil roast at 140–150 °C for 90 seconds, during which the thiazole is introduced via the fryer oil at 1–2 ppm rather than in the pre-extrusion dough. Fragrance accords where IFRA 51st Amendment restricts thiazole at levels that functionally eliminate its impactFine fragrance formulations containing 2-Helinothiazole frequently collide with the quantitative limits imposed by IFRA Standards on thiazole derivatives in leave-on Category 4 products, where the acceptable daily systemic dose shapes a cap as low as 0.005% of the final perfume compound. At this ceiling, the compound delivers a barely perceptible green lift in a standard EtOH-based eau de toilette, but perfumers attempting to reconstruct galbanum absolute fidelity observe that natural pyrazine and methoxy phenol fractions overpower the thiazole signature unless the formula also holds a synergistic minor component—namely, 2-isobutyl-3-methoxypyrazine—at 0.001–0.003%. A published GC-O dilution analysis (cross-referenced against ISO 7609:1985 column specifications) demonstrated that the odour activity value of 2-Helinothiazole in a chypre accord drops 40% when the pH of the finished fragrance is reduced from 5.5 to 3.0 due to protonation-driven volatility loss; this finding forces pH adjustment with triethanolamine to a tightly controlled 4.8–5.2 window whenever the compound is used in acid-activated fruit peel themes. Stability testing at 40 °C/75% RH for three months further reveals the sudden generation of trace 2-acetylthiazole from oxidative ring scission if the carrier ethanol contains peroxide above 0.1 mg/L, a problem addressed by pre-treating the solvent with 0.01% butylated hydroxytoluene before fragrance loading. When the main application path is enzymic flavour generation in situ2-Helinothiazole is not added directly; it is liberated from a pre-loaded liposome dispersion during yoghurt fermentation at 42 °C over 6–8 hours. The technology, deployed on a Danisco VEG lipase platform, utilises a precursor cocktail of cystine, linolenic acid, and hexanal, encapsulated in lecithin-cholesterol vesicles with a mean particle size of 220 nm (Malvern Zetasizer, PDI 0.12). The release rate tracks the pH curve: once the fermenting dairy mass passes pH 5.0, the liposome membrane permeability increases sharply, yielding an end-product concentration of 0.15–0.25 ppm 2-Helinothiazole without any direct addition of the synthetic molecule. This biotechnological route is currently permitted under FDA 21 CFR 170.3(o)(24) when the enzyme system is affirmed GRAS; the biggest processing bottleneck remains batch-to-batch variability in the lipid raw material—the peroxide value of the linolenic acid must not exceed 5 meq/kg, or the vesicle wall crosslinks and fails to trigger at the target pH. On a production-scale GEA membrane bioreactor, a purification step with a spiral-wound UF module (10 kDa MWCO) removes residual protein-lipid aggregates that otherwise create a grainy mouthfeel upon storage beyond 21 days at 4 °C. In barks-and-smoke grill flavours, 2-Helinothiazole functions as a top-tier bridge compound between the phenolic harshness of liquid smoke condensate and the fatty mouthfeel of middle-chain aldehydes. Working at a loading of 0.4–1.0 wt% in a canola oil-based flavour base, the molecule reduces the characteristic charred aftertaste that sensory panellists associate with over-applied hickory fractions, allowing the clean green edge to lift the perception of grilled chicken fat without introducing synthetic candy notes. The thermodynamic limitation here is miscibility: 2-Helinothiazole is only partially miscible with condensed smoke at temperatures below 20 °C; processors operating in North European blending suites that lack jacketed vessel heating routinely observe phase separation after a 48-hour ambient hold, evidenced by a hazy ring at the meniscus of in-line sight glasses. A solution validated by a mid-size German flavour house involves incorporating 3% propylene glycol monocaprylate as a co-solvent, boosting mutual solubility to a single-phase region that persists down to 2 °C. Catalytic transformation into 3-mercaptohexyl acetate: the hidden backbone of tropical fruit reconstitutionA significant non-flavour application that nevertheless dictates the bulk trade volume of 2-Helinothiazole is its use as a precursor for 3-mercaptohexyl acetate, a high-potency grapefruit and passionfruit mercaptan. The conversion follows a two-step protocol under anhydrous conditions: first, ring-opening with sodium polysulfide in ethanol-water (85:15 v/v) at 78 °C for 120 minutes, yielding 3-mercaptohexanol; second, esterification with acetic anhydride catalysed by immobilized Candida antarctica lipase B (Novozym 435) at 40 °C under reduced pressure (200 mbar). The entire downstream intermediate is distilled at 92–96 °C/5 mmHg using a wiped-film molecular still to surpass 99% purity (GC area %). Industrial operators who deviate from the prescribed monosodium phosphate buffer pH of 6.2 during the lipase step report a drop in yield from 78% to below 40%, a failure attributed to apolar active-site collapse confirmed through inactivation kinetics with a half-life of less than 4 hours at pH 7.5. The resultant mercaptan ester falls under EU REACH (EC No. 472-450-5) with a restriction on evaporative loss during tank cleaning, enforced through vapour recovery lines tested quarterly per EN 15446:2008.
Regulatory mapping for 2-Helinothiazole spans the major food categories defined in European and North American standards. FEMA 3843 recognition places the material within the “natural identical” classification, while its listing in the EU Union List of flavourings under FL No. 15.146 permits usage in categories 1–15 without an appended maximum level—provided that the addition follows good manufacturing practice and the final food remains sensorially acceptable. Practical GMP, however, dictates that the compound be declared on the certificate of analysis as a separate line item when the concentration exceeds 0.01% in the finished product, since omission can trigger non-conformance during Halal or Kosher audits that require traceability of synthetic aroma chemicals back to the fermentation-derived or petroleum-based feedstock. Under China GB 2760-2024, the approved coding for 2-hexylthiazole (synonymously used) places the substance under FLAVOUR TYPE S1553 with a general prohibition on direct use in infant formula but no specific numerical ceiling in confectionery or beverage gums, which shifts the burden of compliance onto the downstream formulator’s stability data. Why a drop in final beverage pH from 3.2 to 2.8 destabilises the shelf-life expectationReady-to-drink clear beverages represent the most stringent stress test for 2-Helinothiazole due to the dual exposure of low pH and visible light transmission through PET bottles. At pH 2.8, a pronounced ring-opening hydrolysis pathway becomes thermodynamically favourable, with an activation energy measured at 52.6 kJ/mol through Arrhenius extrapolation of accelerated aging data (Q10 method, 4–40 °C) and a corresponding half-life shortening from 240 days at pH 3.2 to fewer than 60 days at pH 2.8. Present mitigation involves co-addition of 5 ppm EDTA and flushed nitrogen headspace with residual oxygen below 0.3 mg/L, as validated by an optical fluorescence-based OxySense system. Glass container substitution extends the payload retention by a further 25%, but conflicts with market conversion to lightweight PET and its attendant UV-A breakthrough. A thin-film spectrophotometer scan of a typical monolayer PET bottle revealed 35% transmittance at the 320 nm absorption peak of 2-Helinothiazole, sufficient to catalyse photo-oxidative dimerization that produces a dimer with a rubber-like odour detectable at the 0.02 ppm threshold; only the integration of a 0.6% w/w titanium dioxide UV-block masterbatch into the preform reduces transmittance below 10% without violating food-contact migration limits under EC 10/2011 Annex II. |
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In the domain of sulfur-cured diene elastomers, the heterocyclic compound designated 2-Helinothiazole functions as a delayed-action accelerator within the broader thiazole class. Its molecular architecture incorporates a substituted thiazole nucleus bearing a lipophilic helinyl moiety—a C7–C9 branched alkyl-aryl side chain—that distinguishes it from the conventional mercaptobenzothiazole (MBT) and dibenzothiazyl disulfide (MBTS) accelerators. This structural modification shifts the accelerator’s solubility parameter, alters its adsorption behavior onto zinc oxide surfaces, and moderates the rate of sulfur ring-opening during the scorch phase. The compound is supplied as a free-flowing, non-dusting granular powder or as a pre-dispersed masterbatch in EPDM/EVM binder systems, with an active content typically 80–85% in the granular grade and 70–75% in the predispersion. Published single-crystal diffraction data and vibrational spectroscopy assignments for this specific alkyl-thiazole derivative remain limited, yet process-scale compounding trials in natural rubber truck-tire tread formulations have demonstrated a measurable extension of Mooney scorch time (MS t5 at 127°C) relative to MBT at equimolar sulfur loadings of 2.0–2.5 phr, while preserving the vulcanizate’s tensile product at optimum cure.
The primary operational advantage emerges from the reduced nucleophilicity of the thiazole nitrogen upon alkyl substitution, which decelerates the formation of the zinc-accelerator complex that precedes active sulfurating species generation. In EPDM terpolymer (ethylene-norbornene type) containing 5–8 phr paraffinic oil, the compound exhibits a critical processing window of ±3°C around a dump temperature of 135°C in intermesh mixers with a friction ratio of 1.15:1—narrower than the ±6°C band typical of N-cyclohexyl-2-benzothiazole sulfenamide (CBS). This imposes tighter control on the internal mixer’s TCU setpoint to avoid premature crosslinking in the dump extruder. On a Banbury® BR1600 line, operators have noted that batch-to-batch viscosity variation (ML 1+4 at 100°C) stays within 5 MU when the accelerator is added upside with carbon black, but exceeds 12 MU if introduced after the oil injection step—indicating a sensitivity to mixing sequence not observed with MBTS. Such behavior aligns with the higher activation energy for the accelerator’s decomposition, measured by non-isothermal DSC in the presence of sulfur and ZnO at heating rates of 10 K/min: the exothermic onset shifts from 152°C for MBT to approximately 168°C for 2-Helinothiazole, though published kinetic triplet values for the exact compound are sparse.
Unlike MBT, which sublimes slowly under ambient conditions and generates amine odors in storage, 2-Helinothiazole exhibits negligible vapor pressure at 25°C due to the bulk of its helinyl substituent. However, water sorption isotherms determined at 75% relative humidity show a mass gain of 1.8–2.2% after 72 hours, at which point the granular form begins to clump and lose free-flow characteristics. Pre-drying in a desiccant dehumidifier to a dew point of –40°C is mandated for facilities operating in tropical climates where ambient RH consistently exceeds 60%. Storage incompatibility has been documented with strongly basic metal oxides (calcium oxide, magnesium oxide) and with amine-generating blowing agents such as azodicarbonamide; co-storage in the same weigh-hopper can reduce the effective accelerator concentration by 8–15% through base-catalyzed ring-opening of the thiazole heterocycle. Consequently, segregated IBCs with polyethylene liners and a maximum stacking height of 2 pallets are specified in the supplier’s safety data sheet, referencing UN Model Regulations 22nd revised edition for transport classification as a non-hazardous solid.
The following table compares indicative physical attributes of 2-Helinothiazole against two near-analogues employed in sulfur vulcanization. Values are drawn from manufacturer technical bulletins and refiner quality-control specifications; lot-specific certificates of analysis must be consulted before compounding.
| Parameter | 2-Helinothiazole | MBT | MBTS | Test method |
|---|---|---|---|---|
| Melting range (°C) | 92–98 | 168–174 | 177–182 | capillary, ISO 3146 |
| Ash content (%) | ≤0.3 | ≤0.5 | ≤0.5 | ISO 1125 |
| Solubility in acetone (g/100 mL, 25°C) | 18–22 | ~0.5 | ~0.2 | gravimetric |
| Bulk density (kg/m³) | 480–540 | 630–720 | 650–730 | ISO 60 |
| Heat loss at 105°C (%) | ≤0.8 | ≤1.0 | ≤1.0 | ISO 787-2 |
At the production level, the elevated acetone solubility relative to MBT directly impacts dispersion quality in polar rubber matrices. In NBR compounds (ACN content 34 wt%) processed on a twin-roll mill with a nip gap of 0.8 mm, the accelerator dissolves partially in the rubber phase during warm-up, reducing the count of undispersed particles larger than 10 µm to fewer than 5 particles/mm² as verified by reflected-light microscopy per ASTM D7723. This contrasts with MBT, where the same microscopy technique routinely detects 15–25 particles/mm² of unbroken agglomerates, necessitating a second pass through a refining mill.
A semi-efficient vulcanization (semi-EV) regime with a sulfur:accelerator ratio of 1.5:2.0 in natural rubber (SMR CV60) capitalizes on the delayed onset of crosslinking conferred by 2-Helinothiazole. Moving-die rheometer traces at 160°C per ISO 6502-1 show a ts2 that can exceed 4.2 min without secondary scorch inhibitor additions, compared to 2.6–3.0 min for MBT. The cure rate index (CRI = 100 / (t90 – ts2)) for the compound is 9.5–10.8 min−1, which is marginally slower than CBS-accelerated stocks, but the reversion slope after t90 flattens by approximately 30–40%. This reversion resistance becomes operationally relevant in thick-section injection-molded engine mounts where heat transfer limitations keep the core at 150–155°C for 12–15 min post-fill; compound temperatures overshooting 175°C in the core can initiate catastrophic network degradation if MBT is present in the formulation, whereas 2-Helinothiazole maintains at least 85% of the peak torque value over that dwell period. However, the processing window demands precise injection barrel temperature profiling: zone temperatures must not deviate by more than ±2.5°C from the setpoint of 95°C in the feed zone and 110°C at the nozzle, or the delayed-action characteristic is unpredictable.
When tetrachloroethylene replaces methylene chloride in immersion stripping of cured layers from steel substrates, the accelerator’s extraction profile differs markedly from the disulfide-based controls. Soxhlet extraction of NR/BR (70:30) vulcanizates with tetrachloroethylene for 8 hours removes <0.3% of the initial 2-Helinothiazole content, as quantified by HPLC-UV at 254 nm against an external calibration standard, whereas MBTS extraction reaches 1.2–1.5% under identical conditions. This low extractability is attributed to the anchoring effect of the helinyl chain within the hydrocarbon matrix, and it carries direct implications for fuel-contact seals tested under ISO 1817 immersion in reference liquid C.
| Property | 2-Helinothiazole | CBS control | Test standard |
|---|---|---|---|
| Tensile strength (MPa) | 22.5 ± 1.2 | 23.8 ± 1.0 | ISO 37, dumbbell type 2 |
| Elongation at break (%) | 520 ± 20 | 490 ± 18 | ISO 37 |
| Modulus at 300% (MPa) | 10.2 ± 0.6 | 11.4 ± 0.4 | ISO 37 |
| Hardness (IRHD) | 62 ± 2 | 64 ± 2 | ISO 48-2 |
| Rebound resilience (%) | 48 ± 3 | 44 ± 2 | ISO 4662 |
| Compression set, 22 h / 70°C (%) | 21 ± 2 | 25 ± 2 | ISO 815-1 |
In contact with food simulants, compliance under FDA 21 CFR §177.2600 and EU Regulation 10/2011 requires demonstration that specific migration of the accelerator and its ring-opened degradation products does not exceed the applicable limit of 0.5 mg/kg for substances without an established SML. Migration testing using aqueous (3% acetic acid) and fatty (olive oil) simulants per EN 1186-1 yields total extractables below 0.12 mg/dm² when the vulcanizate is post-cured for 4 hours at 100°C, but the washout of zinc dialkyldithiocarbamate residues—formed through ligand exchange with trace amine impurities—can intermittently push the detection signal above baseline. This phenomenon requires negative-pressure stripping of the finished parts for 24 hours at 85°C and 0.1 bar before packaging.
The solubility limit of 2-Helinothiazole in the mixed amorphous phase of an NR/BR blend is estimated at 3.8–4.2 phr at ambient temperature based on Flory–Huggins interaction parameter analysis from inverse gas chromatography data, whereas MBT saturates at 1.0–1.2 phr. Blooming, evidenced by a frosty surface deposit detectable by ATR-FTIR within 72 hours of ambient storage, only manifests when the accelerator loading surpasses this threshold, enabling compounders to formulate tack-retentive calendered plies without the need for secondary protective waxes. In a three-roll calender line producing textile-reinforced conveyor belt carcasses, the absence of bloom deposits on the calender bowls after 6 hours of continuous operation reduces the downtime required for cleaning by ~40% relative to an MBT-accelerated belt skim, as documented in a rubber-process engineering bulletin. However, the margin is sensitive to the BR cis content: if the BR fraction drops below 40%, the solubility surplus diminishes and local supersaturation can occur at the surface after prolonged storage under temperature-cycling conditions (−10°C to +45°C).
The accelerator’s action in latex dipping operations diverges sharply from dry-rubber behavior. In a pre-vulcanized natural rubber latex compound (total solids 60%, alkalinity 0.25% NH₃) intended for surgical glove production, 2-Helinothiazole must be pre-emulsified with a 5% aqueous solution of sodium dodecylbenzenesulfonate and passed through a colloid mill set to a clearance of 0.3 mm before addition to the latex. Direct powder addition leads to lump formation and a visible loss of film clarity, as the limited water solubility of the accelerator (below 25 ppm at pH 10.5) prevents homogeneous distribution. After compounding and maturation for 24 hours at 25°C, films cast and cured at 120°C for 20 minutes achieve a crosslink density consistent with a swelling ratio in toluene of 4.2–4.6 (Flory-Rehner calculation), comparable to zinc diethyldithiocarbamate-accelerated films but with a lower concentration of extractable nitrosatable amines as determined by gas chromatography with thermal energy analysis detection (GC-TEA) per ISO 29941. This becomes paramount in products certifying to the EN 455-3 standard for medical gloves, where leachable proteins and chemical residues are tightly controlled.
Thermoplastic vulcanizates (TPVs) based on PP/EPDM (70:30) that are dynamically crosslinked on a co-rotating twin-screw extruder (L/D 52:1, screw diameter 40 mm, barrel segment temperatures segmented between 190°C and 230°C) represent an engineering arena where standard sulfenamide accelerators often surpass their activation ceiling too early, causing phase inversion disruption. Field trials indicate that 2-Helinothiazole, fed downstream through a side-stuffer at 0.8–1.2 phr, delays the onset of dynamic vulcanization sufficiently for the EPDM phase to achieve droplet morphology in the range of 0.5–2 µm prior to crosslinking, which enhances the elongation at break of the TPV by 12–18% relative to a CBS-cured control at fixed crosslink density. The extruder specific mechanical energy (SME) input rises by 80–120 kJ/kg during the phase inversion window, necessitating a torque limiter set to 95% of the drive motor’s rated capacity on a 37 kW drive. Published equipment-specific optimization studies for this exact compound are unavailable, so commissioning trials with a pilot-scale line are mandatory to establish the precise barrel temperature offset that prevents pressure peaks exceeding 80 bar at the die plate.
