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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
Key Numbers
8
Active grades in portfolio
2–4 wk
Ex-China lead time
30–45%
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 CodeInternational EquivalentsCAS No.ChemistryPrimary ApplicationTypical DosageMax Use Temp (°C)
KH-550Silquest A-1100 / Dynasylan AMEO919-30-2γ-aminopropyltriethoxysilane (γ-APTES)Glass fiber sizing, mineral fillers, epoxy/phenolic adhesion0.5–1.5% on filler200
KH-560Silquest A-187 / Dynasylan GLYMO2530-83-8γ-glycidoxypropyltrimethoxysilane (GLYMO)Epoxy systems, metal primer, mineral filler treatment0.5–1.5%180
KH-570Silquest A-174 / Dynasylan MEMO2530-85-0γ-methacryloxypropyltrimethoxysilane (γ-MPS)UPR/vinyl ester fiberglass, acrylic coatings0.5–1.0%180
KH-580Silquest A-189 / Dynasylan MTMO4420-74-0γ-mercaptopropyltrimethoxysilane (γ-MPTMS)Sulfur-cure rubber, metal/glass adhesion, sealants0.5–2.0%200
KH-792Silquest A-1120 / Dynasylan DAMO1760-24-3N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (DAMS)Nylon/PBT fiberglass, water-based coatings0.5–1.5%200
A-171Silquest A-171 / Dynasylan VTMO2768-02-7vinyltrimethoxysilane (VTMO)Silane-grafted XLPE, peroxide-cure rubber, MV cable insulation0.5–2.0%250
Si-69Evonik Si-69 (Degussa origin)40372-72-3bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT)Silica-filled green tire tread (PCR)5–10% on silica160
Si-75Evonik Si-7556706-10-6bis[3-(triethoxysilyl)propyl] disulfide (TESPD)TBR tire (low-scorch), high-performance rubber goods5–10% on silica160
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.