Ask the Experts

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Ask the Experts

Expected gas strut life

In ideal fitting circumstances, at room temperature and a maximum of three cycles per minute Camloc Gas Springs have a permitted maximum force loss of 10% after 50,000 cycles. In some instances, our customers have successfully tested Camloc Gas Springs to over 200,000 cycles.

However, it should be noted that in real-life applications the life expectancy of a gas spring is extremely difficult to predict and can vary considerably due to a number of factors.

These factors include the type of environment the spring is to be used in, for how long and in what manner the spring has been stored prior to use, whether the spring is subject to temperature change or temperature cycling, whether the application is subject to vibration, the usage frequency, the type of end fittings used and whether the spring is subject to lateral movement to name a few examples.

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Gas strut corrosion performance

Similar to lifecycle performance corrosion performance is affected by numerous factors.

Real-world performance is very difficult to predict, however in laboratory conditions Camloc Motion Control Ltd products are tested in accordance with ASTM B117 standards and achieve the following results:

  • Zinc plate & Trivalent Passivated parts – 72hrs to white corrosion
  • Zinc Alloy parts – 72hrs to white corrosion
  • Carbon steel rod – 144hrs to red corrosion
  • Carbon steel tube – 250+ hrs to red corrosion

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Gas strut disposal advice

Gas struts are highly pressurised products and can be potentially dangerous. To eliminate potential dangers gas struts and dampers should be disposed of correctly in accordance with these instructions.

Before disposal gas struts they must first be depressurised. The oil inside the strut must be drained and disposed of separately in accordance with local regulations. As a gas strut is predominantly manufactured from metal components they can be recycled.

To safely dispose of a standard compression gas strut, we recommend the following procedure;

  • Using a vice or other work holding equipment ensure the gas strut is held securely without causing damage to the tube.
  • Using a 2 to 3mm drill slowly bore a hole approximately 15- 20mm from the end of the plug of the gas spring tube to release the pressure.
  • Due to the high internal pressure, it is possible for oil and / or metal fragments to spray out from the drilling location. Safety precautions must be observed during this process, this includes covering the drill area, wearing safety glasses, ear plugs and protective clothing.

⚠ Do not under any circumstances use a lathe or cut the tube before first depressurizing the gas strut. ⚠

  • Once the hole has been drilled, use the piston rod to cycle the depressurized gas spring a few times with the hole over a container to capture any waste oil. This oil should be disposed of responsibly and in accordance with local waste oil regulations.
  • If necessary, the tube can now be cut through.
  • A gas strut is primarily composed of metal components that can be recycled and disposed of according to local authority guidelines.

The gas used in the manufacture of Camloc gas springs is Nitrogen which is an inert gas and is not toxic or explosive. However, it does not sustain life and there may be small oil particles suspended in the gas during the degassing process. It is therefore recommended that the gas springs are degassed in a well-ventilated room.

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Gas strut shelf life and storage recommendations

Camloc Gas springs should be stored in a clean, dry environment at room temperature between 10 and 25°C. Springs must be stored with the rod facing downwards.

Some force loss should be expected due to sealing material aging and gas permeability through the seal, typically this would be around 1 to 2% per year and would be typical for all makes of gas spring.

Failure to store the springs in the correct orientation can lead to the seal drying-out which will accelerate force loss.

Factors such as temperature changes and environmental conditions can affect seal aging and speed up the process of force loss.

Most applications will tolerate a maximum force loss of 10%, although this is application dependant.

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Gas Struts – CE Marking & Pressure Equipment Directive (PED) 2014/68/EU

Gas springs and hydraulic dampers manufactured by Camloc Motion Control Ltd can be charged to high internal pressures. They must not be heated or opened.

They are manufactured and distributed in accordance with the Pressure Equipment Directive 2014/68/EU(1). Camloc gas springs and hydraulic dampers filled with gas can be used safely as defined by this directive.

Camloc gas springs and hydraulic dampers stay below the limit values in article 4 (1) a) i) of the directive for pressure and volume. Thus, they meet article 4 (3) of the Pressure Equipment Directive 2014/68/EU and are designed and manufactured in accordance with the sound engineering practice of the member state in which they are produced.

The fluids in their construction are fluids of group 2 according to the classification in article 13 of the directive.

Camloc gas springs and hydraulic dampers are characterised according to article 4 (3) by means of which the manufacturer can be determined and warnings which refer to the possible high internal pressure and resulting dangers. As such Camloc gas springs and hydraulic dampers shall not bear the CE marking referred to in article 18 of the directive.

Camloc gas springs and hydraulic dampers do not fall under the machinery guidelines 98/37/EG or 2006/42/EG.

It is the sole responsibility of the customer or user to verify whether Camloc gas springs and hydraulic dampers used in the end-product meet national or international laws and guidelines.

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RoHS, WEEE, REACH & ELV directives

Camloc Motion Control Limited (CMCL) designs and manufactures gas springs, dampers and associated products.

The information provided below relates to the following regulations / directives and is intended to provide general guidance to our customers to help them select compliant products.

  • RoHS Directive (EU) 2015/863 (including all amendments)
  • REACH Regulation (EC) No 1907/2006 (including all amendments)
  • WEEE Directive 2012/19/EU

RoHS 3 and WEEE Declaration

The RoHS (Restriction of Hazardous Substances) directive and the WEEE (Waste Electrical & Electronic Equipment) directive affect electrical and electronic products sold into the EU market restricting the use of specific substances. To the best of our knowledge all CMCL products currently in production are compliant with the Directives listed above and do not contain any of the Substances of Very High Concern (SVHCs). According to our upstream supplier information, our products either do not contain, or do not exceed the legislative thresholds (or exemptions listed thereof) of any of the substances published by the European Chemicals Agency (ECHA). Additionally, gas springs manufactured by CMCL are not considered to be electric or electronic equipment (EEE) products as defined in the directive as they are not ‘dependant on electrical current or electromagnetic fields for at least one intended function’.

REACH Declaration

Under the definition of the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulations EC1907/2006, products made by CMCL are considered to be articles. An article means an object which during manufacture is given a unique shape, surface or design which determines its function more than its chemical composition. Under the current regulations, articles do not require pre-registration or registration. As downstream users of substances and preparations, we have contacted our suppliers and confirmed that they are compliant with the REACH regulation.

Camloc Motion Control will continue to comply with REACH requirements and notify customers of any changes in article content.

ELV Directive

The End of Life Vehicle (ELV) directive restricts the use of specific hazardous substances (Lead, Cadmium, Mercury and Hexavalent Chromium). Only Lead, used as an alloying element, is present within Camloc gas springs and falls below the maximum allowable level of 0.1%.

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What materials are used to manufacture gas struts?

See what materials are used to manufacture each component.

Rod

Carbon steel rods are manufactured from low alloy steel bar in accordance with BS EN 10083-2, ground to give the required surface texture and nitride finish. Stainless steel rods are manufactured from 316L grade stainless steel and chrome plated.

Tubes

Carbon steel tubes are manufactured from low alloy welded precision steel tube in accordance with BS EN 10305-2. Stainless steel tubes are manufactured from 316L grade stainless steel.

Paint

Carbon steel surfaces are black epoxy powder coated as standard to give enhanced resistance to abrasion and corrosion.

Oil

Lubrication and damping is achieved with a commercial grade mineral oil.

Gas

The power behind the gas spring is provided by a charge of high purity Nitrogen.

End Connectors

  1. Low alloy steel end connectors are generally zinc plated with a clear passivate and comply with RoHS & WEEE directives.
  2. Plastic and connectors are moulded with glass filled nylon.
  3. Zinc eyes are produced from commercial grade die cast zinc.

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What national or international standards apply to gas struts?

There are no National or Internationally recognised standards for gas struts.

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