Lightweight wall system such as hollow core panel, ALC (autoclaved lightweight concrete) panel, cemboard, EPS was designed to provide the industry with a new perspective in building cost management, construction productivity and process efficiency. Besides, drywall materials like magnesium oxidide board, calcium silicate board, fiber cement board, gypsum board, plywood or oriented strand board are commonly used in the market as well. Our Rhinoz lightweight jointing solution shall be the key to improvement of efficiency and quality. Lets see how our FX55 hybrid jointing solution can prevent crack and seal lightweight panel joints.
The key to complete precast system
Precast concrete is widely used due to its advantages, including storm and earthquake resistance, consistant quality control with international standards, the shorter the construction period, reduction of dependance on labor, and better cost control. Drawbacks of using precast concrete panels such as visible joints between precast panels, high movement, especially high rise structures, thermal movement that under tropical climate and large jointing gap caused by non-aligned precast concrete wall panels eventually can be overcome by our Rhinoz precast jointing solution RF134.
Evaluation of Sealed Joint Performance for selection of ALC panel joint sealants (Autoclaved Lightweight Concrete Panels
The strength of autoclaved lightweight concrete (ALC) is evidently lower than that of normal concrete. Therefore, when movement occurs at a sealed joint between ALC panels, the sealant is required to deform and remain intact without damaging the ALC substrate. However, there is currently not sufficient information to permit evaluation of the expected performance of sealants applied to ALC substrates.
In their study pushed on July 2012 Journal of ASTM International 9(1):104064, the researchers carried out static and dynamic tests in order to obtain an index that could be used to select the modulus of a sealant that can be expected to provide long-term performance when applied to an ALC substrate.
To develop this index, an initial study was carried out in order to clarify actual joint movement between ALC panels of buildings; the expansion and contraction at the joint were measured, and shear joint movement was calculated based on the expected story-to-story drift of an external wall due to earthquake loads.
Thereafter, in a subsequent stage of the study, five types of two-component polyurethane sealant products, of different elastic modulus, were subjected to tensile and shear tests from which the relationship between stress and the type of joint fracture was determined. The results from these tests revealed that when the stress is greater than 0.6 to 0.7 N/mm2, the ALC substrate is more easily fractured than the sealant.
In a final stage of the study, the cyclic fatigue resistance of the same two-component sealants was evaluated using tensile and shear fatigue tests. Results from the fatigue tests indicated that the high modulus sealants lost adhesion from the ALC substrate at an early stage in the test. As well, the fatigue resistance of test specimens with joints having three-sided adhesion was lower than that of specimens having normally configured joints with adhesion on two sides of the sealant.
Therefore, on the basis of results derived from all the studies, it was determined that a suitable sealant for use on ALC substrates is a sealant having a low modulus that is applied in the normal fashion as a two-sided joint.
After decades of R&D, Kaneka Group in Japan invented MS sealant (Modified silicone sealant) AS4001S high performance sealant for construction joint and ALC panen joint with such outstanding features as:
Good Environmental Choice Australia (GECA) certified
ASTM C920 (Class 50) compliant
ISO 11600 (F Class 25 LM) compliant
Good UV resistance
Low static charge – Less dirt streaking
No silicone oil – Non-staining on adjacent substrates
No isocyanate – No air bubbling
No solvent – No shrinkage
Bonds most substrates without primer
see below for details:
Learn more about high performance for precast joint here
Đánh giá hiệu suất làm việc của khe nối trám keo để lựa chọn đúng keo trám khe nối tấm ALC
Sức bền của tấm bê tông khí chưng áp ALC (Autoclaved Lightweight Concrete – sau đây gọi tắt là tấm ALC) thấp hơn bê tông thông thường. Do đó, khi có biến động tại khe nối giữa các tấm ALC được trám keo đàn hồi, keo trám khe phải biến dạng, đồng thời vẫn bám dính tốt và không làm ảnh hưởng đến 2 mép tấm bê tông ALC. Tuy nhiên, hiện chưa có đủ thông tin để đánh giá hiệu suất làm việc của keo trám khe nối tấm ALC. Trong bài nghiên cứu của mình đăng trên tạp chí Journal of ASTM International – tháng 7/2012, các nhà nghiên cứu tại đại học Chungnam National University và National Research Council Canada đã tiến hành các thí nghiệm động và tĩnh để đưa ra 1 chỉ số làm cơ sở lựa chọn module đàn hồi của keo trám khe nhằm bảo đảm hiệu suất làm việc lâu dài của keo trám dùng cho khe nối tấm ALC.Để thiết lập được chỉ số này, các nhà nghiên cứu cố gắng hiểu biến động thực tế giữa các tấm ALC trong công trình; giãn nở và co ngót tại khe nối đã được đo và biến động của khe nối được tính toán dựa trên mức độ trượt dự kiến của tường ngoài giữa các tầng dưới tác động của tải trọng động đất. Vì vậy, nhóm nghiên cứu đã sử dụng 5 loại keo trám khe gốc PU có độ co giãn đàn hồi khác nhau, được thí nghiệm với bài kiểm tra kháng xé và căng kéo khác nhau. Kết quả thí nghiệm cho thấy khi ứng suất lớn hơn 0.6-0.7N/mm2, mép tấm bê tông ALC dễ bị vỡ hơn keo trám khe. Trong giai đoạn cuối của quá trình nghiên cứu, khả năng kháng mỏi theo chu kỳ của keo trám 2 thành phần được đánh giá dựa trên các thí nghiệm về khả năng kháng mỏi và căng kéo. Kết quả thí nghiệm khả năng kháng mỏi cho thấy các dòng keo trám khe đàn hồi có modul đàn hồi lớn bị mất bám dính với mép tấm ALC ngay trong giai đoạn đầu của thí nghiệm. Khả năng kháng mỏi của các mẫu keo trám khe có bám dính 3 mặt thấp hơn khả năng kháng mỏi của các mẫu keo được trám cho khe nối được thiết kế chuẩn, chỉ bám dính 2 mặt. Các kết quả nghiên cứu chỉ ra rằng keo trám phù hợp cho khe nối ALC là keo trám có modul đàn hồi nhỏ và bám dính 2 mặt.Giải thích thêm: keo trám khe có module đàn hồi nhỏ và lớn được giải thích đơn giản là: modul đàn hồi nhỏ chỉ cần một lực nhỏ để có thể căng kéo mẫu keo và có độ đàn hồi tốt hơn, keo trám có modul đàn hồi lớn hơn sẽ cứng hơn khi đã lưu hóa.Xem thêm keo trám khe nối tấm ALC đàn hồi hiệu suất cao MS sealant AS4001S Keo trám khe nối tấm ALC AS4001S được các chuyên gia khuyên dùng để trám trét các mối nối thi công như:
Khe co giãn
Mối nối thi công
Mối nối các tấm ốp tường, v.v.
Trám trét mối nối các tấm kim loại hoặc đá
Vành đai cửa/cửa sổ
Có thể sử dụng để trám khe các cấu kiện bằng sứ, kim loại mạ, tấm epoxy và polyester, polystyrene, uPVC, thép không gỉ, alu đã a-nốt hóa và gỗ hoàn thiện, trám khe nối, mối nối tấm bê tông cốt sợi thủy tinh GRC, tấm bê tông đúc sẵn acotec, ALC, EPS.
Bolt and nut corrosion protection by Nitohullmac XG | How it works
| FunctionsProtect metal structures such as bolts, nuts, flanges, pole connector plates from corrosion.| Corrosion protection requirements
Encapsulation system that covers all bolts, nuts and flanges in one application and is maintenance free;
Sprayable organic coating system, polymeric resin based, providing protection for any metallic surface;
Remove easily (as it does not adhere to the substrate) without the need for special equipment and reusable (recyclable) ;
Its formula contains corrosion inhibitors that offer equipment maximum protection against contamination and corrosion. The polymeric resin surrounds the metal component providing a passive protection while allowing the oil based corrosion inhibitors to actively protect the substrate and arrest any existing or new corrosion by starving the process of oxygen and preventing moisture/ dust ingress
| Surface preparationMinial surface prepration is required.| Ease of applicationSimple application, especially easy to apply on hard-to-reach areas, irregularly shaped items such as flanges, bolts, nuts, connectors etc.| Application proceduresSee here
| What is LEED?LEED (Leadership in Energy and Environmental Design) is an internationally recognized green building certification system, providing third-party verification that a building or community was designed and built using strategies aimed at improving performance across all the metrics that matter most: energy savings, water efficiency, CO2 emissions reduction, improved indoor environmental quality, and stewardship of resources and sensitivity to their impacts.Developed by the U.S. Green Building Council (USGBC), LEED provides building owners and operators a concise framework for identifying and implementing practical and measurable green building design, construction, operations and maintenance solutions.LEED provides a point system to score green building design and construction. The system is categorized in five basic areas:
Energy and Atmosphere;
Materials and Resources; and
Indoor Environmental Quality.
Buildings are awarded points based on the extent various sustainable strategies are achieved. The more points awarded the higher the level of certification achieved from Certified, Silver, Gold, to Platinum.LEED provides a sustainability framework for design, construction, operations, and maintenance of new and existing buildings.AS-4005 is able to meet the low-VOC architectural sealant requirement. With the low VOC feature, the use of AS-4005 could contribute to Leadership in Energy and Environmental Design (LEED) credits under the IEQc4.1: Low-Emitting Materials – Adhesives and Sealants credit category.
The white colour of AS-4005 meets the requirements of CSM (Cleanroom Suitable Materials) standard, hence it is recommended for applications in electronics cleanrooms.
Click here for more details.
by VTS team
Automotive painting masking tape| 5 selection criteria : heat resistant, easy to remove leaving adhesive residue, easy to tear, conformability to curved lines, compatible with the most common paints.
In automotive repair or painting, it is required to cover and protect those parts of the vehicle which are not to be worked on to protect them from unwanted damage, soiling or paint overspray.A good preparation using automotive painting masking tape from the very beginning reduces or even eliminates any unnecessary clean-up or rectification afterwards.
Time consuming masking activities can be minimised by using high quality material and good application techniques and it is always worth investing into premium masking tapes, which can be effortlessly removed without slithering, slicing or leaving adhesive residue.
But how can you recognize the best masking tape for automotive painting?Below are key criteria: heat resistance, easy hand-tearibility, leave no residue, bonding to various substrates, compatible with various common types of paint.5 key features that distinguish the best automotive painting masking tape from all other standard tapes:
Easy to remove
Easy to tear
Conformability to curves
Compatibility to a wide range of paints.
# 1. Heat resistanceAutomotive painting masking tape must be heat resistant, which means it must be able to withstand the high temperatures in the paiting booth to assure that it must not come off, fall, slide along the surface of the body, crumble or have other behaviors that could ruin the result of painting.# 2. Easy to removeIt is very important that the masking tape, once removed, leaves no traces of glue on the shock. In the same way, it is essential that when you remove it, you do not take off any parts of the bodywork paint, and that the edges result clean and clean.# 3. Easy to tear by handDuring a painting and finishing of the body work, having to cut the masking tape with scissors slows down the pace of work, it is dangerous and uncomfortable too. That’s why the best automotive painting masking tape can easily be broken with your hands, even into very small pieces# 4. Conformability to curvesThe lines that define the shapes of the bodywork are only in very small part straight lines: mostly, automotive painting is about turning around curved lines. As a result, it is of fundamental importance that the automotive painting masking tape is easy to lay down even where it has to follow curved trajectories.# 5. Compatibility to various paintsFinally, the best automotive painting masking tape is the one that fits without any problem to all types of most common paints, primers and fillers. This means that the adhesion is always impeccable – even when using water-based paints – and that the shape and characteristics of the tape do not change during the application of the paint, but always remain at their top.|Read more: Nitto Masking tape No.7288 | 3 reasons to use masking tapeAlways one step ahead in making good things happen with its masking tape, Nitto Denko from Japan, one of the largest and most experienced manufacturers of adhesive tapes in the world authorized Vina Trade Synergy as official distributor of automotive painting masking tape No.7288 in Vietnam.|Technical specifications:
180˚ Adhesive strength
Should you have other specific requirements, please dont hesitate to let know. We can work closely with the manufacturer to bring you the product that best fits your purpose. You can contact us here for 24/7 free support.
Developed and applied by over 100 year-old Nitto Denko Group for Kobe steel factory in Japan for the first time in 1985, the “Made in Japan” Nitto Denko anticorrosion tapes have been used successfully across the world as a comprehensive corrosion prevention solution for pipelines, pipeline components (such complicated shape components as fittings and flange connections, U-bolt etc) and metal structures such as poles, bolts, nuts, valves, flanges etc both aboveground, outdoor and underground, in seawater environments.Now available and exclusively distributed in Vietnam by Vina Trade Synergy, serving the mission of protecting metal structures in factories, outdoor, underground and under seawater from severe corrosion, a must-have sustainable solution for factory and property owners/managers/operators.Specifically, lets see how it applies to telecom tower corrosion protection.
Painting and sealant applications are 2 important activities in construction finishing, having huge impact on the overall finishing quality of civil and industrial construction, in which masking tape plays an extremely important role in finishing quality of painting and sealant work. In this article, we will summarize key notes in surface preparation and masking tape selection for a perfect finishing edge of paint and sealant.
GENERAL FACTORS TO NOTE - CAUTIONS
Many elements are out of the manufacturers / distributors control such as:
The surface condition and substrate integrity at time of application & removal.
Environmental conditions on application & removal (especially temperature)
The age & condition of the tape, such as tape brand, where the tape is stored or any damage to the tape edges etc.
Has the tape been tested to assess fit for purpose & all preparation / application instructions been followed or if the tape is heat resistance masking tape type.
It is recommended not to expose Rubber based adhesive to harsh chemicals and solvents.
All sales of tapes have limited liability to replacement of tape, if proven to be faulty under the manufactures limited warranty.
Ensure all surfaces to be masked are free from dust, moisture, oils, grease, oxidisation, release agents and all other contaminants
If using a surface cleaner ensure that it is non-greasy & always use a clean cloth with no loose fibres or cloth particles.
Ensure that all surfaces are not flaky or damaged in any way that may cause tape application and removal issues.
“Aim for the best surface for the best result”
Select the correct tape to suit the application and conditions (especially for interior & exterior use) – for assistance please contact us.
On application roll off short lengths of tape while applying firm hand pressure. This will ensure accurate, clean paint edges with no paint bleed. DO NOT stretch the tape while applying.
Tools can be used to ensure tape surface contact, such as plastic applicators & painters knifes.
Application onto light moist surfaces can be difficult, ensure the correct masking tape is selected and then test to confirm suitability.
If the masking tape is applied for extended time periods, it is recommended to regularly check small sections to assess any adhesive transfer issues. Especially if the tape is exposed to direct UV light for lengthy time periods.
Tape removal waiting times
• Once you have finished painting, allow the paint surface to dry before removing the tape.
• How long you wait will depend upon on the drying time of your paint product – it must be touch dry.
• If painting more than one coat it is advised to wait till the last coat has sufficient time to dry before removal.
• Remove tape at air temperatures of between +15c to +40c
• The removal at higher temperatures increases the risk of adhesive transfer & at colder temperatures; the tape is more brittle with the potential for tape tearing.
• Ensure that the masked substrate temperature is at least +10c on removal, this will also assist in reducing any tape tearing or residue issues.
Remove at an angle
• Recommended to remove the tape back onto itself at an approx. 45 angle, this will assist with any residue issues and a cleaner edge.
• If any adhesive is removing try a 90 angle, also if any paint is coming away with the tape use the edge of a painter’s knife while removing.
Slow & Steady Removal
• Adhesive tapes must be pulled off slowly, steadily & never in jerks, this will reduce the risks with adhesive residue issues & tape tearing. A heavy coating of paint on the tape edge could cause tearing, be aware to try and limit the amount of paint build up in this case. If the adhesive is facing the direct sunlight (UV rays), this can cause adhesive residue issues on removal. Be sure to select our premium acrylic adhesive to limit any issues in this case.
• It is very important to remove the masking tape when the paint is dry not wet and/or sealant not completely cured.
Recommend that tapes be stored in the original packaging under dry conditions.
Ideally at room temperature but not warmer than +30c.
High relative humidity & direct sunlight to be avoided at all costs.
Ensure tape edges are not damaged or dirty this can cause tape tearing on application and removal.
General storage timeframe of 12 months from manufacture applies.
If adhesive residue is left behind first try using soap and warm water to remove it.
A hair dryer is often used to loosen the adhesive (especially rubber based adhesive types).
Remove as much adhesive as possible by either rubbing the adhesive off with your fingers, or using a higher tack masking tape over the top of the affected area and pulling it up off the surface.
Often recommended to test is window cleaners or citrus based cleaners (be sure to test on a small section first to assess any adverse effects).
Ensure to use a clean cloth when cleaning or removing any adhesive.
Most window manufactures recommend the following concerning powder coated window frames and adhesive residue issues – first try to remove with soapy water solution or test with turps based products.