There are several types of sealants used for secondary sealing of insulating glass units (IGUs): two-component polyurethane- and polysulfide-based sealants, one-component hot-melt sealants, and silicone sealants. A separate category includes two-component structural silicone sealants used for structural glazing applications.
The primary competition in today’s market is between polyurethane (PU) and polysulfide (PS) sealants. Each has its own advantages and limitations. One of the key differences is cost: polyurethane sealants are generally more affordable but require greater attention to manufacturing discipline and process control. Polysulfide sealants, on the other hand, are less demanding in terms of precise component mixing and can tolerate certain equipment deviations, partially offsetting their higher purchase price.
Recently, the market has evolved with the introduction of a new generation of polysulfide sealants whose price is comparable to—or in some cases even lower than—that of polyurethane alternatives. Manufacturers claim that these new formulations offer performance comparable to conventional polysulfide sealants while arguing that the pricing of traditional European products has become unnecessarily high.
In practical production, it is difficult to distinguish the new-generation polysulfide sealant from its conventional counterpart. However, the new PS sealant has a noticeably stronger characteristic odor and a lower Shore A hardness value. The latter can often be recognized even without specialized measuring equipment. These characteristics deserve a more detailed technical analysis and will be discussed in a future article.
It is important to note that one of the most critical indicators of sealant quality is its resistance to water vapor and gas permeability. These performance characteristics are regulated by DIN EN 1279-2, DIN EN 1279-3, and DIN EN 1279-4and must be verified through certification issued by recognized independent organizations such as TÜV, ift Rosenheim, CECAL, IKATES, and the Instytut Szkła i Ceramiki i Materiałów Budowlanych.
Some European certification bodies have reported that certain manufacturers submit premium-quality materials for testing during the certification process but subsequently alter the formulation and quality of the product after certification has been obtained. Such cases raise an important question: does the end user actually receive a product that meets the declared quality standards?
When comparing different sealants, it is essential to evaluate products within the same category—namely, high-quality polyurethane and polysulfide sealants whose performance has been verified through recognized certification.
Gran Polychem emphasizes that its polyurethane sealants are manufactured exclusively using raw materials supplied by leading global producers, including Omya, DOW Chemical, Covestro, DEZA, and Evonik.
Ease of application is another important consideration. When working with any polyurethane sealant, including JOD-32, manufacturers must maintain strict production discipline by ensuring that equipment is properly maintained, the mixing unit remains clean, and, in particular, that Component B, which is highly sensitive to moisture, is carefully monitored.
Despite these production requirements, JOD-32 offers several significant advantages:
No strong or unpleasant odor;
Fast curing;
A proprietary, thoroughly proven formulation;
Low operating pressure;
High material flow rate, enabling highly efficient insulating glass unit production.
The final advantage is particularly valuable for manufacturers operating under piece-rate production systems, where productivity directly affects efficiency.
The high quality of JOD-32 is confirmed by the company’s ISO 9001:2015 certification and by successful testing conducted by the Instytut Szkła i Ceramiki i Materiałów Budowlanych in accordance with DIN EN 1279-6. Product certification by ift Rosenheim is currently undergoing renewal.
It is also worth noting that more than half of insulating glass manufacturers use Reinhardt Technik Ecostar 250, HDT Classic, Pro 6, and T-S-I Ecomix extruders, whose performance depends significantly on the viscosity and density of the sealant being processed.
At the same time, one of JOD-32’s strongest competitive advantages remains its price, which is significantly lower than that of conventional polysulfide sealants. The manufacturer continues to invest in further improving the product’s performance and enhancing the quality of JOD-32.
Gran Polychem maintains close communication with its customers and responds promptly to their feedback, requests, and technical requirements.
Whenever necessary, the characteristics of the product can be customized to meet the specific needs of a particular manufacturing process. Parameters such as curing speed, viscosity, sealant density, and other technical properties can be adjusted to match the customer’s production requirements.
All sealants are manufactured in Ukraine. Thanks to the use of compact mixing systems, the company is able to produce test batches quickly and efficiently according to each customer’s individual specifications.
The quality of JOD-32 is confirmed by the company’s ISO 9001:2015 certification and by successful testing conducted by the Instytut Szkła i Ceramiki i Materiałów Budowlanych in accordance with DIN EN 1279-6. Product certification by ift Rosenheim is currently undergoing renewal.
Gran Polychem also offers a container return program for its partners. This initiative enables customers to conveniently recycle used containers while receiving discounts on future sealant purchases.
The company is currently focused on expanding its market presence and increasing sales. This growth is supported by an excellent price-to-quality ratio, professional technical support, the availability of trial equipment, and flexible installment purchase options for production equipment.
We are always open to new partnerships and are committed to providing every customer with the highest level of service and technical support.