Products / Silicone Weighing Bellows

Silicone Weighing Bellows

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Filcoflex silicone weighing bellows are integrated into the feeder of dosing and weighing systems to reduce the influence of vibration on the weighing apparatus.

Silicone weighing bellows act as a buffer, absorbing force from movement to preserve accuracy of results. This decoupling property also reduces stress downstream in the system and improves equipment longevity. Filcoflex silicone bellows have superior properties that make them popular with manufacturers: permanent elasticity, aging resistance, food safe, high heat resistance, and superior flexibility.
           
We offer silicone weighing bellows in multiple variations.
Silicone Weighing Bellows Translucent White (SIL BG W) 
Silicone Weighing Bellows

Silicone Weighing Bellows Translucent White (SIL BG W) 

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Silicone Weighing Bellows

Silicone Weighing Bellows Asymmetrical Conical White (SIL BG AC W) 

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Silicone Weighing Bellows

Silicone Weighing Bellows Antistatic Black (SIL WB B)

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Application

Loss-in-Weight Feeder

Loss-in-Weight Feeders assemble a feeding device, a weighing system, and a control system together to produce a gravimetric feeder. This feeder accurately doses or weigh bulk powders and ingredients into specific flow rates or batches. Material flowing from the weighing device is weighed and adjusted continuously so that the weight loss per unit time matches the required values. Filcoflex polyurethane weighing bellows serve an important function in loss-in-weight feeders. Once incorporated into the system, it prevents vibration or movement from influencing the accuracy of the weighing equipment. This ability reduces stress in the system and increases the machine’s service life.

ATEX and Explosive atmospheres

Polyurethane materials are tested in compliance with ATEX regulations. ATEX, or Atmosphères Explosives, is a European Union directive that places requirements for equipment intended for use in environments with explosive hazards Explosion resistance is the ability of PU flexible sleeves to withstand increase in pressure in case of explosion. PU sleeves scored between 1 to 1.5 bar, with some outliers scoring as high as 2 bars. On the other hand, electrostatic properties testing measured the ability of the PU sleeves to charge and cause powder explosion. Results showed that PU material cannot charge enough to produce an explosion in powders with minimum ignition energy (MIE) higher than 1 mJ.

Compliance

Food Contact Compliancy

As a company from the Netherlands, all Filcoflex products are manufactured with the highest standards using ingredients that conform to REACH Regulations. 
(EC)1935/2004 
(EC)2023/2006 
FDA 21CFR 177.2 
The German BfR XV 600
EU Directive 2014/34
EU Directive 2002/72/CE

Banned Substances

Our silicone bellows are created free of banned substances to guarantee no contamination in your system. 
lead (Pb), cadmium (Cd), hexavalent chromium (Cr6+), mercury (Hg) 
Phthalates, Bisphenol A, polycyclic aromatic hydrocarbons (PAH), Short chain chlorinated parafins (SCCP)
Brominated flame retardants, including PBBEs, PBDEs, and octabromobiphenyl ether

Directives

We comply with European Union legislations to achieve the best results in our materials and production. 
EC Directive 2011/65/EC (RoHS)
EC Directive 2002/96/EC
EC Directive 2000/53/EC (ELV)
EC Directive 2003/11/EC
EC Directive 2006/122/EC

Production Method

Compression Molding 

Filcoflex silicone weighing bellows are created through a manufacturing technique called compression molding. A predetermined amount of silicone material is placed on a mold and vertically compressed by a hydraulic press. This method makes sure that the silicone fills the mold evenly, producing bellows that fit perfectly into your system.

The translucent silicone material is made from compression-molded silicone rubber (an elastomer of silicon, carbon, hydrogen, and oxygen). More carbon is then incorporated into the base silicone to achieve the electrostatic dissipative properties of the antistatic black version.

Our products undergo strict quality control for the best possible flexible connector.

We have a traceability program that archives production run samples for up to 7 years after the production date so they can be retested and re-evaluated upon request.

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Files

Brochure
Technical Data Sheet

FAQs

This is possible but only in systems with minimal deviation. Please consult us if you are unsure.

Yes, we can customize silicone weighing bellows with your own specifications at a minimum number of pieces. Our standard diameters for our 3 variations (Translucent White, Asymmetrical Conical White, Black) are also able to accommodate a certain stretch threshold.

There will be a longer lead time because we have to create new molds. We estimate 14 to 20 weeks for designing and producing, but this can extend to 6-8 weeks more if modifications are necessary after the first test samples.

Silicone bellows are used as a decoupling compensator to minimize force transfer from moving equipment to sensitive weighing equipment.

For best performance and employee safety, we recommend using couplings with our bellows. Basic couplings include hose clamps KLB09 and KLB20. For a more secure fit, you can opt for a Jacob FDM or Tri-Clamp silicone bellows version.

Need more help?

We understand that deciding which product to use can be daunting. Reach out to us and we will figure out the best solution for you!
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Tips and Resources

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