- Email: [email protected]
Stemco unveils new long-life wheel-end system
NEWS
Meter provides rapid water vapor testing of electronics enclosures
Food-grade coating smoothes O-ring insertion
Although many seals can provide a good barrier to water, they will still allow permeation of water vapor – a major problem for many enclosures for electronic equipment. UK-based Versaperm Ltd has now introduced a quick and simple way to test materials, seals and finished enclosures. Water vapor can be extremely invasive, and the problems it causes have been estimated to cost hundreds of millions of pounds in the UK each year. The Versaperm Water Vapour Transmission (WVTR) meter has been designed to permit rapid testing of seals for enclosures etc. It can cope with several samples at a time, and can sometimes give a reading in as little as 30 min compared to several days for gravimetric measurement. The meter gives a series of digital readouts that can be recorded or simply read off a screen. It does not require re-calibration, and can give results that are accurate to better than one part per
Klüber Lubrication has introduced a water-miscible thermosetting coating that is intended to provide a dry, low-friction surface with good elasticity (up to 150%) on elastomers or metals. The lubricant – called Klubertop TP 38-901 – is formulated from FDA-approved raw materials, and can be used in applications that require a bonded coating and contact between foodstuffs and component cannot be excluded. A slowspeed friction coefficient of less than 0.03 is achievable on metal substrates and 0.2–0.35 for elastomers, depending on rubber hardness.
million. Sensitivities are in the range of 0.05–3200 g/m2/day. As well as manufacturing the instruments, Versaperm also offers a water vapor permeability laboratory service for companies that need to test samples on an irregular basis. Contact: Versaperm Ltd, B940-H41 Popjak Road, Sittingbourne Research Centre, Sittingbourne, Kent ME9 8PS, UK. Tel: +44 1795 430490, Fax: +44 1795 438274, Web: www.versaperm.co.uk
Editor’s comment: This equipment looks very interesting, as this is a widespread problem. However, users should beware of excessively short test periods, as permeation can take some time if there is a contorted sealing path. A feature in Sealing Technology in September 2003 described some of the necessary design features to minimize vapor ingress and methods to estimate the permeation.
Stemco unveils new long-life wheel-end system Texas-based Stemco has introduced the Platinum Performance System Plus (PPS+) as a high-performance wheel-end system, with a limited five-year parts and labor warranty coverage for new vehicles. The PPS+ includes the Discover or Guardian HP Seal, which combines high-temperature elastomers with PTFE to assist with achieving long-life sealing performance. The seals are part of a package that
includes an integrated hub cap with bidirectional venting, a Pro-Torq Axle Nut to permit consistent bearing adjustment, and heavy duty bearings.
Contact: Stemco LLC, 300 Industrial Boulevard, Longview, TX 75602-4720, USA. Tel: +1 903 758 9981, Fax: +1 903 232 3509, Web: www.stemco.com
Editorial office: Elsevier Advanced Technology, PO Box 150, Kidlington, Oxford OX5 1AS, UK. Tel: +44 (0)1865 843239, Fax: +44 (0)1865 843971 Editor: Bob Flitney, Tel: +44 (0)1799 501659, Email: [email protected] In-House Editor: Steve Barrett, Email: [email protected] Production Coordinator: Jonathan Bowden Editorial advisory board: William V Adams (USA) • Yves Birembaut (F) • Cyril X Latty (F) • Amrat Parmar (UK) • John Plumridge (UK) • Richard F Salant (USA) • Wolfgang Schöpplein (D) • Neil M Wallace (UK) Permissions may be sought directly from Elsevier Rights & Permissions Department, PO Box 800, Oxford OX5 1DX, UK; Tel: +44 (0)1865 843830, Fax: +44 (0)1865 853333, Email: [email protected]. You may also contact Rights & Permissions directly through Elsevier’s home page (http://www.elsevier.com), selecting first ‘Customer Support’, then ‘General Information’, then ‘Permissions Query Form’. In the USA, users may clear permissions and make payments through the Copyright Clearance Center, Inc, 222 Rosewood Drive, Danvers, MA 01923, USA; Tel: +1 978 7508400, Fax: +1 978 7504744, and in the UK through the Copyright Licensing Agency Rapid Clearance Service (CLARCS), 90 Tottenham Court Road, London W1P 0LP, UK; Tel: +44 (0)207 436 5931; Fax: +44 (0)207 631 5500. Other countries may have a local reprographic rights agency for payments.
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As the coating is completely dry and virtually colorless, neither the handling of the component nor its aesthetics are affected. Assembly forces for insertion of O-rings and other elastomer sealing rings can be reduced by 40%. Contacts: Klüber Lubrication München KG, Geisenhausenerstrasse 7, D-81379 München, Germany. Tel: +49 89 78760, Fax: +49 89 7876 333, www.klueber.com In the UK: Kluber Lubrication GB, Hough Mills, Northowram, Halifax HX3 7BN, UK. Tel: +44 1422 205115, Fax: +44 1422 206073.
Sealing cord for threaded pipes now available in two pack sizes Loctite 55 sealing cord is now available in two pack sizes, in lengths of 150 m and 50 m. The sealing cord, which looks rather like dental floss, is intended as a replacement for other methods of sealing threaded pipes such as PTFE tape, pastes and solvent drying compounds. The thin fibers are wound around the male threads of the joint, and then cut using the sharp in-built edge. The joint is sealed immediately on assembly, and is claimed to last almost indefinitely. The cord will even allow backing off if the assembly fittings do not align the first time. The cord can be used on cast iron, steel, brass, copper, chrome,
nickel-plated and galvanized surfaces, stainless steel and plastic. A particular advantage claimed for the cord is that it will not shred or tear and cause sealing particle debris in the pipework. The cord is approved for both the gas industry and for use with potable water up to 85°C. Contacts: USA: Henkel Loctite Corporation, 1001 Trout Brook Crossing, Rocky Hill, CT 06067-3910, USA. Tel: +1 860 571 5100, Fax: +1 860 571 5465, www.loctite.com Europe: Henkel Loctite Adhesives Ltd, Watchmead, Welwyn Garden City, Herts. AL7 1JB, UK. Tel: +44 1707 358800, Fax: +44 1707 358906.
Derivative Works Subscribers may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institutions. Permission of the publisher is required for resale or distribution outside the institution. Permission of the publisher is required for all other derivative works, including compilations and translations. Electronic Storage or Usage Permission of the publisher is required to store or use electronically any material contained in this journal, including any article or part of an article. Contact the publisher at the address indicated. Except as outlined above, no part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without prior written permission of the publisher. Address permissions requests to: Elsevier Rights & Permissions Department, at the mail, fax and email addresses noted above. Notice No responsibility is assumed by the publisher for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. Because of rapid advances in the medical sciences, in particular, independent verification of diagnoses and drug dosages should be made. Although all advertising material is expected to conform to ethical (medical) standards, inclusion in this publication does not constitute a guarantee or endorsement of the quality or value of such product or of the claims made of it by its manufacturer. 02129 Printed by Mayfield Press (Oxford) Ltd
Sealing Technology June 2004
Meter provides rapid water vapor testing of electronics enclosures
Food-grade coating smoothes O-ring insertion
Although many seals can provide a good barrier to water, they will still allow permeation of water vapor – a major problem for many enclosures for electronic equipment. UK-based Versaperm Ltd has now introduced a quick and simple way to test materials, seals and finished enclosures. Water vapor can be extremely invasive, and the problems it causes have been estimated to cost hundreds of millions of pounds in the UK each year. The Versaperm Water Vapour Transmission (WVTR) meter has been designed to permit rapid testing of seals for enclosures etc. It can cope with several samples at a time, and can sometimes give a reading in as little as 30 min compared to several days for gravimetric measurement. The meter gives a series of digital readouts that can be recorded or simply read off a screen. It does not require re-calibration, and can give results that are accurate to better than one part per
Klüber Lubrication has introduced a water-miscible thermosetting coating that is intended to provide a dry, low-friction surface with good elasticity (up to 150%) on elastomers or metals. The lubricant – called Klubertop TP 38-901 – is formulated from FDA-approved raw materials, and can be used in applications that require a bonded coating and contact between foodstuffs and component cannot be excluded. A slowspeed friction coefficient of less than 0.03 is achievable on metal substrates and 0.2–0.35 for elastomers, depending on rubber hardness.
million. Sensitivities are in the range of 0.05–3200 g/m2/day. As well as manufacturing the instruments, Versaperm also offers a water vapor permeability laboratory service for companies that need to test samples on an irregular basis. Contact: Versaperm Ltd, B940-H41 Popjak Road, Sittingbourne Research Centre, Sittingbourne, Kent ME9 8PS, UK. Tel: +44 1795 430490, Fax: +44 1795 438274, Web: www.versaperm.co.uk
Editor’s comment: This equipment looks very interesting, as this is a widespread problem. However, users should beware of excessively short test periods, as permeation can take some time if there is a contorted sealing path. A feature in Sealing Technology in September 2003 described some of the necessary design features to minimize vapor ingress and methods to estimate the permeation.
Stemco unveils new long-life wheel-end system Texas-based Stemco has introduced the Platinum Performance System Plus (PPS+) as a high-performance wheel-end system, with a limited five-year parts and labor warranty coverage for new vehicles. The PPS+ includes the Discover or Guardian HP Seal, which combines high-temperature elastomers with PTFE to assist with achieving long-life sealing performance. The seals are part of a package that
includes an integrated hub cap with bidirectional venting, a Pro-Torq Axle Nut to permit consistent bearing adjustment, and heavy duty bearings.
Contact: Stemco LLC, 300 Industrial Boulevard, Longview, TX 75602-4720, USA. Tel: +1 903 758 9981, Fax: +1 903 232 3509, Web: www.stemco.com
Editorial office: Elsevier Advanced Technology, PO Box 150, Kidlington, Oxford OX5 1AS, UK. Tel: +44 (0)1865 843239, Fax: +44 (0)1865 843971 Editor: Bob Flitney, Tel: +44 (0)1799 501659, Email: [email protected] In-House Editor: Steve Barrett, Email: [email protected] Production Coordinator: Jonathan Bowden Editorial advisory board: William V Adams (USA) • Yves Birembaut (F) • Cyril X Latty (F) • Amrat Parmar (UK) • John Plumridge (UK) • Richard F Salant (USA) • Wolfgang Schöpplein (D) • Neil M Wallace (UK) Permissions may be sought directly from Elsevier Rights & Permissions Department, PO Box 800, Oxford OX5 1DX, UK; Tel: +44 (0)1865 843830, Fax: +44 (0)1865 853333, Email: [email protected]. You may also contact Rights & Permissions directly through Elsevier’s home page (http://www.elsevier.com), selecting first ‘Customer Support’, then ‘General Information’, then ‘Permissions Query Form’. In the USA, users may clear permissions and make payments through the Copyright Clearance Center, Inc, 222 Rosewood Drive, Danvers, MA 01923, USA; Tel: +1 978 7508400, Fax: +1 978 7504744, and in the UK through the Copyright Licensing Agency Rapid Clearance Service (CLARCS), 90 Tottenham Court Road, London W1P 0LP, UK; Tel: +44 (0)207 436 5931; Fax: +44 (0)207 631 5500. Other countries may have a local reprographic rights agency for payments.
2
As the coating is completely dry and virtually colorless, neither the handling of the component nor its aesthetics are affected. Assembly forces for insertion of O-rings and other elastomer sealing rings can be reduced by 40%. Contacts: Klüber Lubrication München KG, Geisenhausenerstrasse 7, D-81379 München, Germany. Tel: +49 89 78760, Fax: +49 89 7876 333, www.klueber.com In the UK: Kluber Lubrication GB, Hough Mills, Northowram, Halifax HX3 7BN, UK. Tel: +44 1422 205115, Fax: +44 1422 206073.
Sealing cord for threaded pipes now available in two pack sizes Loctite 55 sealing cord is now available in two pack sizes, in lengths of 150 m and 50 m. The sealing cord, which looks rather like dental floss, is intended as a replacement for other methods of sealing threaded pipes such as PTFE tape, pastes and solvent drying compounds. The thin fibers are wound around the male threads of the joint, and then cut using the sharp in-built edge. The joint is sealed immediately on assembly, and is claimed to last almost indefinitely. The cord will even allow backing off if the assembly fittings do not align the first time. The cord can be used on cast iron, steel, brass, copper, chrome,
nickel-plated and galvanized surfaces, stainless steel and plastic. A particular advantage claimed for the cord is that it will not shred or tear and cause sealing particle debris in the pipework. The cord is approved for both the gas industry and for use with potable water up to 85°C. Contacts: USA: Henkel Loctite Corporation, 1001 Trout Brook Crossing, Rocky Hill, CT 06067-3910, USA. Tel: +1 860 571 5100, Fax: +1 860 571 5465, www.loctite.com Europe: Henkel Loctite Adhesives Ltd, Watchmead, Welwyn Garden City, Herts. AL7 1JB, UK. Tel: +44 1707 358800, Fax: +44 1707 358906.
Derivative Works Subscribers may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institutions. Permission of the publisher is required for resale or distribution outside the institution. Permission of the publisher is required for all other derivative works, including compilations and translations. Electronic Storage or Usage Permission of the publisher is required to store or use electronically any material contained in this journal, including any article or part of an article. Contact the publisher at the address indicated. Except as outlined above, no part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without prior written permission of the publisher. Address permissions requests to: Elsevier Rights & Permissions Department, at the mail, fax and email addresses noted above. Notice No responsibility is assumed by the publisher for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. Because of rapid advances in the medical sciences, in particular, independent verification of diagnoses and drug dosages should be made. Although all advertising material is expected to conform to ethical (medical) standards, inclusion in this publication does not constitute a guarantee or endorsement of the quality or value of such product or of the claims made of it by its manufacturer. 02129 Printed by Mayfield Press (Oxford) Ltd
Sealing Technology June 2004