Tonsan STP1921

Identification

Chemical Family

Silane-terminated Polymers

GBU

EA

RTU Product Type

1K (1 component) Sealant,

Seam Sealant,

Joint Sealant

Categories

Markets → Automotive & Transportation → Applications → Bonding & Assembly → Sealants

Markets → Electrical & Electronics → Applications → Packaging & Assembly → Adhesives & Sealants

Markets → Industrial → Applications → Power, Water & Utilities → Renewable Energy

Technologies → Adhesives & Sealants → Product Families → Sealing Technology → 1K (1 Component) Sealants

Application Information

Cure Method

Moisture Cure

Applications

Application Area

Containers,

Joints,

Caravans,

Air Conditioning ,

Railway Carriage,

Ventilation Systems,

Vehicle Body,

Solar Energy System,

Electrical Applications,

Apparatus Components

Compatible Substrates & Surfaces

Metal,

Plastics,

Polycarbonate (PC),

Poly(Methyl Methacrylate) (PMMA)

Applications & Uses

Application Instructions

• The substrates must be clean, dry, free of oil and grease.
• Sausage is applied with the corresponding Hand or Air pressure pistols.
• In the case of compressed air application, a pressure of (0.2-0.4) MPa is required.
• After application, STP1921 can be smoothed with soapy water.

Application Limitations

When bonding and sealing PMMA and polycarbonate, under tension, stress corrosion cracking may occur. In such cases STP 1921 should not be utilized.

Paintability Information

STP1921 may be over-painted, however due to the large number of paints and varnishes we strongly recommend a compatibility test before application. The drying time of alkyd resin based paints may increase.

Typical Applications

• Elastic bonding of metals and plastics.
• Elastic, interior and/or exterior seam and joint sealing.
• In the following areas: vehicle body, caravan, railway carriage, container, general metal and apparatus construction; the electrical, plastics, air-conditioning and ventilation industries.

Features

Ready-to-Use Product Features

Good Color Stability,

High Strength,

Non Corrosive,

Odorless,

Thixotropic,

UV Resistant,

Elastic Bonding,

Excellent Primerless Adhesion,

Non-Sagging

Features & Benefits

Labeling Claims

Isocyanates-free,

Silicone-free,

Solvent-free,

Odor-free,

Polyvinyl Chloride (PVC)-free

Packaging & Availability

Regional Availability

• North America

Physical Properties

Physical Form

Paste

Properties

Adhesion Information

STP 1921 has been tested and found to have excellent adhesion to the following unprimed substrates: aluminum, acrylic-coated aluminum, brass, steel, stainless steel, glass, fiberglass, ABS, rigid PVC, polyester and etc. Depending on the surface it can be necessary to roughen the surface or to use a primer as an adhesion promoter to provide optimum adhesion.

Technical Data

	Value	Units	Test Method / Conditions
Application Temperature	5 - 40	°C	-
Cure Rate (at 23±2°C, 50±5 % relative humidity)	approx. 3	mm/24h	-
Elongation (Break)	approx. 350	%	ISO37, GB/T528
Hardness	approx. 35	Shore A	ISO7619, GB/T531
Operating Temperature	-50 to 90	°C	-
Sag Resistance	No sagging	-	-
Short Exposure	120	°C	-
Skin Formation Time (at 23±2°C, 50±5 % relative humidity)	approx. 30	min	-
Specific Density	approx. 1.45	-	-
Storage Temperature	8 - 28	°C	-
Tensile Strength	approx. 1.8	MPa	ISO37, GB/T528

Appearance

White/Black/Gray thixotropic paste

Storage & Handling

Storage Condition

Shelf-life: 12 months in original packaging

Shelf Life

12 months