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Low Modulus Construction Sealant

Single component polyurethane construction sealant PU821Detailed Product DescriptionPU821 is one component polyurethane construction sealant of low modulusFeatures1.Low modulus and high elasticity,

If you are planning to wholesale best cheap and high quality low modulus construction sealant China, or hot sale low modulus construction sealant in China from professional settlement joint of construction adhesive, contrect wall stone construction adhesive, waterproof joints sealing polyurethane sealant manufacturers and suppliers and factory, please feel free to contact SEPNA, and welcome to check products price with us.

Single component polyurethane construction sealant PU821

◆Detailed Product Description

PU821 is one component polyurethane construction sealant of low modulus


1.Low modulus and high elasticity, good sealing and water-proof property

2.One component, convenient to construct, nonpoisonous and tasteless after curing, green and environmental

3.Bonding well with many substrates, no corrosion and pollution to substrate 

4.Good compatibility between new and used adhesive, convenient to repair

5.Excellent aging, water and oil resistance, moldiness 


1.Sealing of expansion and settlement joint of construction

2.Sealing of upstream face crack of drainage pipeline

3.Sealing of through holes on wall and at floor concrete

4.Sealing of joints of prefab, side fascia, stone and color steel plate

◆Data Table

Model Number

PU 821

Main Raw Material





30±5 Shore A





Volatile content




Touch dry time


Elastic recovery


Pollution properties


Elongation at break


Application temperature



①All data above ware tested under standardized condition.

②All data listed in the chart were for rhe generalized item in the series; please refer to the related datasheet for special items.

③Storage condition has a direct impact to the products’ shelf life, Please refer to the instruction for special items’ storing.


Clean before operation

Clean and dry all surfaces by removing foreign matter and contaminants such as oil dust, grease, frost, water, dirt, old sealants and any protective coating. Dust and loose particles should be  cleaned.

Direction of operation

Tool:Manual or pneumatic plunger caulking gun

For cartridge

1.Cut nozzle to give the required angle and bead size

2.Pierce the membrane at the top of the cartridge and screw on the nozzle

3.Place the cartridge in an applicator gun and squeeze the trigger with equal strength

For sausage

1.Clip the end of the sausage and place in barrel gun

2.Screw end cap and nozzle on to barrel gun

3.Using the trigger extrude the sealant with equal strength

Attention of operation

Wear suitable protective clothing, gloves and eye/face Protection. After contact with skin, wash immediately with plenty of water and soap. In case of accident or if you feel unwell, seek medical advice immediately

◆Package and Storage

Package                                                    Storage

310ml cartridge, 20pcs/carton                   Keep in cool and ventilative place

400ml/600ml sausage, 20pcs/carton        Temperature≤25℃, humidity≤50%RH

Color: Black /White/Gray                           Shelf life: 9 months

◆Safety Operation Material

MSDS isn't included here. Please read TDS, MSDS and label carefully before operation.You can get MSDS from SEPNA or other distributors, or mail to service center, or call +86-400-882-1323.

◆Product Warranty

All product properties and application details based on information believe to be reliable and accurate. But you still need to test its property and safety before application. The advices we supply don't apply in any circumstances. SEPNA don't make assurance of any other applications outside the specification until SEPNA supply a special written guarantee. SEPNA is only responsible to replace or refund if this product is defective within the warranty period stated above. SEPNA makes it clear that will not be liable of any accidents.

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