ADCO’s ‘HelioSeal’ PVS 800 J-Box potting sealant offers significant reduction of moisture risk

Facebook
Twitter
LinkedIn
Reddit
Email

ADCO Products has developed a new PV sealant and J-Box pottant that is claimed to offer a significant reduction in moisture permeability. The ‘HelioSeal’ PVS 800 is a newly developed, hot-melt pumpable, butyl material designed to seal a module’s back hole (a hole that is drilled through glass to let power wires and conducting tapes through to the J-Box) and to pot the J-Box all at the same time, avoiding corrosion and preventing moisture vapour from passing through to the wire connections.

Problem

This article requires Premium SubscriptionBasic (FREE) Subscription

Unlock unlimited access for 12 whole months of distinctive global analysis

Photovoltaics International is now included.

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Unlimited digital access to the PV Tech Power journal catalogue
  • Unlimited digital access to the Photovoltaics International journal catalogue
  • Access to more than 1,000 technical papers
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Corrosion and moisture vapour transmission can greatly affect module reliability – methods for prevention of these factors can improve this reliability and thus return on investment.

Solution

Using HelioSeal PVS 800 for both the back hole and potting applications allows PV module manufacturers to maximize protection against moisture. When combined with HelioBond 200 or HelioBond 205 structural adhesive products, it is claimed to provide a single source for all J-Box attachment and sealing requirements. HelioSeal PVS 800 is applied using industry-available hot-melt equipment. Standard hot-melt bulk unloaders are recommended, as they use optimum length heated hoses and a heated platen ram to achieve proper melt rate to allow for required flow rates. HelioSeal PVS 800 does not require hydraulic-assisted ram plates to achieve higher volumes nor does it require vacuum de-gassing. Typical system heat requirements of the hot melt bulk unloader are 275°F – 325°F (135°C – 163°C). Rod displacement or metered gears are both acceptable dispensing technologies. The dispense nozzle temperature range can be 275°F – 325°F (135°C – 163°C). Typical flow rates for this product of 400cc/minute can be reached under these conditions.

Applications

J-Box sealing.

Platform

HelioSeal PVS 800 is UL listed under QIHE2 having obtained all of the electrical property performance approvals needed for junction box potting. HelioBond PVA 205 is an easily applied, neutral curing, one-part silicone sealant that reacts with atmospheric moisture to form a durable and flexible seal. HelioBond PVA 205 has a high modulus and elasticity for the manufacture of dual seal insulating glass that can be exposed to direct UV as in flush glazed IG Units.

Availability

Currently available.

Read Next

July 11, 2025
The Australian Energy Market Operator (AEMO) has revealed that several utility-scale solar PV power plants experienced curtailment of above 25% in the National Electricity Market (NEM) in 2024.
July 10, 2025
German renewables company BayWa r.e. has secured a €3 billion (US$3.5 billion) loan for 'operational initiatives and pipeline expansion.'
July 10, 2025
US renewables developer Invenergy has launched commercial operations of 250MW Fairbanks Solar Energy Center in Sullivan County, Indiana. 
July 10, 2025
US solar residential installer Sunnova has entered into a stalking horse asset purchase agreement with Omnidian for some of its assets.
July 10, 2025
A report published by the US Department of Energy (DOE) this week claims that the previous government’s support for renewable energy could cause blackouts to “increase by 100 times” by 2030.
July 10, 2025
UbiQD has signed a supply agreement with First Solar to supply its fluorescent quantum dot technology for use in the latter’s PV panels.

Subscribe to Newsletter

Upcoming Events

Media Partners, Solar Media Events
September 2, 2025
Mexico City, Mexico
Solar Media Events
September 16, 2025
Athens, Greece
Solar Media Events
September 22, 2025
Bilbao, Spain
Solar Media Events
September 30, 2025
Seattle, USA
Solar Media Events
October 1, 2025
London, UK