Standard Test Methods for Shear Adhesion of Pressure ...
Standard Test Methods for Shear Adhesion of Pressure ...
ASTM License Agreement
IMPORTANT- READ THESE TERMS CAREFULLY BEFORE ENTERING THIS ASTM PRODUCT.
By purchasing a subscription and clicking through this agreement, you are entering into
a contract, and acknowledge that you have read this License Agreement, that you understand
it and agree to be bound by its terms. If you do not agree to the terms of this License Agreement,
promptly exit this page without entering the ASTM Product.
For more information, please visit our website.
1. Ownership:
This Product is copyrighted, both as a
compilation and as individual standards, articles and/or documents ("Documents") by ASTM
("ASTM"), 100 Barr Harbor Drive, West Conshohocken, PA - USA, except as may be
explicitly noted in the text of the individual Documents. All rights reserved. You
(Licensee) have no ownership or other rights in the ASTM Product or in the Documents.
This is not a sale; all right, title and interest in the ASTM Product or Documents
(in both electronic file and hard copy) belong to ASTM. You may not remove or obscure
the copyright notice or other notice contained in the ASTM Product or Documents.
2. Definitions.
A. Types of Licensees:
(i) Individual User:
a single unique computer, with an individual IP address;
(ii) Single-Site:
one geographic location or to multiple
sites within one city that are part of a single organization unit administered centrally;
for example, different campuses of the same university within the same city administered centrally.
(iii) Multi-Site:
an organization or company with
independently administered multiple locations within one city; or an organization or
company located in more than one city, state or country, with central administration for all locations.
B. Authorized Users:
any individual who has subscribed
to this Product; if a Site License, also includes registered students, faculty or staff member,
or employee of the Licensee, at the Single or Multiple Site.
3. Limited License.
ASTM grants Licensee a limited,
revocable, nonexclusive, non-transferable license to access, by means of one or more
authorized IP addresses, and according to the terms of this Agreement, to make the uses
permitted and described below, each ASTM Product to which Licensee has subscribed.
A. Specific Licenses:
(i) Individual User:
(a) the right to browse, search, retrieve, display and view the Product;
(b) the right to download, store or print single copies of individual Documents, or portions of such Documents, solely for Licensee's own use. That is, Licensee may access and download an electronic file of a Document (or portion of a Document) for temporary storage on one computer for purposes of viewing, and/or printing one copy of a Document for individual use. Neither the electronic file nor the single hard copy print may be reproduced in anyway. In addition, the electronic file may not be distributed elsewhere over computer networks or otherwise. That is, the electronic file cannot be emailed, downloaded to disk, copied to another hard drive or otherwise shared. The single hard copy print may only be distributed to others for their internal use within your organization; it may not be copied. The individual Document downloaded may not otherwise be sold or resold, rented, leased, lent or sub-licensed.
(ii) Single-Site and Multi-Site Licenses:
(a) the right to browse, search, retrieve, display and view the Product;
(b) the right to download, store or print single copies of individual Documents, or portions of such Documents for the Authorized User's personal use, and to share such copies with other Authorized Users of Licensee within Licensee's computer network;
(c) if an educational institution, Licensee is permitted to provide a hard copy of individual Documents to individual students (Authorized Users) in a class at Licensee's location;
(d) the right to display, download and distribute hard copies of Documents for training Authorized Users or groups of Authorized Users.
(e) Licensee will undertake all necessary authentication and verification processes to ensure only Authorized Users can access the ASTM Product.
(f) Licensee will provide ASTM with a list of authorized IP (numeric IP domain addresses) addresses and, if Multi-Site, a list of authorized sites.
B. Prohibited Uses.
(i) This License describes all permitted uses. Any other use is prohibited, is a violation of this Agreement and can result in immediate termination of this License.
(ii) An Authorized User may not make this Product, or Documents, available to anyone other than another Authorized User, whether by Internet link, or by permitting access through his or her terminal or computer; or by other similar or dissimilar means or arrangements.
(iii) Specifically, no one is authorized to transmit, copy, or distribute any Document in any manner or for any purpose except as described in Section 3 of this License, without ASTM's prior express written permission. In particular, except as described in Section 3, no one may, without the prior express written permission of ASTM: (a) distribute or forward a copy (electronic or otherwise) of any article, file, or material obtained from any ASTM Product or Document; (b) reproduce or photocopy any standard, article, file, or material from any ASTM Product; (c) alter, modify, adapt, or translate any standard, article, file, or material obtained from any ASTM Product; (d) include any standard, article, file, or material obtained from any ASTM Product or Document in other works or otherwise create any derivative work based on any materials obtained from any ASTM Product or Document; (e) impose any charge for a copy (electronic or otherwise) of any standard,article, file, or material obtained from any ASTM Product or Document, except for normal printing/copying costs where such reproduction is authorized under Section 3; or (f) systematically download, archive, or centrally store substantial portions of standards, articles, files, or material obtained from any ASTM Product or Document. Inclusion of print or electronic copies in coursepacks or electronic reserves, or for distance learning use, is not authorized by this License and is prohibited without ASTM's prior written permission.
(iv) Licensee may not utilize the Product, or access to the Product, for commercial purposes, including but not limited to the sale of Documents, materials, fee-for-service use of the Product or bulk reproduction or distribution of Documents in any form; nor may Licensee impose special charges on Authorized Users for use of the Product beyond reasonable printing or administrative costs.
C. Copyright Notice. All copies of material from an ASTM Product must bear proper copyright notice in ASTM's name, as shown in the initial page of each standard, article, file or material. Obscuring, deletion or modification of the copyright notice is not permitted.
4. Detection of Prohibited Uses.
A. Licensee is responsible for taking reasonable measures to prevent prohibited uses, and promptly notify ASTM of any infringements of copyright or prohibited use of which Licensee becomes aware. Licensee will cooperate with ASTM in investigating any such prohibited uses and will take reasonable steps to ensure the cessation of such activity and to prevent any reoccurrence.
B. Licensee shall use all reasonable efforts to protect the Product from any use that is not permitted under this Agreement, and shall notify ASTM of any use of which it learns or is notified.
5. Continued Access to Product.
ASTM reserves the
right to terminate this License, upon written notice, if Licensee materially breaches
the terms of this Agreement. If Licensee fails to pay ASTM any license or
subscription fees when due, ASTM will provide the Licensee with a 30-day period within
which to cure such breach. No cure period will be provided for material breaches
relating to violations of Section 3 or any other breach likely to cause ASTM irreparable
harm. If Licensee's subscription to an ASTM Product terminates, further access to
the online database will be denied. If Licensee or Authorized Users materially breach
this License or make prohibited uses of material in any ASTM Product, ASTM reserves the
right to deny Licensee any access to the ASTM Product, in ASTM's sole discretion.
6. Delivery Formats and Service.
A. Some ASTM Products use standard Internet HTML format. ASTM reserves the right to change such format upon three [3] months' notice to Licensee, although ASTM will make reasonable efforts to use commonly available formats. The Licensee and the Authorized Users are responsible for obtaining at their expense suitable Internet connections, Web browsers, and licenses for any software necessary to view the ASTM Products.
B. The ASTM Products are also available in Adobe Acrobat (PDF) format to Licensee and its Authorized Users, who are solely responsible for installing and configuring the appropriate Adobe Acrobat Reader software.
C. ASTM shall use reasonable efforts to make online access available on a continuous basis. Availability will be subject to periodic interruption and downtime for server maintenance, software installation or testing, loading new files, and reasons beyond the control of ASTM. ASTM does not guarantee access, and will not be liable for damages or refunds if the Product becomes unavailable temporarily, or if access becomes slow or incomplete due to system back-up procedures, Internet traffic volume, upgrades, overload of requests to servers, general network failures or delays, or any other cause that may from time to time make the Product unavailable for the Licensee or Licensee's Authorized Users.
7. Terms and Fees.
A. The term of this Agreement is _____________ ("Subscription Period"). Access to the Product is for the Subscription Period only. This Agreement will remain in effect thereafter for successive Subscription Periods so long as annual subscription fees, as such may change from time to time, are paid. Licensee and/or ASTM have the right to terminate this Agreement at the end of a Subscription Period by written notice given at least 30 days in advance.
B. Fees:
8. Verification.
ASTM has the right to verify compliance
with this Agreement, at its expense, and at any time during the course of normal business
hours. To do so, ASTM will engage an independent consultant, subject to a confidentiality
agreement, to review Licensee's use of ASTM Product and/or Documents. Licensee agrees to
permit access to its information and computer systems for this purpose. Verification
will take place upon no less than 15 days notice, during normal business hours and in
a manner that does not interfere unreasonably with Licensee's operations. If
verification reveals unlicensed or prohibited use of the ASTM Products or Documents,
Licensee agrees to reimburse ASTM for the costs incurred in verification and reimburse
ASTM for any unlicensed/prohibited uses. By invoking this procedure, ASTM does not waive
any of its rights to enforce this Agreement or to protect its intellectual property by
any other means permitted by law. Licensee acknowledges and agrees that ASTM may imbed
certain identifying or tracking information in the ASTM Products available on the Portal.
Cell Instruments Product Page
9. Passwords:
Licensee must immediately notify ASTM
of any known or suspected unauthorized use(s) of its password(s), or any known or suspected
breach of security, including the loss, theft unauthorized disclosure of such password
or any unauthorized access to or use of the ASTM Product. Licensee is solely responsible
for maintaining the confidentiality of its password(s) and for ensuring the authorized
access and use of the ASTM Product. Personal accounts/passwords may not be shared.
10. Disclaimer of Warranty:
Unless specified in this Agreement,
all express or implied conditions, representations and warranties, including any implied
warranty of merchantability, fitness for a particular purpose or non-infringement
are disclaimed, except to the extent that these disclaimers are held to be legally invalid.
11. Limitation of Liability:
To the extent not prohibited by law,
in no event will ASTM be liable for any loss, damage, lost data or for special, indirect,
consequential or punitive damages, however caused regardless of the theory of liability,
arising out of or related to the use of the ASTM Product or downloading of the ASTM Documents.
In no event will ASTM's liability exceed the amount paid by Licensee under this License Agreement.
12. General.
A. Termination:
This Agreement is effective until
terminated. Licensee may terminate this Agreement at any time by destroying all copies
(hard, digital or in any media)of the ASTM Documents and terminating all access to the ASTM Product.
B. Governing Law, Venue, and Jurisdiction:
This
Agreement shall be interpreted and construed in accordance with the laws of the
Commonwealth of Pennsylvania. Licensee agrees to submit to jurisdiction and venue in
the state and federal courts of Pennsylvania for any dispute which may arise under this
Agreement. Licensee also agrees to waive any claim of immunity it may possess.
C. Integration:
This Agreement is the entire agreement
between Licensee and ASTM relating to its subject matter. It supersedes all prior or
contemporaneous oral or written communications, proposals, representations and warranties
and prevails over any conflicting or additional terms of any quote, order, acknowledgment,
or other communication between the parties relating to its subject matter during the term
of this Agreement. No modification of this Agreement will be binding, unless in writing
and signed by an authorized representative of each party.
D. Assignment:
Licensee may not assign or transfer
its rights under this Agreement without the prior written permission of ASTM.
E. Taxes.
Licensee must pay any applicable taxes,
other than taxes on ASTM's net income, arising out of Licensee's use of the ASTM Product
and/or rights granted under this Agreement.
How to Choose the Right VHB Tape for your Application
In the world of pressure sensitive adhesive (PSA) tapes, there exists a subset of tapes known as high bonding tapes, also known by the ubiquitous 3M&#; trade name, VHB&#;. These tapes are ideal bonding solutions in applications where metal fasteners, welds and other liquid adhesive solutions are typically specified. Because of their strength and durability, VHB tapes are a permanent bonding solution. They are ideal for a variety of applications and can be used with many different types of substrates. Because of their versatility, and the many types of VHB tapes available, you have a choice when it comes to the specific tape you use.
What factors should you consider when choosing a VHB tape for your application? Not sure if VHB tapes are even right for you? Find out more about these high-strength PSA tapes and how you can make the best decision for your adhesive tape needs.
What are VHB Tapes?
VHB tapes are industrial PSA tapes that are high performance adhesives laminated to either side of an acrylic foam core pressure sensitive adhesive. They are widely used because of their ease of application, clean aesthetic appeal, and their ability to withstand dynamic loads. Besides their impressive bonding strength, there are many reasons why VHB tapes can be the best bonding solution for your application (see some of the common applications of VHB tapes here):
Durability VHB tapes can withstand decades of extreme temperatures, high impacts and shock, water/moisture, vibration, and UV and humidity. They are ideal for use in many environments. With its natural viscoelasticity, VHB is able to absorb dynamic loads by distributing stress across the entire bond area, VHB tapes can withstand vibration, absorb impacts and compensate for thermal expansion and contraction of bonded parts.
Bond thinner, different substrates: VHB tapes can join materials ranging from aluminum and steel to glass, plastics, and even painted and powder-coated surfaces. Because the tapes are double-sided, they can also join dissimilar substrates with relative ease. This is particularly useful when trying to prevent corrosion between different types of metals. Unlike mechanical fasteners and welding, a specific substrate gauge is not required for use, so you can specify thinner lighter substrates.
Aesthetics: Without having to design around unsightly rivets and fasteners and expanding your substrate choices for material and gauge, designing beautiful products becomes easy.
Save costs: Eliminate labor time, redeploy highly skilled welders, and reduce production mess.
The Factors to Consider When Choosing VHB Tapes
As with any PSA tape, there are many things you should take into account when choosing among the many VHB tape options available to you.
The Joint Design and Bond Stress
There are many forces that can be placed on the bond and joint (see a breakdown of them here). It&#;s crucial to understand how the joint is positioned and which types of stress will be acting on it. Some questions to consider when designing a joint are:
What type and how much dead load and dynamic stresses with the bond see?
Are there opportunities to minimize dead load on the tape?
How can you minimize the most challenging forces like cleavage, peel stress
How can you design/change the joint to account for the required tensile strength or shear strength?
What is the surface area available for bonding?
The Substrates Being Bonded
Understanding how different adhesive tapes react with different substrates is crucial to the performance and longevity of your bond. While VHB tapes adhere well to everything from metals to glass and high surface energy materials, it&#;s important to know which specific VHB tapes to use with each substrate.
Consider the surface energy of your substrate. High surface energy materials include aluminum, steel, plastics, powder coated surfaces, etc. Medium surface energy materials include ABS, Polycarbonate and PVC. Low surface energy materials like Polyethylene and polypropylene Material Texture (smooth, grainy etc.)
For the best overall performance on metals, many paints, and medium surface energy plastics, it&#;s wise to test these tapes:
For more challenging powder-coated paint substrates it makes sense to evaluate the softer tapes:
If you are working with the most difficult to bond to substrates like polyethene and polypropylene you may choose to use one of the above tapes along with Primer 94 or instead, leverage an exciting new addition to the VHB tape family, 3M&#; VHB&#; LSE Tape Series.
The Thickness and Quantity of the VHB Tape
Tape thickness is highly dependent on the mismatch between the two surfaces being bonded. Thinner tapes can be used when one of the two substrates is thinner. As a general rule, the VHB tape should be target 50% of the thickness of the thinnest rigid substrate being bonded. If you are in between tape thicknesses, it is probably better to use the thicker tape. So, for example, if you have a 40 mil thick ABS plastic you are bonding, it will likely be a more robust bond using the 25-mil thick 3M VHB Acrylic Foam Tape instead of the 15-mil 3M VHB Acrylic Foam Tape. Using too thick a tape for the application can also degrade performance
It&#;s also important to consider the thermal expansion/contraction or movement in the joint. The expansion or movement of the joint should not exceed three times the thickness of the tape. Use thicker tapes if higher expansion/contraction or movement is predicted.
The size and weight of the parts being bonded together will determine how much tape needs to be used. Consider things like the shear stress that will be put on the tape (e.g., in applications that hold a panel or hanging sign). It is common to design four square inches of tape per pound of dead load to avoid tape creep. For dynamic loads, page four on the Technical Data Page is a useful reference. It&#;s important to use the right amount of tape to distribute the force more evenly over the entire bond.
What is the Operating Environment?
The environment of the application is just as important as the substrates being bonded. Many VHB tapes perform well in a wide range of environments, but understanding the environmental hazards the tape will be subjected to will allow you to choose a tape that can withstand them.
The general operating temperature of most VHB tapes is as high as 200°F, but there are tapes with special properties that allow them to perform outside of this range. For example, the 3M VHB GPH Series Tapes can operate in temperatures of 300°F and for the short term can go through bake cycles of 450°F. Some other environmental factors to consider include exposure to humidity, UV light, and chemicals, solvents, or plasticizers.
The Application Constraints
Many tapes are used on assembly lines; they aren&#;t being applied in a clean laboratory setting. Keep in mind that tapes need to be applied correctly in order to minimize the chances of application failure. Some of the things that can cause VHB tapes to fail include:
Surface contamination: heavy oils, greases, water, dirt, and other solvents can impact adhesion, so make sure the application surface is clean and completely dry.
Application temperatures: as noted above, most VHB tapes must be bonded in temperatures above 50°F and below 100°F. While it is generally best to control this application temperature range, some VHB products, like 3M VHB Acrylic Foam Tape and 3M VHB Acrylic Foam Tape may be bonded in temperatures as low as 32°F.
Rate of strength build up requirements: VHB tapes build up to 45% of their overall strength with good bond line pressure upon application. The bond increases over time over several days. Typically, within 72 hours the bond should be close to reaching maximum strength.
Want more information on Tape Shear Adhesion Tester? Feel free to contact us.