Question 1

What is Industrial MS Adhesive Sealant?

Accepted Answer

MS polymer adhesive sealant is a one-component, moisture-curing elastic bonding and sealing material based on silyl-modified polyether resin. Its molecular structure features a polyether backbone terminated with hydrolyzable silicone groups, which crosslink upon exposure to ambient moisture. MS adhesives combine the weather resistance of silicone sealants with the bonding strength of polyurethane adhesives, enabling simultaneous bonding and sealing functions.

Question 2

What is Industrial Polyurethane Adhesive Sealant?

Accepted Answer

Polyurethane adhesive sealant is a one-component reactive bonding and sealing material based on polyurethane prepolymer. it cures through ambient moisture, which permeates from the adhesive surface inward; isocyanate end groups react with moisture to form a carbamic acid derivative, releasing CO2 and further crosslinking to form a polyurea structure. PU adhesives offer excellent mechanical strength, abrasion resistance, and adhesion, making elastic bonding.

Question 3

What is advantage of Industrial MS Adhesive Sealant?

Accepted Answer

Free of isocyanates and solvents, no hazard safety labels required.
Superior UV stability, ideal for long-term exposed applications.
Permanently elastic even at low temperatures, absorbing stress and vibration.
No CO2 release during curing, no bubble formation.
Can be painted over with water-based paints without cracking.
Excellent adhesion to most substrates without primer.
Virtually no volume shrinkage during curing.
Nearly odorless, improving working environment.

Question 4

What is advantage of Industrial Polyurethane Adhesive Sealant?

Accepted Answer

Excellent tensile and shear strength.
Excellent abrasion resistance and low-temperature flexibility.
Performance can be tuned from soft to rigid through formulation.
Good weather resistance and chemical resistance.
Long application history, mature industry standards and supply chain.
Highly reactive formulations available for fast curing.

Question 5

What is application of Industrial Polyurethane and MS Adhesive Sealant?(1)

Accepted Answer

For structural bonding and sealing of front, rear, and side window glass to vehicle bodies in cars, buses, trucks, and engineering vehicles. The adhesive must provide high shear strength, anti-sagging properties, shock absorption, and sufficient initial grab to prevent glass slippage during curing. MS adhesives are free of isocyanates, increasingly replacing conventional PU adhesives for windshield installation. PU adhesives offer higher tensile and shear strength.

Question 6

What is application of Industrial Polyurethane and MS Adhesive Sealant?(2)

Accepted Answer

For automotive body manufacturing and repair for sealing spot weld seams, lap joints, and overlaps in sheet metal such as steel and aluminum, effectively preventing the ingress of water, dust, and moisture for corrosion protection. Weld seam sealants require good adhesion to pre-treated or painted metal surfaces, and retention of elasticity. MS polymer seam sealants can be with good UV resistance and aging properties, and do not cause corrosion to metal surfaces.

Question 7

What is application of Industrial Polyurethane and MS Adhesive Sealant?(3)

Accepted Answer

Used for structural bonding and sealing of body panels, frame structures, and reinforcements, with high requirements for strength, toughness, and durability. High-strength MS formulations are suitable for bonding frameworks of coaches, caravans, boats, and trains requiring structural stiffness. PU adhesives are the preferred material for elastic structural bonding due to their excellent mechanical strength and adhesion.

Question 8

How to choose Industrial Polyurethane and MS Adhesive Sealant?

Accepted Answer

Environmental compliance priority: For European and American markets, MS adhesives are preferred, free of isocyanates.
Structural strength priority: For structural bonding requiring extremely high tensile and shear strength, PU adhesives are preferred.
Exposed applications priority: For long-term UV exposure, MS adhesives are preferred, with UV resistance clearly superior to PU.

Question 9

How to choose one component and two component industrial Polyurethane and MS Adhesive Sealant?

Accepted Answer

Application efficiency priority: For high-speed automated production lines, 2K systems are recommended, with fast cure and independence from ambient humidity.
Repair flexibility priority: For small-batch, multi-variety scenarios such as 4S shops and repair stations, 1K systems are recommended for easy operation.

Question 10

What is Differences Between One-Component and Two-Component Polyurethane?(1)

Accepted Answer

(1K PU) is a reactive material based on polyurethane prepolymer with isocyanate (NCO) end groups. It is usually pre-formulated and ready to use upon opening, without on-site mixing. 
(2K PU) usually consists of Part A and Part B. Part A is the main agent, containing polyols, polyethers, fillers, pigments, and additives; Part B is generally the curing agent, containing isocyanate or polyisocyanate. Curing occurs through chemical reaction after mixing.

Question 11

What is Differences Between One-Component and Two-Component Polyurethane?(2)

Accepted Answer

1K:Good elasticity and high elongation, suitable for sealing and waterproofing. Strength is generally lower than 2K PU, especially the upper limits of tensile strength, shear strength, and tear strength.
2K:High strength; tensile strength, shear strength, tear strength, and abrasion resistance are usually significantly better than 1K PU. Hardness and elasticity can be widely adjusted, from soft elastomer to rigid material, by changing the A/B ratio and formulation. More fast curing than 1K.

Question 12

Which substrates are MS adhesive and PU adhesive suitable for? Which substrates cannot be used? How should substrates be prepared before application?

Accepted Answer

MS adhesive is suitable for metals (steel, aluminum, stainless steel), wood, glass, concrete, stone, EPDM, etc., and most substrates can achieve excellent adhesion without primer. However, it is not suitable for PE, PP, PC, PMMA, PTFE, soft plastics, neoprene, and bituminous substrates, nor for natural stone and mirrors. PU adhesive is suitable for metals, glass, ceramics, cement products, wood, and most plastic products, but smooth substrates such as glass and metal usually require primer.

Question 13

How do MS adhesive and PU adhesive perform in weather resistance, UV resistance, and outdoor service life? Which one should be chosen for exposed applications?

Accepted Answer

MS adhesive has excellent weather resistance and UV stability, suitable for long-term exposure, with a long service life , resistant to yellowing, suitable for metal roofs, exposed weld seams, outdoor windshields, etc. PU adhesive has good tensile strength, light-colored formulations age under UV, and aromatic PU tends to yellow. For long-term exposure, aliphatic PU or MS adhesive is recommended. If exposure resistance, UV resistance, and non-yellowing are required ,MS adhesive is preferred.

Question 14

What are the differences in mechanical properties between MS adhesive and PU adhesive? How to choose based on application requirements?

Accepted Answer

MS adhesive has a tensile strength of 2-4MPa, elongation of about 300-400%, Shore A hardness 40-55, 100% modulus of about 0.6-1.0 MPa, and tear strength of about 10-15 kN/m. PU adhesive can reach a tensile strength of over 6 MPa, elongation>400%, Shore A hardness of 60-68, 100% modulus of about 1.0-1.5 MPa, and tear strength >20 kN/m. Overall, PU adhesive is significantly better than MS adhesive in tensile strength, shear strength, tear strength, and abrasion resistance.

Question 15

What causes bubbles after applying MS adhesive and PU adhesive? How to avoid and solve them?

Accepted Answer

MS adhesive: Generally no bubbles because curing does not release CO2. If bubbles occur, usually from air entrapped during mixing or moisture/volatiles in the substrate.
PU adhesive: 1K PU releases CO2 during moisture curing, prone to bubbles in thick layers, high humidity, and high temperature. 2K PU doesn't release CO2; bubbles come from air entrapped during mixing.
Avoid: dry and clean substrate; mix slowly; avoid thick single-layer application. 
Solve: cut out bubbles and reapply.

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