Grade Equivalence Chart

Fumed Silica Grade Equivalence: HJSIL ↔ Aerosil ↔ Cab-O-Sil ↔ HDK

Side-by-side equivalence across four brands for hydrophilic 150 / 200 / 300 / 380 and hydrophobic R272 / R274 / R110 / R620 grades, matched on BET surface area and surface treatment chemistry. We can supply either HJSIL or the named Western brand on request — one PO can mix both.

Hydrophilic grades

Untreated, exposed silanol groups, hydrophilic. Used for reactive thickening and reinforcement. BET surface area is the primary technical match metric.

HJSIL (in-house)	Evonik Aerosil	Wacker HDK	Cabot Cab-O-Sil	BET
HJSIL 150	Aerosil 150	HDK V15	Cab-O-Sil L-90	150 ± 15 m²/g
HJSIL 200	Aerosil 200	HDK N20	Cab-O-Sil M-5	200 ± 25 m²/g
HJSIL 300	Aerosil 300	HDK T30	Cab-O-Sil HS-5	300 ± 25 m²/g
HJSIL 380	Aerosil 380	HDK T40	Cab-O-Sil EH-5	380 ± 30 m²/g

Hydrophobic grades

Surface-modified via silane chemistry, converted from hydrophilic to hydrophobic. Treatment chemistry (DMDS / HMDS / PDMS) determines which Western brand is the closest match.

HJSIL (in-house)	Treatment	Evonik Aerosil	Wacker HDK	Cabot Cab-O-Sil
HJSIL R272	DMDS	Aerosil R972	HDK H15	Cab-O-Sil TS-720
HJSIL R274	DMDS	Aerosil R974	HDK H18	Cab-O-Sil TS-720
HJSIL R110	HMDS	Aerosil R812	HDK H30	Cab-O-Sil TS-530
HJSIL R620	PDMS	Aerosil R202	HDK H30RM	—

Mapping is based on published BET data + treatment chemistry. Final spec match should be verified against each brand's current TDS. For the Aerosil R202 / HDK H30RM PDMS slot, Cabot does not market a direct 1:1 equivalent in the same chemistry.

Choose HJSIL — or have us source the Western brand

We're both the direct factory for HJSIL and an authorized-distributor sourcing partner for Evonik Aerosil, Wacker HDK, Cabot Cab-O-Sil. Tell us your preference at quote time and we'll come back with three options: full HJSIL / full Western brand / mixed (HJSIL for the bulk of the order plus original-brand for the specifically required slots).

Get a side-by-side quote (24 h)

FAQ

Are HJSIL grades a true 1-to-1 replacement for Aerosil / HDK / Cab-O-Sil?+

BET surface area, structure, and surface chemistry are matched. For coatings, sealants, and silicone-rubber formulations the substitution is direct in most cases. For optically critical applications (LED encapsulation, transparent silicones) we recommend running a 5 kg validation sample first — we cover the freight on the trial.

Can you supply Aerosil / Cab-O-Sil / HDK instead of HJSIL if my customer specs the Western brand?+

Yes — we maintain supplier relationships with Evonik, Cabot, and Wacker authorized distributors and can source the original brand when the buyer requires it. Quote either side-by-side or pure-Western — we do not push HJSIL when the spec doesn't allow substitution.

What is the typical landed cost difference between HJSIL and the Western reference brand?+

HJSIL pricing typically lands 30–45% under Evonik / Cabot / Wacker at equivalent BET and treatment chemistry, including ocean freight and import duty. Exact spread depends on order quantity, INCOTERM, and destination port — we quote in 24 hours.

Do HJSIL grades carry REACH registration?+

Yes. The fumed-silica CAS (112945-52-5) is REACH-registered. We provide REACH compliance letter on PO confirmation. FDA registration is held separately for the HPSIL® healthcare-silica line, not required for industrial-grade fumed silica.

What size are the validation samples?+

Standard free samples are 1 kg per grade, dispatched within 5 business days. For pilot-line trials we also ship 5 kg or 20 kg samples — these are at-cost (we recover the shipping only).

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