Products›Coupling Agents›Silane (KH Series)
Silane Coupling Agents: SEMITECH KH Series Supplier — Silquest A, Dynasylan and Evonik Si-69/75 Equivalents from China
SEMITECH supplies 8 silane coupling agent grades chemically identical to Silquest A-series, Dynasylan and Evonik Si-69/75, manufactured in Zhejiang and Shandong with 2–4 week ex-China lead times.
Contents
| 8 | 2–4 wk | 30–45% |
|---|---|---|
| Active grades in portfolio | Ex-China lead time | Typical price gap vs Western distributor |
Silane Supply Chain: KH Naming, Silquest/Dynasylan/Evonik Producers
Three Western producers (Dow/Silquest, Evonik/Dynasylan, Shin-Etsu/KBM) define the molecules — Chinese KH naming maps directly to all of them at 30–45% lower landed cost.
The global silane coupling agent market is led by three Western producers — Dow (operating the Momentive Silquest A-series after the 2020 acquisition), Evonik (Dynasylan brand and the Si-69/Si-75 tire-silane franchise), and Shin-Etsu (KBM/KBE series in Japan and Korea). Chinese factories supply the same molecules under the standardized KH-xxx industry nomenclature: KH-550, KH-560, KH-570, KH-580 and KH-792 are universally recognized internal codes that buyers, formulators, and TDS sheets reference interchangeably with Silquest A-1100, A-187, A-174, A-189 and A-1120. SEMITECH manufactures from a Zhejiang and Shandong production base with chlorosilane and trichlorosilane feedstock supply integrated upstream — the structural cost advantage that drives the 30–45% landed-cost gap to Western distributor list pricing.
Application Coverage: Glass Fiber, Tire Rubber, Coatings
Glass fiber and reinforced plastics, tire and silica-filled rubber, coatings/adhesives/sealants — three demand-dominant clusters covered by the 8-grade SEMITECH portfolio.
Silane coupling agents bridge inorganic filler and fiber surfaces to organic polymer matrices. SEMITECH’s 8-grade portfolio covers the three demand-dominant clusters with overlap by application:
- Glass fiber and reinforced plastics — KH-550 for unsaturated polyester / epoxy / phenolic; KH-792 for nylon 6/6 and PBT (10–15% higher tensile retention than KH-550 at equivalent loading); KH-560 for epoxy systems; KH-570 for vinyl ester. Typical fiber-sizing dosage 0.5–1.5%, fiber tensile retention >90% after coupling.
- Tire and silica-filled rubber — Si-69 (TESPT) for PCR green tire tread at 5–10% on silica, delivering hysteresis reduction of 15–25% versus carbon-black baseline and rolling-resistance gains in line with EU tire labeling B/A grades. Si-75 (TESPD) for TBR (truck/bus radial) tread and retread compounds where lower scorch risk above 150°C is the binding constraint.
- Coatings, adhesives, sealants, cable — KH-580 (mercaptosilane) for sulfur-cure rubber and metal/glass adhesion in sealants; A-171 (VTMO) for silane-grafted XLPE in MV power cable insulation and peroxide-cure rubber; KH-792 for water-based coatings where amino functionality and aqueous stability matter.
Procurement and Pricing: China Spot Ranges for 2026
FOB China spot ranges Q2 2026 — A-171 USD 2.8–3.8k/MT; KH-550/580 4.5–6.5k; Si-69/75 4.0–6.5k. MOQ 200 kg, 2–7 week lead times by region.
SEMITECH FOB China spot ranges in Q2 2026: A-171 (VTMO) USD 2,800–3,800/MT — the highest-volume, lowest-cost grade serving cable insulation and rubber peroxide cure; KH-550 and KH-580 aminosilane and mercaptosilane USD 4,500–6,500/MT; KH-560 / KH-570 / KH-792 epoxy, methacryloxy and diaminosilane USD 5,000–7,500/MT; Si-69 and Si-75 tire silanes USD 4,000–6,500/MT. Western distributor list pricing for Silquest A-series, Dynasylan and Evonik equivalents runs USD 5,500–11,000/MT depending on grade and region; landed-cost gap is typically 30–45% to Asia and 20–30% to Europe after freight equalization. MOQ at SEMITECH is 200 kg per grade; standard packing is 25 kg sealed steel drums (nitrogen-blanketed where moisture sensitivity dictates) or 200 kg HDPE-lined IBC totes; bulk ISO tank shipments of 18–22 MT are available for Si-69/75 and A-171 high-volume buyers. Lead time ex-Zhejiang/Shandong is 2–4 weeks to Southeast Asia, 4–6 weeks to Europe, and 5–7 weeks to North America. All quoted ranges are indicative Q2 2026 spot pricing — contact for current quote.
SEMITECH Silane Grade Reference Table
Eight stocked grades with industry equivalents (Silquest A-series, Dynasylan, Evonik Si-69/75) and CAS numbers for buyer cross-reference.
The table below maps SEMITECH grades to the Silquest, Dynasylan and Evonik counterparts most commonly referenced on TDS and procurement specs. CAS numbers are identical across brands — same molecule, different producer.
| Common Code | International Equivalents | CAS No. | Chemistry | Primary Application | Typical Dosage | Max Use Temp (°C) |
|---|---|---|---|---|---|---|
| KH-550 | Silquest A-1100 / Dynasylan AMEO | 919-30-2 | γ-aminopropyltriethoxysilane (γ-APTES) | Glass fiber sizing, mineral fillers, epoxy/phenolic adhesion | 0.5–1.5% on filler | 200 |
| KH-560 | Silquest A-187 / Dynasylan GLYMO | 2530-83-8 | γ-glycidoxypropyltrimethoxysilane (GLYMO) | Epoxy systems, metal primer, mineral filler treatment | 0.5–1.5% | 180 |
| KH-570 | Silquest A-174 / Dynasylan MEMO | 2530-85-0 | γ-methacryloxypropyltrimethoxysilane (γ-MPS) | UPR/vinyl ester fiberglass, acrylic coatings | 0.5–1.0% | 180 |
| KH-580 | Silquest A-189 / Dynasylan MTMO | 4420-74-0 | γ-mercaptopropyltrimethoxysilane (γ-MPTMS) | Sulfur-cure rubber, metal/glass adhesion, sealants | 0.5–2.0% | 200 |
| KH-792 | Silquest A-1120 / Dynasylan DAMO | 1760-24-3 | N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (DAMS) | Nylon/PBT fiberglass, water-based coatings | 0.5–1.5% | 200 |
| A-171 | Silquest A-171 / Dynasylan VTMO | 2768-02-7 | vinyltrimethoxysilane (VTMO) | Silane-grafted XLPE, peroxide-cure rubber, MV cable insulation | 0.5–2.0% | 250 |
| Si-69 | Evonik Si-69 (Degussa origin) | 40372-72-3 | bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT) | Silica-filled green tire tread (PCR) | 5–10% on silica | 160 |
| Si-75 | Evonik Si-75 | 56706-10-6 | bis[3-(triethoxysilyl)propyl] disulfide (TESPD) | TBR tire (low-scorch), high-performance rubber goods | 5–10% on silica | 160 |
SEMITECH’s silane portfolio delivers chemically identical performance to Silquest, Dynasylan, and Evonik grades at 30–45% lower landed cost with 2–4 week China lead times — a structurally advantaged sourcing position for Asia-Pacific compounders, tire builders, and fiberglass producers.
FAQ
+Are SEMITECH KH-series grades chemically equivalent to Silquest, Dynasylan, and Evonik silanes?
Yes. Each grade shares the same CAS number and molecular structure as its international counterpart — KH-550, Silquest A-1100, and Dynasylan AMEO are all CAS 919-30-2 (γ-APTES). Hydrolysis behavior, filler reactivity, and adhesion performance match within typical lot-to-lot variation. Most formulators qualify SEMITECH grades within 1–2 trial batches without recipe changes.
+What is the MOQ, lead time, and packing for SEMITECH silane grades?
MOQ is 200 kg per grade. Standard packing is 25 kg sealed steel drums (nitrogen-blanketed where required) or 200 kg HDPE-lined IBC totes; bulk ISO tank shipments of 18–22 MT are available for Si-69/75 and A-171 high-volume buyers. Ex-Zhejiang/Shandong lead time is 2–4 weeks to Southeast Asia, 4–6 weeks to Europe, and 5–7 weeks to North America — versus 8–14 week typical replenishment through Western Silquest/Dynasylan distributors.
+When should I choose KH-550 over KH-792 for glass fiber sizing?
KH-550 (γ-APTES, primary amine) is the workhorse for unsaturated polyester, epoxy, and phenolic systems — single primary amine, reactive but doesn’t over-stiffen the interface. KH-792 (DAMS, primary + secondary amine) doubles the reactive sites and is preferred for PA 6/6, PBT, and water-based coatings where higher coupling density and water-borne stability matter. For fiberglass-reinforced PA 6.6 specifically, KH-792 typically delivers 10–15% higher tensile strength than KH-550 at equivalent loading.
+What is the difference between Si-69 and Si-75 in tire compounds?
Both are bis-(triethoxysilylpropyl) sulfides — Si-69 averages 4 sulfur atoms (tetrasulfide, TESPT), Si-75 averages 2 (disulfide, TESPD). Si-69 releases more free sulfur during mixing, which contributes to cure efficiency but raises scorch risk above 150°C — the key constraint in TBR (truck/bus radial) where mix temperatures run higher. Si-75 cuts scorch risk by roughly 20°C and is preferred for TBR tread, retread, and high-performance rubber goods. PCR (passenger radial) green tire tread, with lower mix temperatures and silica-rich formulations, still defaults to Si-69 for cost and cure efficiency.
+What is the price differential between SEMITECH and Silquest/Dynasylan?
In Q2 2026, SEMITECH FOB China spot ranges quoted USD 2,800–3,800/MT for A-171 (VTMO), USD 4,500–6,500/MT for KH-550 / KH-580 aminosilanes, and USD 4,000–6,500/MT for Si-69 / Si-75. Western distributor list pricing for the equivalent Silquest, Dynasylan, or Evonik grades runs USD 5,500–11,000/MT depending on grade and region. Landed-cost gap is typically 30–45% to Asia and 20–30% to Europe after freight equalization.
+How should silane coupling agents be handled and stored?
Store sealed in original drums below 30°C, away from moisture, acids, and direct sunlight. Shelf life is 12 months from manufacture for alkoxysilanes (KH-550 / 560 / 570 / 792, A-171) and 18 months for sulfur-bridged Si-69/75. All alkoxysilanes hydrolyze on contact with atmospheric moisture; opened drums should be nitrogen-blanketed between uses. Handle with nitrile gloves and chemical safety glasses — aminosilanes are mild skin irritants and KH-580 (mercapto) has a strong sulfur odor requiring local exhaust ventilation.
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