Durostone UPM S1 Polyester Glass

Durostone UPM S1 Polyester Glass


UPM S1 is a specially formulated polyester glass composite offering a superior balance of mechanical and electrical properties, that surpasses GPO-3 and moulded polyester glass products.

Designed for use in electrical equipment such as Switchboards as a structural insulating components, including busbar supports and cleats.

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An Electrical Insulation made just for Switchboards

Durostone UPM S1 is a specially forumlated polyester glass composite offering a superior balance of mechanical and electrical properties that surpasses GPO-3 and moulded polyester glass products.  This special material is a high pressure thermoset laminate consisting of a special polyester resin matrix reinforced with an e-glass roving mat manufactured to EN60893 / IEC893. 




V0/3mm Flammability


Glow-Wire Test Approved


High Tracking


Compliant with AS/NZS 61439 low-voltage switchgear and controlgear assemblies standard

AS/NZS 61439 is the latest standards for low-voltage (LV) switchgear and controlgear assemblies. There is a 5 year transitional period between AS/NZS 3439 and AS/NZS 61439, which started after the standard was introduced in May 2016. During this time, compliant boards can be built to either standard. The AS/NZS 61439 series can be purchased online at www.saiglobal.com 

Here are some key points regarding the release of AS/NZS 61439:


3 methods for verification

AS/NZS 614393.1 specifies three methods for verification - verification by testing, design rules, or assessment. These replace TTA and PTTA from AS/NZS 3439. 

Glow Wire Test

Durostone UPM S1 has passed the Glow Wire Test EN 60695-2-10, a critical aspect of AS/NZS 61439. Download the Test Report here.

Device substitution rules

Comparison with reference design according to AS/NZS 61439.1 introduces device substitution rules. The rules compare thermal properties and performance with a similar tested device withing a functional unit.




Download our data sheet, which contains the designs, standards and technical specifications on the most commonly requested products in this range. Should you require something outside of these parameters, please contact our customer service team below.


Need Advice?

Insulect have a team of Switchboard material specialists who can support you with application guidance, including advice regarding the AS/NZS 61439 standard.

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We supply to Australia, New Zealand, Papua New Guinea and Pacific Island nations.

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