For neoprene bridge bearings, ptfe sliding bearings, pot bearings
Saturday, July 17, 2004
For neoprene bridge bearings, ptfe bearing, ptfe sliding bearings, sliding structural bearing, neoprene ptfe bearing, ptfe sheets, ptfe coating, ptfe rod, pot bearing, pipe supports,sliding structural bearings,
Added new page with more details on ptfe bearings
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http://www.pretread.com/neoslidepads.html
Friday, July 16, 2004
Building structural design has taken a considerable change over the last decade. The sizes of spans have grown bigger, difference of internal and external temperature has become greater and global warming has changed climatic changes. These factors have exerted great demand on elastomeric bearing design and requirements. New polymer types and combinations with Stainless Steel have paved way for new designs. Thus from ARP we offer a combination of elastomeric bearing with ptfe known as ARP-NEOSLIDEPAD for PTFE sliding bearing requirements.
ARP-NEOSLIDEPAD – (PTFE Sliding bearing system with Stainless Steel Top and Neoprene Protective Seal) are specially designed, manufactured and assembled with a combination of polyamide or steel reinforced neoprene bearing pad with PTFE top and a SS 316 L plate sliding over top of it and whole unit protected with a soft neoprene seal.
Using a combination of Steel reinforced Neoprene, PTFE, Stainless Steel and Soft Neoprene protective Seal, our ARP-NEOSLIDEPAD permits displacement of ± 25 mm. Maximum permissible pressure for steel reinforced pads will be 15N/mm². The total size of ARR-NEOSLIDEPAD will be minimum 60 mm>Neoprene /PTFE bearing.
The properties of ARP-NEOSLIDEPAD are exceptionally suited for reduction of bearing height compared to Laminated Elastomeric bearings, at the same time retains horizontal displacement and rotation.
Design advantages of ARP-NEOSLIDEPAD:
Steel Reinforced Neoprene Elastomeric Bearing is bonded on topside with Ptfe (Teflon)
Top sliding plate over Ptfe will be Stainless Steel 316 L with mirror finish on one side
Unfilled Ptfe sheet offered has low friction of coefficient 0.05 with mirror finished steel, and being self lubricated, long term smooth sliding even at high pressure of 15N/mm²
Neoprene bearing is covered in all sided by a soft Neoprene seal.
Size of this Protective Neoprene seal is greater than the required movement; hence mirror finished bottom side of SS sheet will be protected from any scratches due to dirt accumulation in long service.
Stainless Steel Top plate is placed in location over Neoprene Bearing using High Strength Adhesive tape.
Complete system will be packed in thick polyethylene and delivered as a unit.
Cut off area on both top and bottom sides will be marked on polyethylene and can be removed at the time of casting.
Less expensive compared to heavy sliding bearing.
Easy to install with in-situe concreting.
Manufactured in UAE, less delivery time.
Some salient features and benefits of ARP-NEOSLIDEPAD;
Do not have a shape limit factor can be custom manufactured to your requirements.
Exhibit relatively high damping (C/Cc -.14)
Creep effects are reduced to a limit of 5% of original thickness
Operating temperature limits are -65°F (-55°C) to 200°F (95°C)
Unusually high compressive strength –5Kg/cm² for polyamide reinforced pads and 15Kg/cm² for steel reinforced pads.
Impervious to most oil and solvent traces
Resist effects of steam, water, mildew and brine
Can be supplied as a system in nominal thickness of 10 mm up to 50 mm.
Combination of both vertical load and horizontal movements with rotation
Faster delivery and accepted quality: Manufactured in UAE.
Some practical aspects and considerations when using AR -NEOSLIDEPAD:
Provides vertical stability and allow controlled motion
Should be used with flat rigid support for best performance
Recommend applying of a high strength epoxy mortar on bottom of Pad and an Epoxy resin with aggregate on top of Stainless Steel plate to work as a key.
Connections to isolating system should be made flexible
ARP-NEOSLIDEPAD System (PTFE Sliding bearing System with SS Top and Neoprene Protective Seal) - Properties and Technical Specifications
Strength and Compression
ARP-NEOSLIDEPAD will withstand loads up to 22.5 Kg/cm² before breakdown, depending upon size and thickness of the pad. In general compressive stresses should not exceed 15.0kg/ cm² for steel reinforced Pads for long life, freedom from set and high FOS (factor of safety). For requirement of Pads for higher stress levels, contact our ARP® Engineering Department.
Compression
ARP-NEOSLIDEPAD is compressible due to its special construction and does not rely on flow, as a normal rubber pad does, to give necessary deflection. It substantially retains original length and width under compression and impact.
Set and Creep
One of the great advantages of ARP-NEOSLIDEPAD is the fact that increased deflection due to creep over long periods of time is limited to about 10% of the original thickness. When stresses are removed, permanent set is limited to about 2.5% of the original thickness. This explains the continued high isolating efficiency of ARP-NEOSLIDEPAD through long periods of continuous hard service.
Compressive Modulus
ARP-NEOSLIDEPAD load-deflection curve is nonlinear, therefore its modulus varies with load and is determined by: M=1.5 X (stress/strain)
As with compressive modulus, ARP-NEOSLIDEPAD static spring rate varies with loading. The formula is: K = M X (Af/Tf) or K = 1.5 X (Force/Deflection)
Hardness and Stability
The Shore A Durometer hardness of ARP-NEOSLIDEPAD is 60 ± 5. This combined with a limited compressibility affords a greater degree of stability than is found in other types of elastomeric bearings.
Service Life
The unusual strength of ARP-NEOSLIDEPAD system and its ability to withstand conditions of service commonly encountered with both indoor and outdoor applications insures long life and constant efficient performance. (Refer to our warranty)
Fabrication
ARP-NEOSLIDEPAD system is furnished in sizes of your requirement. Pads and strips can be specially fabricated or molded in accordance with customer’s specifications and drawings. These Pads are manufactured in 500 Ton Hydraulic Press under heat and pressure.
Resistance To Water, Oil And Heat
ARP-NEOSLIDEPAD system is impervious to most oils and resistant to effects of steam, water, mildew and brine. Continuous temperature exposure limits for long life are 200°F (95°C) maximum and -65°F (-55°C) minimum.
ARP-NEOSLIDEPAD system sizes and thickness.
Reinforced pads with steel reinforcement:
Reinforced pads with steel reinforcement are available in thickness from 10 mm to 50 mm in any size.
Please contact awphdxb@emirates.net.ae for actual thickness and tolerance values.
Some typical applications ARP-NEOSLIDEPAD system include:
Buildings
Floor isolations
Heavy Loading Areas
Military
Mining
Pipelines Railroad and Transit
