Gates Mectrol
 
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N. America +1 (603) 890-1515
Europe +49 (0) 6157-9727-0
Mexico +52 (552) 000-2700
You can contact an Application Engineer at any time!

Here is a list of questions frequently asked by our customers, and their answers:

Should I discuss my application paramenters with Gates Mectrol before I design my belt and pulley components?
What is the temperature range that Gates Mectrol timing belts can operate under?
When should I use KEVLAR® instead of steel?
Does the use of V-guides or backings affect the minimum pulley diameter?
Do vacuum belts with holes have reduced tensile strength?
Can profiles be produced in various durometers?
Why use a polyurethane timing belt vs. other types of timing belts?
Are urethanes approved for food contact?
Are materials other than urethane available?
What kind of chemical environment can urethane belts be used in?
How does urethane compare to other elastomeric materials?
Why use nylon on the tooth or back side of the belt?
What is the conductivity of Gates Mectrol's antistatic belt?
What is the best material to use for a slider bed?

Should I discuss my application paramenters with Gates Mectrol before I design my belt and pulley components?

Yes, Gates Mectrol's applications engineers deal with a multitude of applications daily and their broad experience can be of help to you in arriving at a design that is the most efficient for your application and for us to manufacture.

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What is the temperature range that Gates Mectrol timing belts can operate under?

Our Standard urethane will operate within -5°C(+23°F) to +70°C(+158°F). Intermittent temperatures in excess of these limits should be discussed with Gates Mectrol before use. It is possible under some curcumstances to operate outside of these limits.

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When should I use KEVLAR® instead of steel?

There are several considerations that can affect the choice of KEVLAR® vs. steel:
a. Use of a metal detector around the belt
b. Most food applications prefer KEVLAR® vs. steel
c. KEVLAR® is not susceptible to corrosion in a high moisture environment
d. On a perforated vacuum belt, if the cords are cut, KEVLAR® is less likely to get pulled into the vacuum chanber and cause damage.
e. On high speed applications, KEVLAR® will not generate any electrical interference.

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Does the use of V-guides or backings affect the minimum pulley diameter?

Yes, both V-guides on self tracking belts and belts with backings require larger pulley diameters. Please see the self tracking belt and backings specifications areas of this site for information on pulley diameters.

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Do vacuum belts with holes have reduced tensile strength?

Yes, normally the holes that are punched in vacuum belts cut the cords in that area of the belt, reducing the overall tensile strength of the belts. It is possible to produce belts which have the cords grouped in areas so that they do not fall in the perforation pattern. This leaves the overall strength intact. Please consult an applications engineer for specific information and minimum quantity information.

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Can profiles be produced in various durometers?

Yes, Gates Mectrol has two standard durometers; 83 shore A, and 92 shore A. Other material durometers are available on request for an additional charge.

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Why use a polyurethane timing belt vs. other types of timing belts?

Polyurethanes have unsurpassed abrasion resistance versus other plastics (See Comparative Abrasion Resistance Chart
). Urethane will not abrade particles which can contaminate critical components in your drive, your product or your environment.

Relatively hard urethanes still maintain good flexibility without the use of a plasticizer. This equates to a stiffer overall system versus using a rubber belt such as neoprene. Urethanes can maintain this flexibility over a significant temperature range (-30°C to 80°C with short term to 120°C). Urethane also does not harden and degrade with age to the degree that neoprene does. Urethanes are highly elastic and tough which helps them to absorb shock and impact.

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Are urethanes approved for food contact?

Gates Mectrol offers belts utilizing a FDA/USDA grade polyadipate urethane. This urethane complies with FDA regulation 177.2600 and Gates Mectrol's timing belts are listed by the USDA as being approved for food contact.

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Are materials other than urethane available?

Gates Mectrol can manufacture timing belts our of a variety of materials including thermoplastic rubber, Hytrel®, etc. Contact an applications engineer concerning your specific needs.

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What kind of chemical environment can urethane belts be used in?

Urethanes are generally resistant to ozone, hydrocarbons, fats, oils, greases, room temperature water. They are generally attacked by concentrated acids, ketones, esters, chlorinated compounds, nitro hydrocarbons and high temperature water. Some chemicals known to attack urethane can still be used with Gates Mectrol's belt depending on the relative concentration, temperature and duration of the chemical exposure. Since Gates Mectrol cannot control the environment under which a belt is used, it is up to the customer to ultimately determine the appropriateness of the belt under their exact conditions.

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How does urethane compare to other elastomeric materials?

See General Description of Common Materials
and Comparison of Material Properties.

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Why use nylon on the tooth or back side of the belt?

Neoprene belts utilize a nylon fabric on the tooth side of the belt in order to enhance the shear strength of the neoprene tooth and to increase the abrasion resistance.

Nylon on the teeth is used on a urethane belt to reduce the coefficient of friction of the belt as it slides along a slider bed for conveying, and in some cases to reduce the noise generated between the belt and the pulley in a relatively high speed application.

Nylon on the back is used on a urethane belt to reduce the coefficient of friction accumulation applications where product must slide on the back of the belt or for other applications where low friction is desirable on the back of the belt.

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What is the conductivity of Gates Mectrol's antistatic belt?

The coating that is applied to Gates Mectrol's timing belts to make them antistatic has a surface resistivity of less than 106 ohms/square.

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What is the best material to use for a slider bed?

The lower the coefficient of friction the better. If a metal slider bed is used then it should have a fine finish. UHMW is inherently a low friction material with reasonable abrasion resistance.

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DuPont™ and KEVLAR® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company


 
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