Lubricant Additives - Friction Modifiers / AW–EP Series: Triethylene Glycol Methyl Ether Borate (TEGMEB, CAS 30989-05-0) introduces a fundamentally different chemistry to the Sinolook FM range - the borate ester class. Unlike the organomolybdenum FM grades (MoDTP, MoDTC, Mo Amine Complex) which work through metal-surface tribofilm deposition, TEGMEB operates through boron tribochemistry: the B–O–C ester bonds thermally and tribologically decompose at contact surfaces, releasing reactive boron species that form: (1) a B₂O₃ low-melting-point glass film (MP ~450°C, low shear strength - boundary lubrication FM mechanism); (2) iron boride (FeB, Fe₂B) EP reaction film under extreme-pressure conditions; (3) in water-based metalworking fluids, hydrolysis produces boric acid (H₃BO₃) - a natural, non-toxic boundary lubricant that provides excellent lubricity in water-based and semi-synthetic MWF systems. TEGMEB is completely sulphur-free and phosphorus-free - its only heteroatom is boron (B, 4.5–5.5 wt%). This makes it the premier EP/AW additive for: water-based MWF (where S-P actives are often restricted), aluminium/magnesium alloy machining (S-P corrosion risk), and S-P free industrial lubricant formulations. Sinolook Borate Ester Series: TEGMEB CAS 30989-05-0 (this) · other borate ester grades.
✅ ZERO SULPHUR · ZERO PHOSPHORUS · Borate Ester · B 4.5–5.5% · B₂O₃ + H₃BO₃ + FeB Tribochemistry · FP ≥160°C · PP ≤–15°C · Water-Based MWF · Al/Mg Machining · EP + AW + FM · Brake Fluid · CAS 30989-05-0
Triethylene Glycol Methyl Ether Borate (TEGMEB)
TEGMEB / Tris(triethylene glycol monomethyl ether) borate / Glycol Ether Borate Ester / 三乙二醇甲醚硼酸酯 / CAS 30989-05-0 / B 4.5–5.5% / Zero S · Zero P / Colourless–Light Yellow Liquid
| CAS Number | 30989-05-0 |
| Full name | Tris[2-(2-methoxyethoxy)ethyl] borate / B[O–CH₂CH₂–O–CH₂CH₂–O–CH₃]₃. Three triethylene glycol monomethyl ether (TEGME) chains are esterified to a single boron atom through B–O–C borate ester bonds. MW ~504 g/mol (three C₇H₁₅O₃ chains + B) |
| Structure | Trigonal planar boron (sp² B) at centre, bonded to three –O–CH₂CH₂–O–CH₂CH₂–O–CH₃ chains. The B–O bond (BDE ~519 kJ/mol) is the tribochemically active bond - cleavage releases the B(OH)₃/B₂O₃ lubricating species. The ether chain (–O–CH₂CH₂–O–) imparts water miscibility and low viscosity. As shown in image: skeletal formula CH₃–O–CH₂CH₂O–CH₂CH₂O (one of three TEGME chains) attached to central B. 3D model: green = B (central boron atom, distinctively large and green); red = O (ether and borate ester oxygens); black = C; white = H. No yellow, no grey - confirming zero S, zero Mo, zero P. |
| ★ Unique properties | Three-in-one tribochemistry: B₂O₃ glass film (FM at moderate temp) + FeB/Fe₂B EP film (EP at high pressure) + H₃BO₃ hydrolysis (FM in water-based MWF). Only heteroatom = B. Zero S, zero P, zero N, zero metals. Non-corrosive to copper (D130 1a). Water-miscible (ether chain). Hydrolysis-sensitive - strict water control required. |
| ★★ SAPS Status |
⚠ B = 4.5–5.5% - boron contributes minor sulphated ash (B₂O₃) ✅ S = 0% - ZERO SULPHUR ✅ P = 0% - ZERO PHOSPHORUS
Note on Boron and SAPS: B is not explicitly listed in ACEA's SAPS acronym (Sulphated Ash, Phosphorus, Sulphur). However, B₂O₃ does contribute to sulphated ash measured by ASTM D482. At 0.5–2.0 wt% TEGMEB treat rate, B contribution to ash = ~0.03–0.13% - significant in ACEA C1 (ash ≤0.5%) formulations at high treat rates. Use at ≤1.0 wt% in ACEA C1/C2 engine oil; freely at any rate in industrial lubricants and MWF where no ash limit applies. |
| ★ Water sensitivity | ⚠ HYDROLYSIS SENSITIVE - water ≤0.10% in neat product
B–O–C bonds hydrolyse: B(OR)₃ + 3H₂O → B(OH)₃ + 3ROH (boric acid + TEGME alcohol). Rate increases with temperature and pH >7. In storage: sealed containers essential; water ≤0.10% (KFT spec). In water-based MWF: controlled hydrolysis is desired - boric acid product provides boundary lubrication. In oil-based lubricants: minimise moisture to prevent premature hydrolysis and emulsion haze. |
| Appearance | Colourless to light yellow transparent liquid; clean, low odour (ether/ester note); no visible haze or particulates. Note: pale yellow tint acceptable; any brown colour or turbidity may indicate partial hydrolysis - re-test water content. |
TEGMEB Tribochemistry - Three Boron-Based Protective Film Mechanisms
Triethylene Glycol Methyl Ether Borate (TEGMEB) operates through a unique three-pathway boron tribochemistry that is entirely distinct from all other additive classes in the Sinolook range. Where ZDDP relies on zinc polyphosphate glass, MoDTC/MoDTP on MoS₂ lamellar crystals, and phenolic/amine AOs on radical scavenging - TEGMEB forms its protective effects through boron-based surface chemistry: the decomposition of B–O–C ester bonds under tribological and thermal activation releases boron species that interact with metal surfaces and the lubricant environment through three complementary pathways, each activated at different temperatures and conditions.
At contact temperatures above 80°C, B–O–C ester bonds in TEGMEB undergo thermolysis and tribochemical cleavage. The released boron (as B(OH)₃ or B₂O₃ precursor species) condenses on metal surfaces to form an amorphous B₂O₃ glass film (boron trioxide, melting point ~450°C, significantly above typical lubricant operating temperatures). B₂O₃ in its glassy state is a viscoplastic solid lubricant at operating temperatures - its glassy rheology allows the film to flow and self-heal under tribological contact while maintaining low shear strength.
Glassy B₂O₃ shear strength at 100–200°C is approximately 20–50 MPa - significantly lower than steel-on-steel contact stress (>1 GPa) but sufficient to support load. The B₂O₃ film acts as a boundary lubricant in mixed/boundary lubrication regimes, reducing metal-to-metal contact and decreasing friction coefficient by 30–50% vs unlubricated contact. B₂O₃ is non-crystalline (unlike MoS₂ which relies on lamellar crystal planes) - its amorphous nature allows it to conform to irregular surface topographies, giving good lubrication even on rough surfaces.
Under extreme-pressure conditions (asperity contact stress >1 GPa, local temperature >200–300°C), reactive boron species from TEGMEB decomposition chemically react with the iron/steel contact surface: Fe + B → FeB (orthorhombic) or Fe₂B (tetragonal). These iron boride compounds are extremely hard (FeB: ~1800 HV; Fe₂B: ~1400 HV - harder than iron at ~80 HV) and form a thin (<100 nm) but highly load-bearing reaction layer on the steel surface. This EP mechanism is analogous to the iron sulphide (FeS) film formed by sulphur-EP additives but without sulphur - providing equivalent or superior EP protection with zero sulphur chemistry.
Critical advantage of boride EP over sulphide EP: FeB/Fe₂B films do not corrode copper or yellow metals (ASTM D130 copper strip test: TEGMEB typically gives 1a–1b, non-corrosive). Sulphur-EP additives (sulphurised esters, active sulphur compounds) are inherently copper-corrosive (D130 3c–4c) - requiring additional copper deactivator additives. TEGMEB provides EP protection with zero copper corrosion contribution, making it ideal for gear oils and hydraulic fluids in systems containing copper/brass components (hydraulic pump components, gear oil sumps with bronze bushings).
In water-based metalworking fluids (semi-synthetic, full-synthetic MWF), TEGMEB undergoes controlled hydrolysis: B(OR)₃ + 3H₂O → B(OH)₃ (boric acid, H₃BO₃) + 3 TEGME alcohol. Boric acid is a natural, environmentally benign mineral that forms lamellar crystals (triclinic, layer structure with B–OH···OH hydrogen bonding between layers) similar in lubrication concept to graphite or MoS₂. H₃BO₃ layers slide over each other with low shear force, providing boundary lubrication at tool/workpiece contacts in cutting, grinding, and drawing operations.
Unlike sulphur-phosphorus EP additives in water-based MWF, boric acid H₃BO₃ is: non-toxic (LD50 (oral, rat) ~3450 mg/kg - comparable to table salt); non-biocidal (does not kill microorganisms at MWF use concentrations - preserves MWF longevity with standard biocide regimen); emulsion-stable (does not cause emulsion breaking in oil-in-water MWF systems); non-foaming (TEGMEB ether chain suppresses foam generation). These properties make TEGMEB-derived boric acid lubrication the premier approach for high-performance water-based MWF applications where non-toxicity and emulsion stability are simultaneously required.
| Criterion | S-P EP (sulphurised ester / ZDDP) | ★ TEGMEB (Borate Ester) |
|---|---|---|
| Sulphur content | High (8–40%) | ✅ 0% - Zero |
| Phosphorus content | 0–5% (ZDDP: ~10%) | ✅ 0% - Zero |
| ★ Copper corrosion (D130) | 3c–4c (corrosive) | ★ 1a–1b (non-corrosive) |
| Al/Mg alloy compatibility | S staining risk | ★ No staining - safe |
| Water-based MWF use | Limited (emulsion issues) | ★★ Excellent (H₃BO₃ lubrication) |
| Environmental / toxicity | Moderate concern | ★ Lower concern (boric acid product) |
| EP film hardness | FeS: ~700 HV | FeB: ~1800 HV (harder) |
| Appearance | Colourless to light yellow transparent liquid |
| ★ B content | 4.5–5.5 wt% (typical 5.0%) |
| ★ S content | 0% - Zero sulphur |
| ★ P content | 0% - Zero phosphorus |
| Density @20°C | 1.02–1.05 g/cm³ |
| Flash Point (COC) | ≥ 160°C |
| ★ Pour Point | ≤ –15°C |
| ⚠ Water content | ≤ 0.10% (KFT) |
| Refractive index @20°C | 1.420–1.430 |
| Shelf life | 24 months (sealed, 5–30°C) |
Technical Specification
Typical 5.0%. Primary performance index. Higher B = more B₂O₃/FeB/H₃BO₃ film-forming potential. Specify target B% on order.
Zero sulphur, zero phosphorus - EP protection without S/P chemistry. Non-corrosive (D130 1a–1b). Compatible with Al/Mg/Cu alloys without staining.
Slightly denser than mineral oil (~0.85–0.88). Excellent miscibility confirmed by visual blending test - no phase separation at any treat rate in Group I–III mineral or PAO base oil.
Excellent low-temp fluidity - better than Mo Amine Complex (≤–5°C) and MoDTC (≤–10°C). Critical for cold-climate gear oil and hydraulic oil blending.
Rapid in-line QC tool. Out-of-range nD indicates off-spec composition or partial hydrolysis. Verify with ICP B content if nD anomalous.
| Parameter | Specification | Test Method | Technical Note |
|---|---|---|---|
| Appearance | Colourless to light yellow liquid | Visual / D156 | Clear, transparent, no particulates. Light yellow tint (Saybolt colour ≥+20) acceptable. Brown/turbid = possible hydrolysis - verify KFT water content immediately. |
| ★ Boron Content | 4.5–5.5 wt% (typ. 5.0%) | ICP-OES / titrimetric | Primary performance index. Determines B₂O₃ film capacity and H₃BO₃ yield on hydrolysis. Specify target B% at order - lot COA reports ICP-B value. |
| ★ S Content | 0% | ASTM D4294 / ICP | Zero sulphur - no S atom in TEGMEB structure. Critical for: Al/Mg machining (S staining avoidance); copper-compatible formulations (D130 1a); S-free industrial lubricants; water-based MWF (S-P compatibility issues avoided). |
| ★ P Content | 0% | ICP-OES | Zero phosphorus. ACEA P-limit compliant at any treat rate (P contribution = 0). Conserves full P budget for ZDDP in engine oil applications. |
| Density @20°C | 1.02–1.05 g/cm³ | ASTM D4052 | Higher density than mineral oil - stirring/mixing recommended when blending into base oil. Confirmed miscible; no stratification in any mineral or PAO blend. |
| Flash Point (COC) | ≥ 160°C | ASTM D92 (COC) | Non-flammable (GHS FP >60°C); no ADR Class 3. Note: COC method is open-cup, typically 15–20°C higher than PM (closed-cup) equivalent. |
| ★ Pour Point | ≤ –15°C | ASTM D97 | Excellent cold-flow: best PP of all Sinolook FM/AW additives (≤–15°C vs MoDTP ≤–10°C, Mo Amine Complex ≤–5°C). Enables use in cold-climate gear oil and hydraulic oil blending without pre-heating the additive. |
| ⚠ Water Content | ≤ 0.10% | Karl Fischer | Critical spec - B–O–C bond hydrolysis begins at water >0.1%. Sealed storage essential. Re-test after opening. Use N₂ blanket for IBCs. Any turbidity or colour change in stored product: immediately test KFT; if water >0.1%, assess B content to confirm no significant degradation. |
| Refractive Index @20°C | 1.420–1.430 | ASTM D1218 | Rapid QC tool: can be measured in 30 seconds with a refractometer. Out-of-spec nD typically indicates off-spec composition or hydrolysis. Recommended as incoming QC check. |
| Packaging | 200 kg drum (metal/HDPE) · 1000 L IBC | - | 24-month shelf life sealed at 5–30°C. Sealed storage critical for hydrolysis prevention. N₂ blanket for open IBCs. |
Applications & Dosage Guidance
1. Metalworking Fluids - The Primary Application
TEGMEB is most widely used in metalworking fluids (MWF) - particularly in water-based (semi-synthetic and synthetic) cutting, grinding, honing, and drawing fluids. In water-based MWF (typical dilution 3–10% in water), TEGMEB at 0.5–2.0 wt% of concentrate provides EP and lubricity through its hydrolysis pathway: the B–O–C bonds hydrolyse at MWF operating pH (7.5–9.5) and temperature (20–60°C), releasing H₃BO₃ which adsorbs on metal surfaces as a boundary lubricant. The TEGME alcohol co-product is water-soluble and does not affect emulsion stability. For oil-based MWF (neat cutting oil, stamping oil), TEGMEB at 1.0–3.0 wt% provides EP protection via B₂O₃ film and FeB reaction layer without sulphur chemistry - critical for aluminium alloy machining (Al, Mg, Ti), where sulphur-active EP compounds cause black staining on workpieces. TEGMEB at these treat rates in aluminium cutting oil gives ASTM D2783 four-ball EP Weld Load of 126–160 kg (vs 63 kg for uninhibited mineral oil) with zero workpiece discolouration.
2. Brake Fluids - DOT 3/4/5.1 Glycol Ether Base
TEGMEB's glycol ether structure (triethylene glycol monomethyl ether chains) is chemically compatible with polyglycol-based automotive brake fluids (DOT 3, DOT 4, DOT 5.1 per FMVSS 116). As a borate ester of TEGME, TEGMEB can serve as a performance-enhancing additive component in brake fluid formulations - the B–O–C borate functionality provides mild anti-corrosion protection for brake system metal components (steel, cast iron, aluminium callipers, copper brake lines) and improves the high-temperature stability of the glycol ether base fluid. At recommended treat rates, TEGMEB maintains compliance with DOT specifications including wet and dry equilibrium reflux boiling point (ERBP) requirements and kinematic viscosity limits at –40°C and 100°C. The zero-sulphur, zero-phosphorus composition ensures no contribution to rubber seal swell or incompatibility with EPDM and SBR brake system seals.
3. Industrial Gear Oils & Hydraulic Fluids
In industrial gear oils (DIN 51517-3 CLP, AGMA 9005-F16) and hydraulic fluids (DIN 51524-2/3 HLP, ISO VG 32–150), TEGMEB at 0.3–1.5 wt% provides EP/AW protection through B₂O₃ glass film and FeB tribochemical reaction layer, supplementing or partially replacing sulphur-phosphorus EP additives. The key advantage is the non-corrosive copper rating (ASTM D130 1a–1b) - gear oil sumps and hydraulic systems often contain bronze bushings, copper gaskets, and brass fittings that are attacked by active-sulphur EP additives. TEGMEB provides equivalent EP load-carrying capacity (ASTM D2783 Weld Load comparisons) without copper corrosion risk, eliminating the need for copper deactivator additives. For food-grade adjacent (H2 category) gear oils, TEGMEB's lower ecotoxicity vs S-P EP compounds (combined with its non-corrosive, non-staining characteristics) makes it a preferred EP additive component. Verify specific H2 status with regulatory consultant.
4. Engine Oils & Compressor Oils
In automotive engine oils (ACEA C1/C2/C3, API SP), TEGMEB at 0.2–0.5 wt% contributes AW/EP protection without phosphorus - conserving the P budget entirely for ZDDP anti-wear. At 0.5 wt% treat, B contributes ~0.025–0.028% to sulphated ash (from B₂O₃ formation in ASTM D482 test conditions) - acceptably within ACEA C1 (ash ≤0.5%) and C3 (ash ≤0.8%) limits at this treat rate. For ACEA C1 at higher treat rates (0.5–1.0 wt%), calculate total ash: TEGMEB B-derived ash + ZDDP Zn-derived ash must remain ≤0.5%. In compressor oils (DIN 51506 VDL, ISO 6521), TEGMEB's B₂O₃ film mechanism is particularly effective in rotary screw and vane compressors where piston ring/cylinder wall contact under high discharge pressures requires EP/AW protection - the non-sulphur EP avoids sulphur-related discharge valve deposits.
| Application | Treat Rate (wt%) | S / P in oil | Key Benefit / Standard |
|---|---|---|---|
| Water-based MWF (semi-synthetic / synthetic) | 0.5–2.0 | S=0% P=0% ✅ | H₃BO₃ hydrolysis lubrication; non-toxic; emulsion-stable; D130 1a; Al/Mg safe; best MWF application |
| Neat/oil-based MWF - Al/Mg/Ti machining | 1.0–3.0 | S=0% P=0% ✅ | Zero S staining on Al/Mg; D2783 Weld Load 126–160 kg; non-corrosive Cu; aerospace material compatible |
| Brake fluid (DOT 3/4/5.1 glycol ether base) | Component | S=0% P=0% ✅ | TEGME structural compatibility; anti-corrosion for brake metals; EPDM/SBR seal compatible; FMVSS 116 DOT 3/4/5.1 |
| Industrial gear oil (S-P free / food-adjacent) | 0.5–1.5 | S=0% P=0% ✅ | FeB EP film; D130 1a non-corrosive Cu; bronze/brass system safe; DIN 51517-3 CLP P-free variant |
| Hydraulic oil (non-corrosive EP) | 0.3–1.0 | S=0% P=0% ✅ | DIN 51524-2/3 HLP; Denison HF-0 (copper corrosion critical); pump AW/EP protection without S/P |
| Engine / compressor oil (ACEA C1–C3 EP supplement) | 0.2–0.5 | S=0% P=0% ✅ | AW supplement to ZDDP (no P addition); monitor B-derived ash at 0.5 wt%: ~0.025–0.028% ash contribution; ACEA C1 ash ≤0.5% allows up to ~1.0 wt% TEGMEB |
Frequently Asked Questions
Q: TEGMEB is described as "hydrolysis-sensitive." Is it safe to use in water-based metalworking fluids?
The hydrolysis of TEGMEB in water-based MWF is not a problem - it is the intended performance mechanism. When TEGMEB contacts water in MWF systems, the B–O–C bonds hydrolise to form boric acid (H₃BO₃) and TEGME alcohol. Boric acid is the actual boundary lubricant that adsorbs on metal surfaces in the MWF system. This hydrolysis must be distinguished from storage degradation (where premature hydrolysis before use reduces B content in the neat product - hence the strict water ≤0.10% spec for neat TEGMEB). In use, the controlled hydrolysis rate in MWF (governed by pH 7.5–9.5 and temperature 20–60°C) provides a sustained supply of H₃BO₃ lubrication throughout the MWF operating life. The TEGME alcohol byproduct is water-soluble, non-toxic, and does not affect emulsion stability or biocide performance. Monitoring MWF B content by ICP or boric acid titration over time allows the MWF operator to track when TEGMEB has been consumed and requires replenishment. Typical MWF replenishment schedule: top-up with TEGMEB concentrate every 2–4 weeks depending on machining intensity and water dilution ratio.
Q: Does boron (B) count toward the SAPS limits in ACEA engine oil specifications?
Boron is not explicitly listed in the ACEA SAPS acronym (Sulphated Ash, Phosphorus, Sulphur). However, boron does contribute to sulphated ash (ASTM D482) because during the D482 ash determination procedure, boron is oxidised to B₂O₃ which remains in the ash residue. At 0.5 wt% TEGMEB (B = 5.0%), B-derived ash contribution = approximately 0.5 × 0.05 × (B₂O₃/2B ratio = 69.6/21.6 = 3.22) × B fraction ≈ 0.025% sulphated ash. At 1.0 wt% treat: ~0.050% ash; at 2.0 wt%: ~0.10% ash. ACEA C1 limit is 0.5% sulphated ash - so TEGMEB can be used at up to ~1.0 wt% in ACEA C1 engine oil formulations before the B-derived ash becomes significant relative to the limit (assuming ZDDP and detergent contributions are also present). In industrial lubricants and MWF with no ash limit, this is entirely irrelevant. Always calculate total formulation sulphated ash including TEGMEB, ZDDP, and detergent contributions when formulating for ACEA ash-limited specifications.
Q: Can TEGMEB fully replace ZDDP or sulphur-phosphorus EP additives?
TEGMEB is not designed as a full replacement for ZDDP or S-P EP additives in most lubricant applications - it is optimally used as a complement or partial replacement: (1) Water-based MWF: TEGMEB can be used as the primary EP/lubricity additive, effectively replacing S-P EP compounds in this application - the H₃BO₃ mechanism is well-proven for cutting, grinding, and drawing operations, and the non-toxic, copper-safe profile is a genuine advantage. (2) Oil-based lubricants: TEGMEB at 0.3–1.0 wt% supplements ZDDP (0.5–0.8 wt%) - together they provide better AW+EP+FM performance than either alone, while allowing the ZDDP treat rate (and P contribution) to be reduced. This is the optimal P-reduction strategy: TEGMEB handles some EP function while ZDDP handles ROOH decomposition (secondary AO) and primary AW. (3) S-P free specifications (Al/Mg MWF, food-adjacent H2, zero-sulphur copper-safe): TEGMEB is the primary EP additive - used at higher treat rates (1.0–3.0 wt%) to achieve the required EP protection without S/P chemistry. Contact Sinolook with your specific application and target tribological performance for a treat rate recommendation and blend compatibility testing.
Technical & Regulatory References
ICP-OES D5185 (B content, S=0 confirmed, P=0 confirmed) · ASTM D92 COC (FP ≥160°C) · ASTM D97 (PP ≤–15°C) · ASTM D4052 (density 1.02–1.05 g/cm³) · KFT (water ≤0.10%) · ASTM D1218 (refractive index 1.420–1.430) · ASTM D2783 Four-Ball EP (Weld Load / Load Wear Index) · ASTM D4172 Four-Ball Wear (WSD - anti-wear) · ASTM D130 (copper corrosion - target 1a–1b) · ASTM D6138 (DGMK micropitting) · MWF-specific: IP 287 (emulsion stability) · ISO 11158 (MWF lubricity) · ASTM D3233 (Falex pin-and-vee EP) · Boric acid titration (MWF B content monitoring)
MWF (primary): ISO 6743-7 MH (neat cutting) · ISO 6743-7 MAC (semi-synthetic) · DIN 51385 · Tap water / hard water test (ISO 23783) · Brake fluid: FMVSS 116 DOT 3/4/5.1 · SAE J1703 / J1704 · ISO 4925 · Gear oil: DIN 51517-3 CLP · AGMA 9005-F16 · ISO 12925-1 (zero-S variant) · Hydraulic: DIN 51524-2/3 HLP · ISO 4406 · Denison HF-0/2 (D130 1a required) · Engine oil: ACEA C1–C3 (ash contribution ≤0.5% total) · API SP · Food-adjacent: NSF H2 (verify per application) · EU Reg. EC 1935/2004 adjacent
CAS 30989-05-0 · EINECS registered · REACH compliant · TSCA listed · ✅ S = 0% (confirmed) · ✅ P = 0% (confirmed) · ⚠ B = 4.5–5.5% → minor sulphated ash contribution (B₂O₃); calculate at treat rate for ACEA compliance · FP ≥160°C COC - non-flammable; no ADR Class 3 · GHS SDS: GHS07 (mild irritant - eye/skin irritant, similar to glycol ether class; standard PPE: gloves, goggles; avoid inhalation of vapour/mist; boric acid hydrolysis product is low acute toxicity) · Note: boric acid (H₃BO₃, hydrolysis product) is SVHC candidate under REACH for reproductive toxicity (Category 1B) - confirm MWF sump concentration of H₃BO₃ for worker exposure assessment in prolonged water-based MWF skin contact scenarios · 24-month shelf life sealed at 5–30°C
FM/AW/EP Additives: MoDTP (FM+AW+AO) ✅ · MoDTC (FM, zero P) ✅ · Mo Amine Complex (AO+FM, zero S+P) ✅ · TEGMEB CAS 30989-05-0 ✅ (this) - Borate Ester EP+AW+FM, zero S+P → ZDDP AW/AO ✅: Full range → Phenolic AO ✅: BHT · DTBP · HP-136/L01/L57 → Amine AO ✅: ADPA · NDPA → Detergents/Dispersants ✅
TEGMEB · CAS 30989-05-0 · B 4.5–5.5% · S=0% · P=0% · FP ≥160°C · PP ≤–15°C · Water ≤0.10% · Density 1.02–1.05 g/cm³ · nD 1.420–1.430 · Zero S/P · 200 kg Drum / IBC · 24-Month Shelf Life
Request Pricing, Formulation Guidance & Technical Support
Specify application (water-based MWF, oil-based neat cutting oil, brake fluid, gear oil, hydraulic oil, engine oil), workpiece material (steel, Al, Mg, Ti, Cu), target EP performance (ASTM D2783 Weld Load target), and SAPS constraints. We provide: lot COA with ICP B content and zero-S/P confirmation; EP screening data (D2783 and D4172 four-ball at specified treat rates); MWF H₃BO₃ hydrolysis rate data; compatibility assessment with co-additives (ZDDP, Mo FM grades, emulsifiers). Samples (100–500 mL) for formulation trials and D130/D2783 testing.
Borate Ester EP/AW/FM Series & Full Additive Range:
TEGMEB CAS 30989-05-0 ✅ (this) - Zero S/P Borate EP → Mo FM: MoDTP · MoDTC · Mo Amine Complex ✅ → ZDDP ✅ · Phenolic AO ✅ · Amine AO ✅ · Detergents ✅
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