In the modern construction and waterproofing industry, metal roof systems have gained widespread popularity across residential, commercial and industrial buildings due to their lightweight structure, convenient installation and long service lifespan. Meanwhile, roof waterproofing membranes serve as the core barrier against rainwater seepage, temperature erosion and outdoor environmental aging, and the bonding performance of pressure-sensitive adhesive (PSA) directly determines the overall waterproof reliability and service life of membrane roofing systems.
Selecting qualified pressure-sensitive hot melt adhesives for metal roof waterproofing membranes has gradually become a crucial technical link for membrane manufacturers and construction contractors, which demands comprehensive evaluation of multiple core performance indicators, including actual coating weight control range, high-low temperature endurance capacity, bonding affinity to low-surface-energy base materials, long-term ultraviolet aging stability, initial adhesion and persistent holding cohesion. Improper adhesive selection frequently triggers common construction defects such as membrane edge warping, adhesive layer creeping, glue layer yellowing after outdoor exposure and debonding under extreme seasonal temperature fluctuations, bringing extra maintenance costs and hidden water leakage risks to roofing projects.
Against such industry market demands and practical construction pain points,KASIUN has independently developed two mature thermoplastic rubber-based PSA hot melt adhesive grades, namely KS1701A and KS1701B, which are custom-formulated exclusively for metal roof waterproof membrane lamination. Both products inherit the excellent comprehensive attributes of thermoplastic rubber hot melt pressure-sensitive adhesives including outstanding anti-ultraviolet capability, instant high initial tack and durable static holding power, while being refined with differentiated formula designs and customized technical parameters to adapt to diversified global climatic environments, varying membrane raw materials and diversified automated or semi-automated production workflows of waterproof membrane factories.
1. Fundamental Coating Requirements and Production Process Parameters
The machining adaptability of hot melt adhesives is a primary consideration for membrane manufacturers during mass production, and KS1701A and KS1701B share consistent core construction parameters to simplify factory production line adjustment and switching between two models. In terms of coating implementation methods, these two adhesives fully support two mainstream industrial coating technologies: roller coating and slot die coating, the two most prevalent processing techniques widely applied in domestic and overseas waterproof membrane production workshops. Roller coating is more suitable for medium and small batch flexible production with easy equipment debugging and low early input cost, whereas slot die coating enables precise quantitative gluing for large-scale continuous automated production and realizes uniform coating thickness control. Besides, the adhesive system maintains stable chemical compatibility with mainstream waterproof membrane base films on the market, covering polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET) membranes, which account for over 90% of raw material usage in the global roof waterproof membrane industry.
From the perspective of practical coating weight index, the recommended construction coating weight is controlled within 15–23 grams per square meter. This numerical range is finalized after repeated pilot coating and outdoor aging verification: coating below 15 g/㎡ tends to cause insufficient adhesive dosage and insufficient bonding strength, leading to partial peeling between membrane and base roof after long-term wind and sun exposure; excessive coating exceeding 23 g/㎡ will cause redundant adhesive overflow, waste raw material cost and result in mutual sticking of coiled finished membranes during storage and transportation. The optimal melting and coating operating temperature is specified from 150°C to 180°C. Within this temperature interval, the hot melt can achieve complete uniform melting without thermal decomposition or carbonization of internal rubber polymer components, effectively avoiding black particle impurities inside the glue layer that damage membrane appearance and bonding performance.
Regarding applicable construction substrates, the product portfolio boasts remarkable universal bonding adaptability, covering galvanized steel panels, colored steel roof tiles, ordinary cement base layers, aged renovated old roof surfaces, and composite inorganic modified base materials commonly used in roof reconstruction projects. For aged roofs with surface dust, slight weathering and uneven roughness, both adhesives can form tight interfacial bonding after basic surface cleaning treatment, greatly expanding the applicable scene of waterproof membrane renovation construction.
2. Product Specification Comparison and Differentiated Technical Advantages & Application Scenarios
2.1 Differentiated Core Product Features
Developed based on the identical thermoplastic rubber PSA backbone formula, KS1701A and KS1701B adopt different tackifier, plasticizer and rubber component ratios to form targeted performance differentiation to cope with split market demands. KS1701A is optimized with low-temperature flowing modification formula, retaining stable fluidity even under ambient temperature as low as -10°C, effectively resolving the common problem of hot melt adhesive solidification and poor spreading in cold climate production environments. In contrast, KS1701B focuses on improving melt flowability and substrate wettability; after hot melting, the adhesive can quickly spread and penetrate into the micropores on the surface of the rough and porous substrate, filling the micro gaps on the substrate surface and forming a seamless bonding interface.
2.2 Targeted Application Scenario Matching
Due to its excellent low-temperature resistance, KS1701A has become the preferred adhesive for production workshops without constant temperature heating equipment, and is especially suitable for the uninterrupted production of waterproof membranes in winter and the construction of outdoor low-temperature roofing.
KS1701B is tailor-made for rough-textured and porous base substrates, including rough cast-in-place cement roofs, porous mortar roof surfaces and rusted uneven color steel base plates. Its superior melt wetting capacity allows the adhesive to permeate substrate surface micropores to form mechanical occlusion bonding besides conventional physical adhesion, drastically improving the long-term bonding stability between waterproof membrane and irregular rough base layers and cutting down post-construction edge peeling failure probability.
3. Five Core Competitive Superiorities vs Conventional Peer Hot Melt Adhesives
Compared with generic roof PSA hot melt adhesives available in the current market, KS1701A and KS1701B series achieve all-round performance upgrades via proprietary formula modification and raw material screening, presenting five prominent competitive edges for downstream manufacturers and construction clients.
First of all, the two grades deliver prominent high-temperature resistance performance with heightened softening point values. During factory high-speed hot-melt coating production, the glue keeps excellent thermal stability and hardly suffers thermal degradation, coking or viscosity sharp fluctuation under continuous heating state; after finished membrane construction, the cured adhesive layer shows outstanding anti-high-temperature aging capacity under long-term summer high-temperature roof exposure, preventing glue layer softening and flowing under blazing sun.
Secondly, the product realizes ultra-wide construction environment adaptability with powerful instant initial tack. The high initial adhesion feature facilitates quick positioning and sticking of waterproof membrane during on-site installation without long-time pressing and fixing, remarkably boosting construction efficiency for engineering teams. Whether used for high-temperature tropical summer construction or cold northern winter laying, the adhesive maintains stable bonding performance without obvious tack attenuation.
Thirdly, advanced anti-UV compound formula endows the adhesive with premium long-term weather resistance. A specially compounded UV stabilizer system is blended into the raw material formulation to block ultraviolet ray damage to internal rubber polymer molecular chains. After years of open-air sunlight exposure, the bonded glue layer effectively inhibits surface viscosity loss and yellow discoloration, protecting the overall aesthetic and waterproof functionality of roofing membrane for decades.
Fourthly, upgraded internal cohesion index outperforms most competing products on the market. Enhanced intermolecular cohesion inside the solidified adhesive layer effectively restrains adhesive creep displacement caused by long-term roof thermal expansion and contraction, wind load pulling and gravity traction, eliminating the hidden trouble of slow membrane sliding and debonding after years of service.
Fifthly, outstanding universal substrate adhesion capacity is reflected in superior bonding effect on diversified membrane raw materials, especially hard-to-bond low-surface-energy polyolefin films such as PE and PP. Most ordinary hot melt adhesives struggle to form stable bonding with low-surface-energy films and easily separate from film edges after temperature alternation; KS1701 series optimizes interfacial compatibility via formula adjustment to drastically reduce the industry’s prevalent membrane edge lifting defect, lowering later engineering after-sales maintenance workload for waterproof contractors.
4. Targeted Optimization Solutions for Common On-Site Construction Defects
During long-term market promotion and on-site construction follow-up, KASIUN’s technical team accumulates massive practical feedback from membrane manufacturers and roofing construction enterprises, focusing on frequent industry pain points including adverse chemical reaction between hot melt glue and PE base films and ubiquitous membrane edge upwarping failure, and completes targeted formula optimization for KS1701A & KS1701B to solve these practical difficulties systematically.
In terms of chemical compatibility optimization, the adhesive formula abandons active chemical additives that may trigger chemical erosion on polyolefin materials, showing chemical inertness against mainstream commercial PE and PP roofing films. No film shrinkage, blistering or chemical corrosion occurs after long-term tight contact between glue layer and base film, fully securing the intrinsic physical performance of finished waterproof membranes.
For long-term outdoor anti-ultraviolet durability, multi-component composite anti-UV auxiliary system is scientifically proportioned in formulation to resist molecular chain fracture induced by ultraviolet radiation, fundamentally avoid gradual tack decline and yellow discoloration of adhesive layer under prolonged sunlight irradiation and extend the whole service cycle of bonded roof waterproof system.
Raised internal structural cohesion effectively controls glue creep phenomenon, which is the core technical measure to solve membrane edge lifting. When roof bears seasonal cold-hot alternating deformation and external wind force pulling, high-cohesion adhesive layer restricts relative displacement between membrane and base substrate, minimizing edge curling probability from source.
To satisfy flexible production and inventory management needs of different-sized clients, KASIUN provides two standardized packaging specifications for convenient logistic and usage: 190-kilogram fiber drums designed for large-scale membrane factories equipped with automated bulk hot melt melting equipment to realize continuous uninterrupted feeding and mass production; 1-kilogram coated solid glue blocks suitable for small-batch trial production, engineering after-sale repair work and small-sized processing enterprises without large melting machines, helping users control raw material procurement loss and inventory capital occupation.
5. Scientific Product Selection Guidance & After-sale Technical Service Support
For purchasers and construction engineers searching for premium metal roof membrane pressure-sensitive hot melt adhesives featuring reliable UV resistance, stable thermal performance and strong bonding on steel, color steel and cement substrates, KASIUN KS1701A and KS1701B stand as optimal customized alternatives in the current global waterproofing adhesive market, and users can complete accurate model selection according to local climatic characteristics, substrate condition and production equipment configuration.
If projects or factory production are carried out in low-temperature environments with ambient temperature dropping to minus 10 degrees Celsius or below, KS1701A with outstanding low-temperature fluidity is the preferred choice to guarantee smooth gluing processing and stable on-site bonding effect under frigid conditions. When construction targets rough porous cement, aged uneven roof and rusted color steel base surfaces requiring sufficient glue infiltration and base material wetting, KS1701B with superior melt flowability and surface wetting performance should be prioritized to maximize interfacial bonding tightness between membrane and substrate.
KASIUN’s professional global technical service team is ready to provide free product sample delivery, on-site production process debugging guidance and customized formulation adjustment services for all potential partners. Clients from waterproof membrane manufacturing industry, roofing engineering construction enterprises and adhesive distributors can get in touch with KASIUN’s business department at any time to acquire free test samples, detailed technical datasheets and personalized professional technical consultation, realizing targeted matching of adhesive products with individual production and construction requirements.
