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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
| 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
Chinese KH-xxx naming maps directly to Western grades at 30–45% lower landed cost. SEMITECH manufactures from Zhejiang and Shandong with integrated chlorosilane feedstock supply.
Application Coverage: Glass Fiber, Tire Rubber, Coatings
- Glass fiber and reinforced plastics — KH-550 for UPR/epoxy/phenolic; KH-792 for nylon 6/6 and PBT (10–15% higher tensile than KH-550); KH-560 for epoxy; KH-570 for vinyl ester. Dosage 0.5–1.5%.
- Tire and silica-filled rubber — Si-69 (TESPT) for PCR green tire tread at 5–10% on silica, 15–25% hysteresis reduction. Si-75 (TESPD) for TBR where lower scorch risk above 150°C is the constraint.
- Coatings, adhesives, sealants, cable — KH-580 for sulfur-cure rubber and sealant adhesion; A-171 (VTMO) for silane-grafted XLPE cable insulation; KH-792 for water-based coatings.
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Procurement and Pricing: China Spot Ranges for 2026
FOB China Q2 2026: A-171 USD 2,800–3,800/MT; KH-550/580 USD 4,500–6,500/MT; KH-560/570/792 USD 5,000–7,500/MT; Si-69/75 USD 4,000–6,500/MT. Western distributor list runs USD 5,500–11,000/MT. MOQ 200 kg; 25 kg sealed steel drums or 200 kg IBC totes; bulk ISO tank for Si-69/75 and A-171. Lead time 2–4 weeks to SE Asia, 4–6 weeks to Europe, 5–7 weeks to NA.
SEMITECH Silane Grade Reference Table
| 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 |
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. Most formulators qualify within 1–2 trial batches without recipe changes.
+What is the MOQ, lead time, and packing?
MOQ 200 kg. 25 kg sealed steel drums (nitrogen-blanketed where required) or 200 kg IBC totes. Bulk ISO tank for high-volume. Lead time 2–4 weeks to SE Asia, 4–6 weeks to Europe, 5–7 weeks to NA.
+When should I choose KH-550 over KH-792 for glass fiber sizing?
KH-550 (primary amine) is the workhorse for UPR, epoxy, and phenolic. KH-792 (primary + secondary amine) is preferred for PA 6/6, PBT, and water-based coatings — typically 10–15% higher tensile in fiberglass-reinforced PA 6.6.
+What is the difference between Si-69 and Si-75?
Si-69 (tetrasulfide) releases more free sulfur, better cure efficiency but higher scorch risk above 150°C — default for PCR green tire. Si-75 (disulfide) cuts scorch risk by ~20°C — preferred for TBR tread and high-performance goods.
+What is the price differential?
SEMITECH FOB China is 30–45% below Western distributor list to Asia, 20–30% below to Europe after freight.
+How should silane coupling agents be stored?
Sealed below 30°C, away from moisture. Shelf life 12 months for alkoxysilanes, 18 months for Si-69/75. Opened drums should be nitrogen-blanketed.