Please look below for answers to frequent questions. If you don't see your issue addressed here, drop us a line for personalized help.

About TWP Inc

International Orders


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Quoting and Pricing

RFI Shielding Information



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What is mesh?

Mesh, also called mesh count, is the number of openings in a linear inch measured from the center of one wire to a point one inch distant. To determine the mesh, count the number of openings from the center of any one wire to the center of a parallel wire one inch away.

To measure coarse mesh simply lay a ruler on it and count the number of openings along a one inch length.To measure finer meshes a mesh counter or optical comparator may be needed.

How will you ship my order and what will my freight charges be?

Unless you specify a carrier, we will choose the best carrier based upon the weight, the urgency, product and destination.

Normally we ship via UPS (United Parcel Service) or FED EX for packages up to 150 pounds. They offer various levels of delivery from Next Day Air to about seven day service. We have daily UPS and FED EX pick up services and can provide excellent tracking.

For bulky packages and weights over 150 pounds, we ship via truck:

  1. Fed Ex Freight 
  2. Old Dominion

These truck companies give us over 80% discounts that we are able to pass on to you. You can also contact TWP and we will help you estimate your freight charges and transit time.

International shipment information is addressed in another FAQ.

What is your minimum order?

Wire mesh minimum order policy:
Standard Mesh Materials: $100.00
Wire Mesh Discs and Special Shapes and Slit Widths: $200.00
Custom Weaving: $1500.00

International Orders: Same as above (if UPS/ FED EX or truck shippable)

The TWP website can only calculate shipping options for destinations within the US and Canada; Any other freight charge that appears on an order form is an error.

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Can I get a sample?

TWP will gladly provide samples for your testing and inspection.

The charge for samples is $10.00 each plus shipping (Note: Unless otherwise specified, samples will ship USPS).

All samples will be charged to your Visa/MasterCard/Amex/Discover at the time of shipping.

Samples and Sizes
Galvanized, Stainless Woven and Welded, Brass, Bronze and Copper, Aluminum, Plain Steel

  • 8 mesh and coarser: The sample size is 6 inch X 6 inch.
  • 10 mesh and finer: The sample size is 3 inch X 3 inch. (EXCEPTION 635 X 635 mesh sample size is 1 inch X 1 inch)
  • The Sintered (thermobonded) sample size is 1 inch X 1 inch. (EXCEPTION 5-Layer sample size is 6 inch X 6 inch for $100.00)
  • The Monel sample size is 2 inch x 2 inch for $18.00.
  • The PTFE Coated Stainless sample size is 1 inch x 1 inch for $18.00.

If you need larger pieces of material, contact us for a quote.

You can select samples from any of our listed meshes. Expedited shipping is available for an additional charge.

How do you handle international shipments?

We ship internationally on a regular basis including Canada.

Pricing: All listed prices are FOB Berkeley, California, USA. For large shipments, we can quote CIF or FOB destination according to Incoterms 1990 in US dollars.

The TWP website can only calculate shipping options for destinations within the US and Canada.  Any other freight charge that appears on an order form is an error.

Terms: Payments must be made in US funds in advance unless other arrangements have been agreed upon. The buyer is responsible for all brokerage fees, taxes,and duties. We can accept payment by VISA, MasterCard, American Express, Discover, Bank Transfer, or Paypal.

How is the mesh sold - In flat sheets or on rolls?

Both woven and welded wire mesh is produced on 100 foot long (30 M) rolls. Rolls are usually either 36 inches (914 mm) wide or 48 inches (1220 mm) wide. We sell our mesh as either full or partial rolls. The one exception is our sintered mesh THERMOBOND™ that is produced as flat sheets up to 48 inches x 24 inches.

We also supply mesh discs and narrow widths.

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Can you supply material certifications?

Yes, they can be supplied. Please advise us at the time of ordering if you require material certifications or other documentation. No certifications will be available more than 90 days after shipment.

Our ISO 9001 quality system requires that all wire mesh items have a lot traceability back to the base material from which the items were made. Making traceability a competitive advantage, instead of burden.

TWP also offers ISO 9001 certified wire mesh fabrication services.

How long has TWP inc. been in business and where are you located?

TWP has been in business since 1969. We are headquartered in Berkeley, California USA which is in the San Francisco Bay area. We are affiliated with over 20 other suppliers, weavers and welders worldwide.

Can I get a special mesh that I don't see listed on your website?

Yes, many items are available as a special order. Generally, these special orders would be subject to a minimum order of $500 US dollars.

Contact us with your special requirements.

What is a micron and how big is it?

It is a unit of length in the metric system. One micron is equivalent to 0.00003937 of one inch.

I have no idea what mesh I need. How do I find it?

Our website contains considerable technical information and photographs to assist you and we will attempt to supply you with the wire mesh you specify. However, we cannot recommend a particular wire mesh for specialized applications. We need to be given a specific mesh description or sample in order to proceed. If you are still uncertain, we suggest that you contact an engineering consultant in your field. Another possibility would be for you to purchase samples from us to determine their suitability.

What is a "Square Foot" and a "Linear Foot"?

A square foot is a unit of measurement of area. A piece of material measuring 12 inches by 12 inches is one square foot. To compute the number of square feet in a piece of wire mesh you multiply its width in feet times its length in feet. For example, a piece of wire mesh 4 feet wide and 3 feet long would be 12 square feet.

Most wire mesh is priced by the square foot.

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A linear foot is a unit of measurement of length. A piece of material measuring, for example, 3 feet wide by 15 feet long would be 15 linear feet. The same piece of material could be described as 45 square feet; 3 feet wide X 15 linear feet which equals 45 square feet. Note: sometimes the term "running foot is used to mean linear foot".

What is the difference between woven and welded mesh?

Woven mesh is produced by the process of weaving, that is, by passing wires alternately over and under each other.

Welded mesh is a grid formed of wires that are fused together at their junctions. It is produced on automatic welding looms by accurately positioning the short (weft) wires over the long (warp) wires and spot welding their intersections (not over and under, as in ordinary weaving).

Does TWP just sell to large companies?

TWP Inc. is a small sized company and has a wide customer base that includes both small end users and Fortune 500 companies.

TWP Inc's website says that woven meshes conform to ASTM E 2016 - 15 . What is this specification and how can I get a copy of it?

This specification covers industrial woven wire fabric, referred to as wire cloth, for general use including the separation of particles. Wire cloth can be made of any primary metal or metal alloy wire that is suitable for weaving.

You may purchase a copy of this certification directly from ASTM (American Society of Testing Materials) from their website.

I have a complicated RFI Shielding application, can I get expert advice from TWP?

Twp does not provide RFI shielding engineering services. Please consult an engineer in this field.

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Where will my order ship from?

Your orders will ship out of Berkeley, California 94710. 

I have a sample of the mesh I need but I don't know how to describe it, can you help me?

Yes, send us the sample and we will contact you with the results of our examination.

What about your Discounted Mesh page?

These special offers are overstock items, unusual meshes, and distressed quality materials which may provide you with a special opportunity.

Se Habla Español?

Si, tenemos varias personas bilingues en nuestra empresa. Podemos recibir llamadas, correos electronicos y faxes en Español para su convenencia.

Can you "Blind Ship" direct to my customer without revealing that TWP is the source?

TWP has always performed this "Blind Ship" service. Please let us know if you require this service. Our meshes and packaging are marked with generic labels so as not to reveal TWP's name to your customers. Extra charges may apply.

Does TWP sell through distributors?

Within the United States TWP Inc sells directly without using distributors.

Can I get a formal quotation?

When needed, we can provide you with a formal quote by fax or email.

Can I cut this mesh myself?

In the comments section which accompanies each mesh photo, we state what is needed to cut each mesh to size (scissors, tin snips, etc.)

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What is Thermobond™?

Thermobond™ is a trademark that applies to TWP's sintered (diffusion bonded) meshes. These meshes are used in special applications where non fraying, bonded mesh is required.

I want to sift or size a solid. What kind of mesh should I use?

Sifting and sizing is generally done using a plain square weave woven mesh or a welded stainless mesh. Archeological digs have used our galvanized meshes for sifting purposes. Twilled weaves are not suitable for sizing or sifting because they do not have straight through holes.

What does Absolute Filtration Rating mean.

Absolute Filtration Rating:
A measure of retention, expressed in microns, that specifies the equivalent diameter of the smallest particle from which the filter has a retention of 100%. In actual practice, most manufacturers assign absolute ratings on the basis of retention in the range from 98% - 99.999999%.

What shape is the opening in a Dutch Weave?

There are no straight through square openings in a dutch weave and the filtrate follows a tortuous path through the triangular passages in the mesh.

What does your "opening in in microns nominal" mean?

A nominal filter rating is a measure of retention, expressed in microns, that specifies the equivalent diameter of the smallest particle for which the filter has a retention somewhere in the range of 60-90%.

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Can I receive a catalog?

TWP no longer publishes a paper catalog. Our website serves as our catalog.

Can I get same day shipment?

Sometimes. We must get your order no later than 10:00 AM Pacific Time. Please contact our office if you have any questions regarding delivery and processing times. 

Will I be charged sales tax

You will be liable for sales tax unless you are outside of California, Government Agency or other tax exempt organization, or have a resale certificate covering the goods ordered.

What are your business hours?

Normal business hours are 8:00 AM to 4:00 PM Pacific Time Monday through Friday. We also have 24/7 fax, email, and voicemail services.

Can I walk-in and purchase from TWP?

No. TWP is not able to handle walk-in customers. We accept phone, fax and e-mail orders only.


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