The difference between one component silicone sealant and two ...

One-component silicone sealant is commonly packaged in 300ml catridge and 590ml sausage foil; two-components silicone sealant is generally divided into two types, A & B. Gom A is white, and Com B is a curing agent, showing black. Generally, Com A is 190L per Drum, Com B is 19L per barrel.

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When using, it is necessary to mix the two Com A and B in proportion to achieve the curing effect; the one component silicone sealant without mixing.

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One-component silicone sealant can be used with a special sealant gun, which is more convenient to use and easy to carry, but because of its small capacity, the construction area is not large, but the advantage is that it is convenient and fast. The two-component silicone sealant is use dedicated glue machine to mix glue. Generally, it needs to be used in a professional workshop. It has certain difficulties in terms of proportion and machine operation requirements, so it needs professional workers to operate.

The curing principle of one-component silicone sealant is to react with water molecules in the air for curing.Under high temperature and high humidity, the curing is faster, low temperature, low humidity and large glue gap,the curing is slower. One-component silicone glue is cured for 21 days under standard conditions, and it actually takes 5-15 days for the glue to fully cure. The curing of the two-components silicone sealant is the reaction and cross-linking curing of the AB component. more ComB , the curing is more faster. higher temperature, the curing is faster . Usually, it can be completely cured in 1-3 hours, but it needs about 3 days to curing. It takes time to fully curing and achieve the desired strength.

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Wayne Yancey
Senior Member
Username: wyancey

Post Number: 70
Registered: 05-
Posted on Thursday, September 22, - 11:59 am:    Type defines whether products are premixed or require mixing at the jobsite as follows:

Type S products are those furnished in prepackaged cartridges or other forms in which no jobsite mixing is required. The single-component products are more expensive than their multicomponent counterparts because of the extra labor and packaging costs involved in supplying materials in small quantities rather than in bulk form.

Type M products are those furnished in two or more parts for mixing at the jobsite. Multicomponent products include those with two components consisting of a base and a catalyst or with three components consisting of not only a base and catalyst but also a separate color component. Multicomponent products cure faster than their single-component counterparts, which is often advantageous for joints subject to traffic or similar exposures where this characteristic is desired. Despite concerns over poorer quality control by mixing products at the jobsite, the multicomponent products are often superior in quality of performance in comparison to corresponding single-component formulations.

Grade defines the flow characteristics of the sealant as follows:

Grade P products have sufficient flow to fill joints in horizontal surfaces and remain level and smooth at temperatures as low as 40 deg F (5 deg C). This designation generally applies to products rated for traffic use.

Grade NS products are suitable for installation in joints in vertical surfaces without sagging at temperatures between 40 and 122 deg F (5 and 50 deg C). This designation can apply to sealants classified for both traffic and nontraffic uses. They can be installed in traffic joints in sloping horizontal surfaces where a self-leveling type would flow downhill.

Class identifies sealants according to their tested capabilities to remain adhered to given joint substrates without experiencing cohesive failure when subjected to repeated cycles of joint expansion and contraction over a minimum range measured as a percentage of joint width at the time of sealant application.

Classes 12-1/2, 25, 35, 50, and 100/50 are the five designations in ASTM C 920 for rating movement capability. Although sealants ought to perform in the field as well as they do during testing, it is more prudent to design joints that impose lesser extremes of movement than that demonstrated in the laboratory because of the unknowns present in the field relative to qualities of joint preparation, sealant application, construction tolerances producing varying joint widths, and the effect of installation temperatures on joint widths. With the recognition of new Classes 35, 50, and 100/50, the sealant industry has finally acknowledged sealants with this higher movement capability after years of resistance by manufacturers who did not offer products with these extra movement capabilities.

Use T classifies sealants designed for joints in surfaces subject to pedestrian and vehicular traffic

Use classifications related to exposure are designated as follows:

Use NT classifies sealants designed for nontraffic exposures.

Use classifications related to joint substrates are designated as follows:

Uses M, G, and A refer to sealants that remain adhered, within given parameters, to various standard specimens including, respectively, mortar (M), glass (G), and aluminum (A) when tested for cyclic movement and adhesion-in-peel. It is important to understand that the specimens related to these designations are not those specified for the Project but those that comply with restrictive material specifications in the ASTM test methods. Mortar is always portland cement mortar, glass is clear float glass, and aluminum is clear anodized aluminum of a specific alloy. These standard substrates are covered in ASTM C , Guide of Substrates Used in Testing Building Seals and Sealants.

Use O refers to substrate materials other than M, G, and A. Unless it is definitely known that the joint substrate materials for the Project are identical to the materials designated by M, G, and A, retain Use O.

The major change to ASTM C 920 was the recognition of sealants with higher movement capabilities by including Classes 35, 50, and 100/50 and adding Use I for sealants designed for use in joints that will be submerged continuously in liquids.