Chengdu Guibao Science & Technology Co., Ltd.,

Class 50 668 Low Modulus Silicone Sealant For Concrete Joints

Product Details:
Place of Origin: CHINA
Brand Name: GUIBAO
Certification: ISO
Model Number: 668
Payment & Shipping Terms:
Minimum Order Quantity: 590ml: 2000pcs
Price: Negotiable
Packaging Details: Sausage :590ml or Pail : 20kg
Delivery Time: 4 work days
Payment Terms: T/T
Supply Ability: 20000pcs/4 work days
  • Detail Information
  • Product Description

Detail Information

Color: Grey, Black Material: Silicone Sealant
Application: Concrete Joint Seal,gap Fill, Pavement , Airport Run Way, Bridge, Highway Elongation At Break: 600%
Movement Capability: +100~-50 Key Words: Concrete Joint Seal,gap Fill, Pavement
High Light:

668 Low Modulus Silicone Sealant


Class 50 Low Modulus Silicone Sealant


Class 50 668 lmn silicone sealant

Product Description

Silicone Sealant for Concrete Joints Low Modulus Class 50


GB 668 is specially designed for the lasting weatherproofing seal of concrete joints. Because of its low modulus and excellent extension and compression recovery (+100/-50 percent of original joint width), GB 668 exhibits outstanding performance in highway, airport, bridge and other concrete joints where high movement occurs. Accelerated weather aging test proves that GB 668 is definitely qualified to withstand the temperature extremes and strong violet rays of concrete pavement. Once exposed to moisture in the air, GB668 begins its room temperature cure to form an elastic silicone rubber with lasting weatherproofing seal performance.




One part,ready to use as supplied ,good gunnability, dispensed directly from container into joints by hand or with an air-powered pump

Excellent unprimed adhesion and bonding to concrete

Highmovementcapability-able to accommodate the extension and contraction, and shear deformation of concrete joints without itself being destroyed

Lowmodulus-abletostretchinthejointwithlittleforce.Thiscan better protect the concrete surfaces from being damaged

Resilient-oncecured,stronganti-embeddingperformance,preventing gravels and other incompressible into the joints which may result in joint edge failure

Highlyelasticityandextensionrecovery-thesealantcanbestretchedto 100 percent or compressed to 50 percent of the joint width. When released, it will resume its original shape without splits or cracks

Excellenttemperatureextremeresistance-curedGB668hasastable performance over the temperature range from -60°C to +150°C

Excellent lasting weatherability-the Si-O-Si high energy bond can not be destroyed by UV or ozone




These values are not intended for use in preparing specifications.

Test Method Property Unit Result
GB/T 13477 (ASTM D 2377) Tack free time min. 60
GB/T 13477 (ISO 8394) Extrusion rate ml/min. 180
GB/T 531 (ISO7619) Hardness Shore A 30
GB/T 13477 (ISO 8339) 100% modulus MPa 0.4
GB/T 528 (ISO 37) Elongation at break(dumbbell type) % 600
GB/T 13477 (ISO 11600) Movement capability % +100~-50
ASTM C793 Aging resistance   Qualified
GB 18583-2008 TVOC g/L 53

*GB: Chinese National Standard

ASTM: American Society for Testing and Materials

ISO: International Standardization Organization






















GB 668 should not be applied:

In totally confined spaces as sealant requires atmospheric moisture for cure

To frost laden or damp concrete surfaces

When substrate surface temperature is below 4℃ or over 40℃

New concrete should be allowed to cure and dry for at least 28 days of good drying weather. For each day of rain that occurs during that period, an additional day should be added to the 28-day drying time. For fast completion and or high early concrete

mixes, please contact GB Technical Services

The sealant bead should be recessed below the surface of concrete surface to prevent abrasion from traffic and snow removal equipment.

The adhesion to substrates other than concrete should be checked before performing full-scale sealing.


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