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Adhesive for bonding silicone to ABS
20 Oct 2026
There are two types of glue that can be used to bond silicone to ABS.
I. Room-temperature-curing slow-drying adhesive
1.Product Overview of KN‑300A
KN‑300A is a room‑temperature vulcanizing (RTV) silicone adhesive specially designed for bonding cured silicone rubber to metals and plastics including ABS.
2.Operating Steps for Bonding Silicone to ABS with KN‑300A
①Surface preparation: Wipe the ABS substrate with absolute ethyl alcohol to remove grease and release agent. Do NOT use toluene as it will damage ABS. Clean the silicone surface as well and make sure both surfaces are fully dry.
②Adhesive application: Apply KN‑300A and control the adhesive thickness ≤1 mm.
③Assembly & pressing: Apply uniform pressure after fitting. Keep pressing for at least 30 minutes to obtain initial fixture strength.
④Full curing: Allow 24 hours at room temperature for complete curing. Do not conduct strength, waterproof or thermal cycling tests before full cure.
3.Key Technical Parameters of KN‑300A
①Appearance: Colorless semi‑transparent paste
②Temperature resistance: ‑60℃ ~ 200℃, with excellent UV and ozone resistance
③Hardness: 30A. Cured glue remains flexible, non‑whitening and non‑hardening
④Viscosity: 150000 CPS
4.Suitable Applications for KN‑300A
Silicone rubber gaskets, insulation sealing for electronic components, silicone accessories on ABS housings, automotive silicone spare parts. Suitable for assemblies requiring elasticity, shock‑buffering, wide temperature resistance and weather resistance.
5. Safety Precautions for KN‑300A
Avoid eye contact. In case of eye contact, rinse eyes thoroughly with plenty of clean water and seek medical treatment immediately. Keep the container well‑sealed after application.
II. Instant Adhesive for Silicone‑to‑ABS Bonding
1.Product Overview of 490
490 is a one‑component α‑cyanoacrylate instant adhesive that realizes mutual bonding between silicone rubber and ABS plastic.
2.Operating Steps for Bonding Silicone to ABS with 490
①Substrate preparation: Clean grease from ABS and silicone surfaces with alcohol. Sanding is allowed for stubborn release agent.
②Apply K770 series silicone primer on the silicone surface and let it air‑dry for 3‑5 minutes. Extend drying time under humid or rainy weather.
③Dispense 490 adhesive on one bonding surface only. Press the two substrates together for several seconds to achieve positioning.
3.Key Technical Parameters of 490 Adhesive
①Appearance: Colorless transparent liquid
②Curing time: ≤50 S
③Viscosity: 5‑10 mPa.s (measured at 25℃)
④Shear strength: ≥20 MPa
⑤Temperature resistance: 80℃
4.How to Solve the Whitening Issue When Using 490
490 is a low‑whitening grade, but whitening may still occur under high‑humidity conditions. Place bonded parts in a well‑ventilated area to reduce whitening risk. Prolong K770 primer drying time in rainy weather. Remove excess squeeze‑out glue with matching T02 debonder.
5.Safety Precautions for 490 Adhesive
This adhesive cures very fast. Work in a well‑ventilated environment. Prevent skin and fabric adhesion. In case of eye contact, flush with a large amount of water and go to hospital at once. Clean overflow glue with T02 debonder.
