Spu-321 Hm for Auto Industry Joint Polyurethane Sealant

• Application: Automobile, Construction
• Bonding Function: Structural Adhesive
• Color: Black
• Model NO.: SPU-321 HM
• Composition: Organic Material
• Chemical Base: 1-C Polyurethane
• Transport Package: 310ml Cartridge, 600ml Sausage

Product Description

Technical Date Sheet(TDS)

1. Description

SPU-321 HM is a one-component, moisture-curable, polyurethane-based, elastomeric adhesive sealant. After curing, it provides a permanently elastic bond to fasten materials with different coefficients of expansion.

1. Advantages

• Good Adhesion to a wide range of substrates.
• Cures rapidly to a permanently elastic consistency with excellent cut and tear resistance.
• Solvent free, no odor.
• Surface paintable with water, oil, and rubber-based coatings.
• Non-corrosive.
• Provides shock resistance and vibration damping.
• Exhibits high recovery, making it ideal for sealing dynamically moving joints.
• Weather resistant.

1. Technical Information

The product complies with the 25LM standard of JC/T482-2022 "Polyurethane Building Sealant"

Items	Technical Index
Chemical base	1-C polyurethane
Color	black, white, grey
Packaging	310ml cartridge, 600ml sausage
Density	1.45± 0.05 kg/l
Non-sag properties	Good
Application temperature	5°C-35°C
Tack-free time*	40-60 min.
Curing speed*	≥3.0mm/24 hrs
Shore A hardness	~40
Tensile strength	~1.8N/mm^2
Shear Strength	~1 N/mm^2
Elongation at break	≥500%
Tear propagation resistance	≥10 N/ mm
Service temperature (permanent)	-40°C to +90°C
Short - term (1 day)	120°C
(1hour)	140°C
*= at 23°C and 50% relative humidity

1. Applications

• Vehicle bodies and cab construction including panels, underbody components, and roofing.
• Front and rear spoilers, auto trim, moldings, body seams, and welded joints.
• Waterproofing exterior lap seams in many applications, including truck trailers, RV's, metal roofs, window perimeters, grain bins and HVAC units.
• Waterproofing rivet seams.
• Sealing of exposed and concealed joints of aluminum, steel, coated metals, wood, roof rails, and door hinges in transport equipment.
• Sealing and caulking expansion joints, pre-cast concrete panel joints and joints between logs on log homes.

1. Construction Process

• Cleaning:

Clean surface with a strong jet of compressed air, sandblast, or solvent to ensure the surface being clean, dry, free of oil, grease, and of sound quality.

• Activating/Priming:

Activators and/or primers may be required to achieve optimal adhesion depending on the nature of substrates.

• Application of sealant:

Cut tip to desired shape and size. Puncture airtight seal. Install with hand or power operated gun and extrude the sealant into the joint. Clean excess sealant using hard rubber plate or finger wet with soap solution.

1. Storage and shelf life

When stored at the recommended conditions in original, unopened containers, this product has a shelf life of 12months for cartridge and 9 months for sausage.
The shelf life of polyurethane sealant is related to the temperature and humidity of the environment. The recommended storage temperature is 5-25°C, humidity is < 50% RH. It is strictly prohibited that the
transportation or storage temperature is over 30°C or the humidity is over 80% RH. And high-temperature container transportation is prohibited as well. In the long-time high temperature and high humidity storage environment, the product is easy to get viscous, extrusion will be deteriorated and shelf life will be shortened.

1. Caution

The product contains isocyanates, which may cause skin and eye irritation. Avoid eye-contacting and ingestion.

1. Health and Safety

Please read the safety manual carefully, our security experts will be pleased to give you advises about safety, health and environmental issues.

1. Product Responsibility

The above information and recommendations which are based on our experience are as for reference,
they can't replace the customers' own experimental results. In any application, the customer shall be
responsible comply with obligations of third-party intellectual property rights. Without our consent,
anyone shall not provide technical information to third parties.

1. Other Information 

Company name:Beijing Oriental Yuhong Waterproof Technology Co., Ltd
Address:No.19, Kechuang 9th Street, BETDA, P.R. Beijing, China 101111.