Chengdu Guibao Science & Technology Co., Ltd.,

GUIBAO 661 Neutral Silicone Sealant For Auto Light

Product Details:
Place of Origin: CHINA
Brand Name: GUIBAO
Certification: IATF 16949:2016, Rohs
Model Number: 661
Payment & Shipping Terms:
Minimum Order Quantity: 310ml: 720pcs
Packaging Details: Cartridge: 310ml
Delivery Time: 4 work days
Payment Terms: T/T
Supply Ability: 20000pcs/5 work days
  • Detail Information
  • Product Description

Detail Information

Color: Black, Grey Application: Car Lamp, Car Light, Automotive Lights
Type: One Part Material: Silicone Sealant
Feature: Low VOC Key Words: Car Lamp, Car Light, Automotive Lights
High Light:

661 Neutral Silicone Sealant


Auto Light Neutral Silicone Sealant


661 neutral cure silicone sealant

Product Description

GUIBAO 661 Neutral Silicone Sealant For Auto Light


Watertight bonding and sealing automotive lights

Flange seal for the transformer and internal-combustion of automotive

Watertight seal of other high-end light




One part, neutral room temperature cure to form an elastomeric rubber

Stable performance from –55 ℃ to +180 ℃

Excellent unprimed adhesion to a wide range of materials such as metal, plastic, porcelain and glass

Low volatile



These values are not intended for use in preparing specifications

Test Method Property Unit Result
As supplied
  Appearance   Non-flowing paste
GB/T 13477 (ISO 7390) Slump mm 0
GB/T 13477 (ASTM D 2377) Tack free time( 23℃) min. 30
Cured after 7 Days, at 23 and 45%~55% RH
  Appearance   Elastomeric Rubber
GB/T 531 (ISO 7619) Hardness Shore A 46
GB/T 528 (ISO 37) Tensile Strength MPa 2.3
GB/T 528 (ISO 37) Elongation at break % 270






















GUIBAO 661 should be stored in original unopened containers. The shelf life is 9 months from the date of manufacture.




GB 661 should not be applied

As structural sealant

In totally confined spaces

In continuous water immersion

When material surface temperature is below 4℃ or over 50℃.




Surface Preparation

All surfaces of the substrates must be clean and dry. All dust, grease, rust, etc. should be removed.



GUIBAO 661 has excellent unprimed adhesion to most substrates.

Priming or plasma processing is necessary for the low surface energy substrates such as PTFE, Polypropylene, Polyethylene

The cure time may extend when the sealant is applied into deep section or when the ambient temperature is low



For optimal adhesion, GUIBAO primer is recommended.

Clean the substrate surface with solvents and then apply a coat of primer by dipping, brushing or spraying.

Allow primer to dry for 5~10 minutes. Apply the silicone sealant onto the primer once the substrate surface a little sticky when touched with hand.

For special applications, drying in the shade, humidification and drying in the high temperature should be adopted to ensure the cure stability.


Application Method

GUIBAO 661 can be applied manually.

Apply a bead of GB LV 661 with a dispensing gun to one of the prepared surface, and then cover quickly with the other substrate to be bonded. If applied to deep section, especially when access to moisture is restricted, it takes longer to cure completely. And cure time is extend at lower temperature and humidity

GUIBAO 661 can also be applied with dispensing machines




Should uncured silicone sealant contact with eyes, rinse thoroughly with a lot of water and seek medical treatment if irritation persists.

Keep the uncured silicone sealant away from children.

Good ventilation is necessary for work and cure places.




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