Cord-ring spools, the best choice
What is a cord-ring?
Cord-ring is an extruded profile of calibrated circular section that is manufactured in the most common O-ring thicknesses. At JIOrings, we have cord-ring spools in stock ranging from 1 mm to 30 mm in bull rope diameter, in different lengths (spools of 5, 10, 25, 50, 100 and 200 metres). As if that were not enough, we also have the possibility of supplying spools with other technical characteristics upon request.
What is the cord-ring used for?
The cord-ring is an excellent solution for the static sealing of lids as it allows to build by seating the O-ring to the exact measurement required for each occasion.
Furthermore, O-rings can also be manufactured by hot vulcanization from the cord-ring. This makes it possible to manufacture virtually any O-ring dimension without the need to invest in an expensive mould for its manufacture. The O-ring made from a cord-ring represents a world of solutions with practically no restrictions. The cord-ring allows for from only one unit (in a multitude of materials, thicknesses and colours) the manufacture of the desired O-ring.
We have a wide range of cord-ring spools. Only in stock, we have more than 1,650 spools:
• Black NBR70 (Perbunan® Arlanxeo)
• Green FPM70 (Viton® Chemours)
• Black FPM75 FDA-approved (Viton® Chemours)
• Translucent VMQ 60 FDA-approved (Xiametre® Dow Corning)
• Red VMQ 70 FDA-approved (Xiametre® Dow Corning)
• Black EPDM70 FDA-approved (Keltan® Arlanxeo) for drinking water
• Black EPDM70 (Keltan® Arlanxeo)
• White EPDM70 FDA-approved (Keltan® Arlanxeo)
• Black CR70 (Neoprene® Dupont)
Approvals of our spool ranges
Some of these spools have the certifications required by the food, beverage and pharmaceutical industries, among others, such as the FDA approval or their use for drinking water.
Advantages of buying at JIOrings
We have one of the widest ranges of cord-spools in stock in the peninsula but we can also manufacture intermediate measures in short or medium series with a short delivery time, in different materials derived from rubber, with high quality standards and that meet with the technical requirements that each customer demands.
We are experts in sealing, we have more than 32 million sealing gaskets: 30 million O-rings (standard, encapsulated, custom-made…), 1 million quad-rings, 225,000 back-up rings (BUR), 200,000 v-rings, 70,000 bonded seals, 40,000 rotary shaft seals, 40,000 hydraulic seals, 25,000 wiper seals, 6,000 axial seals…
We supply all our seals with the highest level of quality, with an unbeatable customer service and fast and efficient delivery.
The importance of approvals
Day after day the O-rings have to meet more and more requirements in matters of environment and security. By the same token, public organizations impose more and more rigorous and restrictive requirements on materials or compounds that form the seals which are aimed to get in contact with water, gas, food products, chemistry products…
In JIOrings we are really committed to preserve the quality and security of the compounds that form our seals. In order to increase the value of our products, gain competitive advantage and develop a reliable brand, we are immersed in a continuous certification process that comprises the following points:
· Our own approvals: In this case we have different compounds with our own homologation as well as some others which are undergoing the process to be homologized.
· Our main suppliers’ approvals: As distributors we require of our suppliers all the certifications our clients need.
· In addition, in JIOrings, being distributors, we meet the standards of REACH regulation as well as the standards of RoHS directive.
Our own approvals
In some cases, when some compounds have been really successful (for instance, those compounds in stock offered in different measures or compounds which have been highly demanded by our clients), we decided to take a step forward and homologate the mixture (such as the food-grade silicone JA7006F-134662) on our own. That way we can provide our clients with a verified and warranted quality level according to the results obtained in the testing carried out by an independent laboratory. In these cases, the achievement of the homologation, as stated by the standards of the American agency FDA (Foods and Drugs Administration), implies that the technical file should have the original certification of the homologation.
In some other cases, we feel indebted to homologate a specific mixture due to the market’s demands. When we started the new stage of internationalization for our silicone plugs for wine barrels we soon realized that, beyond the quality of the pieces, we also had to pay attention to all the documentation related to the quality of the mixture we were about to provide to our buyers. In the first stage, we managed to get the FDA homologation, but as in some cases it turned out not to be enough, we got on to work. Thanks to the inestimable collaboration of Intertek, we achieved the BfR (Bundesinstitut für Risikobewertung – The German Federal Institute for Risk Assessment) certification, which meets the requirements of the European Union’s 1935/2004 regulation and it allows us to export our plugs all around the world, and with all the guarantees.
In general, laboratories require rubber samples that are called slabs. They are semi-finished pieces, in a standardized size that allow carry out some tests which are defined by the most common international regulations (ASTM, DIN, ISO, etc…). The aforementioned tests are executed under really strict conditions and they will be only homologated in case the results are within the established limits.
So far we have certified all the approvals on our own with the help of two close companies: the Technological Centre of La Rioja and the Intertek’s branch in Bilbao. However, we would not discard, in case it would be necessary, the help of a foreign laboratory for specific approvals, such as that of the drinking water.
And now, what?
We firmly believe that quality is an added value that JIOrings offer in each sale. We constantly work to ensure that our seals meet all quality, health, security, environment and social responsibility standards in nearly all markets. In addition, we are aware our clients appreciate the efforts we are making in the last years.
We inform you we have already updated the “Official Approvals” section in our web. You could find there a table where we indicate all the approvals by compounds. In case it is a specific mixture we homologated, you can download it automatically. In the other cases, however, we indicate the adequacy of the approvals for each mixture. This table contains information that we will be updating just as we get more approvals, be our own approvals, be approvals certified by our suppliers.
Back-up rings + O-Rings = 100% compatible
Some time ago we spoke about the O-Rings and how good they were when a risk of extrusion from the housing could exist. The O-Rings create the seal effect pressing against the housing parts that hold it, but the capacity of the ensemble depends basically on these three factors: (1) the correct choice of the O-ring, (2) the surface finishing of the housing and (3) the play between the elements.
When the O-Rings are called to exercise the seal in circuits in which the pressure reaches high levels, one of the risks to be considered is that of the ring extrusion from the housing. Such a risk is increased when the O-Ring compound is soft.
In order to avoid this risk we may rely on back-up rings (BUR), also known as anti-extrusion rings. The back-up rings are designed to guarantee a high level of seal performance in contact with the O-Ring. Otherwise said, they aim to protect the O-ring so that it may develop its task.
The choice of the right back-up ring lies in the following points which should be born in mind:
• The compounds chosen for the back-up rings must meet all of the compatibility requests of the fluids requested of the O-Rings.
• The hardness to support the other pressure loads must be suitable.
• The resistance to the usage and ageing must be high, to guarantee good performance for the entire life of the O-ring to which they are required to protect.
• The measure of the back-up ring, of course, must go with the O-ring that protects.
If the choice is the correct one the back-up ring will provide an excellent performance, as a back-up element for the piston and shank seals that may be generally found in hydraulic static circuits and hydraulic dynamic circuits. The back-up ring could be located in the rear or under the pressure of the sealing element which is holding, although there could also be different housings that hold two back-up rings, each from a different side of the O-ring.
At JIOrings we have NBR90 back-up rings according to the Parker® Standard:
From: -006 to -460 (ø3,56mm to 394,31mm).
Thickness: 1,14/1,24 1,14/1,35 1,02/1,27 1,52/1,93 2,44/2,97.
* Under request, we may provide different measures and other materials.
If you want to purchase them in our online store you can find them by product (BUR or Back-Up Ring) and size. You can also take the British Standard number that the O-ring has as a reference (for example, BS211) to search in the “Description”.
|Check stock in real time|
|Back-up rings||NBR||≤400||-20º to +100º|
When special manufacturing turns out to be the solution
At JIOrings, as in life, standard stuff is sometimes no longer worth it. When it happens that we cannot fulfill our client’s needs with any of our pieces from our large stock, it is necessary to create a special piece.
This kind of piece based on a drawing or sample is manufactured for a specific client and must meet some specific requirements. We design and develop pieces of specific manufacturing according to our client’s needs. Thanks to our experience and our partners (recognized laboratories and national and international factories) we can successfully tackle with great challenges.
The manufacturing process of special pieces at JIOrings aims to achieve our clients’ satisfaction. In the first phase, we examine each client’s needs: how the pieces will be like (hardness, compression set, elasticity, resistance), which applications will they have… We design a mold based on a drawing or sample provided by the client and we take into account the specifications of each piece. Once the mold has been made, we manufacture a pre-series which is sent to the client so that they might check it and make all the necessary proofs. In other words, we properly homologate the sample. Once the piece has been approved, we put all hands on deck and we start producing the special pieces that have been asked, without forgetting the deadlines and quantities.
There are many advantages for making special pieces at JIOrings:
- We examine each client’s needs and we offer a measured solution.
- We have more than 14 years experience in the sector.
- We manufacture molds or equipment at very low cost.
- We can produce special pieces in short edition.
- We manufacture pieces that meet required international norms (food, drinking water…).
These are some of the lately produced pieces that we have manufactured:
|Collar||FPM 70 SH A Green||
|Fuse holder attachment||VMQ 35 SH A Dielectric Red RAL-2001||
||A special mixture developed for fuse holders with special insulating features, low residual deflection, and with personalised hardness and colour.|
|Quad-Ring||EPDM 80 SH A Peroxide Black (4442-N69) for potable water||
||Included in assembly of pressurised tanks for the treatment of potable water.|
|Cap||Neopreno 50 SH A Black||
||Dust caps for compact gas cells.|
|O-Ring||EPDM 65 SH A||
||O-ring with a rectangular perimeter for pressure relief in gas cells.|
|Shaped seal||NBR 70 SH A Black||
||Sealing parts with a toroid cross-section for fluid control units which measure the oil that is being dispensed at each service point in an automobile repair shop.|
Aseptic seals are mainly used in chemical, pharmaceutical and food industries
Without any doubt, the main seal is the O-ring, the most known, worldwide used and, many other times, the seal JIOrings identifies itself with. Nevertheless, when it comes to chemical or pharmaceutical applications, aseptic seals provide tightness to the flange and the tube fitting as well as the necessary hygiene.
At JIOrings we offer a wide range of seals and each one is ready to use under any circumstance. Actually, seals may be extremely important in certain situations as the materials they have been manufactured with must be the appropriate ones for being used in biotechnological and pharmaceutical processes that required a high level of hygiene and asepsis. And there is exactly where our seals come into play.
Aseptic seals or Hygienic Seals are mainly used in chemical, pharmaceutical and food industries. These fields are normally highlighted because they manufacture and commercialize products in large scale, and if any were about to be modified, the product would turn out to be defective and almost useless.
For that reason, it is of paramount importance to use the best aseptic seal so that everything remains correct and precise in these industries. At JIOrings we offer the best aseptic seals: we make them in different materials, compositions and colors. All of them are homologized by the FDA norm and have the UPS Class VI certification; besides, there are many other homologations from important national and international suppliers.
On the one hand, we offer winged clamp seals (its wing prevent the seal from falling off when it is opened) and, on the other hand, we have D-Rings, available in different materials, such as EPDM, NBR, VMQ, FPM, CR, EPDM peroxide and PTEE.
If necessary, you can always get more information in order to get to know deeper our asepsis seals. However, if you want to require a quotation or shop directly you are in the best place.
If there is any gas, choose RGD, ED Resistant or AED seals
The O-ring, the most universal seal, is the most used seal in fluid-tights because of its excellent effectiveness-cost relationship. Simple as it may be, it can also be manufactured in many different materials and it has a wide range of uses. When it comes to choose the most suitable material, the fluid to be tightened and the temperature are elements of paramount importance to make the good choice. By the same taken, History has shown us that no failure must be allowed.
NASA’s Challenger Space Shuttle could be one of the most well-known and tragic cases, when it broke apart 73 seconds into its flight due to the wrong choice of an O-ring. The seals used in the shuttle were FKM seals, and they were not designed to fly under unusually cold conditions as in this launch, so the seals lost their elasticity. As a result, seals lost their capacity to return to their original shape after the foreseen movement and this led to the disaster.
Nowadays, more and more clients ask us for O-rings for different fields (such as pharmaceutical, aeronautic, chemist, biomedicine, drinking water, food, gas industry…) and applications with high standards. Indeed, we just want to highlight in this post the consequences of the gas that may result in because of a wrong choice, as high pressure applications need the right seal for being efficient.
The term RDG (Rapid Gas Decompression), also known as ED (Explosive Decompression), is one of the main causes for tight failures when using seals, especially in many high pressure processes. It is a phenomenon that occurs when a pressurized gas reaches the outside very quickly and makes rubber seals from the equipment fail.
To avoid this risk, at JIOrings we offer RGD, ED Resistant or AED (Anti-Explosive Decompression) O-rings which are specifically manufactured to prevent this failure from happening and endure the quick gas decompression. The most commonly used material for RGD certified O-rings is Viton® or FFKM®, but they can also be manufactured with different materials, such as HNBR, Aflas® or FFKM.
Metal-cased wipers, worldwide known as "wiper seals"
Wiper seals maintain sealing contact to the piston rod when the equipment is stationary (static, no reciprocating motion of rod) and in use (dynamic, reciprocating rod). Without a wiper seal, the retracting piston rod could transport contaminants into the cylinder, and that would be disastrous. If outsider contaminants enter the hydraulic system, the contaminated hydraulic fluid can rapidly wear away axels, block filters and damage mechanized surfaces.
Wipers or wiper seals are hydraulic seals. Hundreds of wipers can be found in the market, but we could make a clear division between flexible wipers and rigid wipers (also known as metal-cased wipers). The main difference between them is that flexible wipers (made of polyurethane or rubber) are assembled in closed cartridges whereas rigid wipers (made of polyurethane o rubber with an external metal reinforcement) are used in opened or semi-opened housings.
As the name clearly states, wipers are commonly used to wipe or scrape away dirt from axels or shaft as well as prevent external particles, shavings or humidity from entering the hydraulic cylinders. Indeed, wipers operate with a wide range of applications and environmental conditions, such as dust, countless residues and surrounding environment conditions.
Polyurethane wipers (with single lip static water-tightness) are used to prevent water or dirtiness from entering the housings. These hydraulic seals are most importantly used in mobile hydraulics or agricultural equipment. However, they can also be assembled in many other applications.
Even if wipers don’t function with pressure, they may be subjected to strong charges. Generally, metal-cased wipers tend to be more resistant than flexible wipers and they are normally assembled in opened or semi-opened housings. Once functioning, metal-cased wipers remain in the housing as its outside metal part, when contacting with the metal of the system, guarantee the perfect attachment.
At JIOrings, the quickest way to find a seal, we mainly distribute MW (NBR + steel) compositions for rigid wipers, ME1 (polyurethane + steel), ME2 (polyurethane + steel) and DH04 (polyurethane) for flexible wipers. In any case, in the standard stock section, you can view the wipers we generally have in stock in the warehouse. If you can’t find it, contact us without any doubt.
Throughout the year, more and more customers have been requesting spools of silicone cord-ring and as at JIOrings we love to satisfy your desires, we have decided to take the plunge… and in a big way!
Not only do we now have a large stock of spools manufactured in Xiametre® of the prestigious Dow Corning brand, but we also have spools available in Viton® original, of another presigious brand, Chemours. And because we never leave things half-done, we have applied to the CTR for the approval of both materials for use with food.
Quality, price and availability! Once again, we are indisputably the fastest way to find a seal.
Trade name: Xiametre® (Dow Corning)
Hardness: 70 SH A
Temperature range: -55 to +200 °C
Trade name: Viton® (Chemours)
Hardness: 75 SH A
Temperature range: -18 to +220 °C
How to use cord-ring
By joining the ends of the extruded cord-ring, you obtain O-rings with different measurements from the standard sizes. The process is simple, you just have to cut the length of the desired circumference and glue the ends together, previously overlapped at 45º. The cord-ring is usually used in cases of static sealing, large flanges or container lids, among other applications.
The cord-ring can be glued cold or warm-vulcanized. O-rings glued cold must respect the thermal and chemical limits of the glue and the characteristics of the elastomer and are used exclusively in static applications. In contrast, vulcanized O-rings can be used in dynamic applications.
The advantages of cord-ring make it a highly versatile option:
- Cost savings, because there is no need to manufacture moulds to obtain the desired O-ring from the the cord.
- There are no size limits for large diameters.
- Tolerances can be more accurate than in moulded rings.
- The rings obtained from the cord have no burrs.
- Faster manufacturing.
- Suitable for use with food, pharmaceutical and potable water.
Availability of Xiametre® Cord-Ring Spools
|Spool (m)||Thickness (mm)||Material||Hardness SH A||Color||Approvals|
Availability of Viton® Cord-Ring Spools
|Spool (m)||Thickness (mm)||Material||Hardness SH A||Color||Approvals|
Washers, square- or rectangular-section rings
We are going to dedicate this post to washers. Until now, we have been focusing on raising awareness of our different lines of seals month by month. We started this series of “one month, one seal” with the most common one of all, the o-ring. But we have also written about seals which, a priori, are not so well known, such as RB gamma seals. We have one of the largest stocks of seals on the peninsula and it is our objective to raise awareness of the products in our catalogue, both seals as well as washers.
Rubber washers are circular components with a hole in the centre. It is a very simple product that we at JIOrings can manufacture in different ways:
- Punched out of a sheet.
- Cut from a tube moulded or extruded.
Each production system has its advantages and distinctive features. In the case of washers manufactured by punching out of a sheet, we offer these pieces with a maximum diameter of 500 mm, and from a minimum thickness of 0.1 mm, in a range of hardnesses from 30 to 90 on the Shore A scale, and in any rubber (NBR, EPDM, silicone, food-grade silicone, etc.). In the case of washers cut from a tube (moulded or extruded), we can obtain these pieces with square edges, reducing the percentage of defects such as marks, notches, burrs, etc. Moulded washers allow us to offer these pieces suitable for more specific technical requirements (any material, size, colour, certification, etc.) than the other two systems.
The most common applications for these pieces are found in usage situations such as taps, plumbing, ironmongery, etc. although, in reality, we can find a washer anywhere there is a nut or a screw and a need to uniformly distribute the pressure applied by the nut o screw on the surface. We can also use these parts to avoid liquids leaking, ensure sealing, insulate, provide constant support, etc.
These are some of the advantages that parts can provide when used:
- Tight tolerances, particularly as regards thickness.
- Excellent price/quality ratio, particularly for medium-sized and large series.
- Smooth finish of the surface and the edges.
- No investment in moulds for the most standard sizes.
At JIOrings, we offer you a wide range of standard washers as well as made-to-measure moulded washers, washers which meet the need of a particular design, manufacturing tailored to your more specific needs (NO mould cost, NO minimum order). Request your quote or go to our online shop to make your purchase.
The encapsulated O-rings, the seals with an encapsulation that sets it apart
We have decided to give the encapsulated O-rings the importance they have always deserved, creating a specific area with its technical data sheet, 3D photos of the part both whole and in section, and a video of it in movement.
The encapsulated O-ring consist of a core in silicon (VMQ) or fluorocarbon (FPM) which is completely enclosed in a seamless FEP or PFA encapsulation. These seals are the ideal solution in the face of sealing problems given their chemical resistance, elastic properties, and low friction.
The encapsulated seals combine the resilience and sealing typical of elastomers with the chemical resistance of PTFE. Because they are made of a core of VMQ or FPM covered with a thin capsule of the polymers FEP or PFA, the result is a high-performance sealing product.
Because they are resistant to solvents and are chemically inert (except for contact with alkaline metals, fluorine, and some halogen compounds at high temperature), the encapsulated O-rings compensate for some of the limitations of traditional O-ring seals. On the one hand, they provide a level of resilience very similar to that of elastomers. And on the other hand, the extremely low coefficient of friction (0.1 and 0.2) of the polymer FEP allows for a very low permeability to gases. This means that encapsulated O-ring seals are almost universally used in harsh environments.
Due to all of these features, encapsulated O-ring are used above all in applications such as pumps and valves, marine motors, mechanical locking, filters, pneumatic motors, heat exchangers, autoclaves, pipelines, and compressors, among others.
The materials used for the covering of the seal are FEP and PFA, as we mentioned earlier. Their properties are similar although PFA displays better behaviour with temperatures in excess of 200 ºC. For any inquiries, do not hesitate to consult the technical data sheet:
|Encapsulated||FPM + FEP||-20 to +205 ºC|
|Encapsulated||VMQ + FEP||-60 to +180 ºC|
The seamless uniform FEP encapsulation provides the seals almost a universal sealing capability whilst the continuous reset and the constant pressure of the encapsulation onto the sealing point is performed by the core. As a result, there is a huge sealing compression that increases with media pressure.
In summary, the following are the main features of encapsulated O-rings:
- They offer a high chemical resistance.
- They function in a wide temperature window.
- They can withstand high-pressure-bearing situations.
- Their surface is low friction and has a low absorption of solvents.
- They enjoy high resistance to “COMPRESSION SET“.
- Their capacity for watertightness exceeds that of other seals.
- They can be described as being similar to an elastomer with a “teflon” coating.