ZJ-2000 Silicone Weatherproofing Sealant - Hangzhou Zhijiang Silicone Chemicals Co.,Ltd

ZJ-2000 Silicone Weatherproofing sealant is a one-part, neutral-cure, architectural grade sealant specifically designed for general glazing and weather sealing in curtain wall and building facade. It easily extrudes in a wide rang weather condition and quickly cures at room temperature by reaction with moisture in the air to form a excellent , durable, flexible silicone rubber seal.

d. Excellent weather ability, virtually unaffected by sunlight, rain, snow, ozone or temperature extremes.

f. Extension/compression movement capability of up to ±50% of the original joint width.

ZJ-2000 is especially designed for general glazing and weather sealing in curtain wall and building facades. It is suitable for glazing weatherproofing movement joint and sealing the joints of the non-structural curtain wall. It can form a waterproofing sealed layer to many kinds of glasses, coated aluminum, decorative metal board, tile, and granite without primmer.

ZJ-2000 silicone Weatherproofing sealant is not fit for structural usage. It should NOT be applied in the following conditions:

a. To building materials that bleed oils, plasticizers or solvents and green or partially sulfur zed gaskets or tapes, etc.

b. In totally confined spaces (Silicon sealant need the water in the air to cure)

d. To painted surfaces, may cause seal failure as the paint cracking or paint stripping

No	Item			The standard	Test result	Test method
Test at 50±5% RH and temperature 23±2℃
1	Appearance			Have no grain, no agglomerations,1	Pass the the standard
2	Droop degree mm	Uprightness		≤3	0	GB/T¹13477.6-2002
2	Droop degree mm	Level		No distortion	No distortion	GB/T¹13477.6-2002
3	Tack Free Time, h			≤3	0.8	GB/T¹13477.5-2002
4	Extrusion ability, ml/min			≥80	137
5	Tensile modulus Mpa		23℃	> 0.4 or > 0.6	0.5
5	Tensile modulus Mpa		-20℃	> 0.4 or > 0.6
6	Curing time at 50±5% RH and temperature 23±2℃,days			7-14	7-14
As Cured –After 21days at 50±5% RH and temperature 23±2℃:
7	Durometer Hardness,(Shore A), points				28	GB/T¹531-1999
8	Tensile strength at 25% elongation, Mpa				0.2	GB/T¹13477.8-2002
9	Tensile strength at 25% elongation, Mpa				0.35	GB/T¹13477.8-2002
10	Tensile at 100% Elongation				no break	GB/T¹13477.8-2002
11	Ultimate elongation % at break，%				350-400	GB/T¹13477.8-2002
12	Sealant Class				25LM	ISO 11600 or JC/T881-884-2001

ZJ-2000 Silicone Weatherproof sealant can keep good viscous degree and can easily extruded at -25℃ to 50℃; Can keep good flexibility at -50℃ to 150℃ after cured. It is unaffected by UV ray, rain, ice, snow, air pollution, ozone and high or low temperature. Even under the severe weather conditions, it can maintain excellent weatherproofing and waterproofing properties for some years, ZJ-2000 has an excellent compatibility with reflect glass, doubling glass, silicone hollow glass, acrylic acid, polythene and etc.

ZJ-2000 silicone weatherproof sealant is available 4 standard colors: white, black, grey, brown. We can also supply the other color according to the customer’s requirement.

It has a useable life of 12 months from the produced date when stored under dry and airy,27℃ or lower temperature conditions in the original unopened container.

Construction project technology service

It's needed to take the design, choose materials, operation into consideration for the structural joint sealing. The technical communication between suppliers and applicants are necessary for the present situation: varied sealant types, daily changing materials and the compatibilities between surface treatment and materials. Hangzhou Zhijiang Silicone Chemicals Co., Ltd. Gives construction project technical services as follows:

Adhesion Testing

ZHIJIANG Silicone will evaluate tests about the adhesion of our products to job site or representative job site materials in standard laboratory. Results of the adhesion testing, product recommendations and surface preparation will be forwarded in writing.

Compatibility Testing

Incompatibility of glazing materials can lead to sealant discoloration and/or loss of adhesion. To help protect against these problems and to ensure compatibility, ZHIJIANG will also test and provide information on the compatibility of accessory materials (gaskets, spacers, etc.) and other ZHIJIANG Silicone sealants.

Stain Testing

Because of the staining problems that may occur with porous substrates, ZHIJIANG is willing to run laboratory tests and provide information to you on the possibility of staining occurring with the construction materials being used.

Wider joints accommodate more movement than narrow joints (Fig 1). When ZJ 2000 is being used for wide movement joint, a minimum depth of 6 mm and a maximum 12mm sealant/substrate bond is necessary to ensure adequate adhesion. A properly designed moving joint will have a 2:1 width to depth ratio.

The expansion and contraction of joints is mainly caused by season or daily temperature changes. The designed joint width is at least double estimated movement, better quadruple to remedy errors of materials and application. All size of joints should be gotten through calculation of joint movements, especially wider joint size necessary for plastic board with higher thermal expansion rations.

Surface clean

Cleaning all grease, dirty, water, klunky sealant from surface, accessories and protective coatings and any pollutant left inside joints and sunken parts.

Metal and glass should be cleaned by two-cloth. The solvent used will be methyl ethyl ketone, tolune or xylene and observe the using rule. If for plastic, use the guided solvent from suppliers.

Depending on the condition of the surface, porous substrates may require abrasion cleaning, solvent cleaning or both. Surface must keep dry and clean. Dirties and other impurities should be blew off by non-oily compressed air or gulfed by vacuum cleaner.

It's commonly not necessary for priming on using zhijiang silicone sealant. If recommending primer after adhesion tests pour zhijiang primer to a clean, dry, lint-free cloth and gently wipe surface till a thin film formed. Later application.

Masking

Masking tape should be used to keep excess sealant from contacting adjacent areas where it is not intended, to ensure an aesthetically pleasing job. Tool the sealant with light pressure before a skin begins to form (typically 10 to 20 minutes). Remove the masking tape before the sealant skins over.

Backer materials

Generally, three common backer rod types can be used : Open-cell polyurethane, Closed-cell polyethylene, Non-gassing polyolefin. When a backer rod cannot be positioned in a joint opening, a Teflon or polyethylene tape should be used to prevent three-sided adhesion

Install backing material or joint fillers. Set blocks, shims and tapes. Cut the nozzle of ZJ-2000 and fit into gun and make extrusion diameter fit for joint. Continuous extrude sealant into joint without air forming. Care must be taken to ensure complete fill of the sealant cavity. Tool the sealant with light pressure before a skin begins to form. Make sealant surface a sunken shape using raised tool. Not use soap water for assistant. Remove the masking tape after tooling. The sealant for bottom joints should be tooled into slope to protect water accumulation. The surface of sealant should be dry and frost-free. The uncured sealant is not permitted to contact with polished granite, metal or glass to preventing a thin film formed on the substrate surface to affect the esthetic things. Use masking tape. If sealant contact with non-porous material, clean out with methyl ethyl ketone, tolune or xylene.

Sealant repair

If a sealant has failed, it is good practice to understand why it failed and decide which measure to take. To see:Whether aging of original sealant;Joint movement over the bearing ability for sealant;

Adhesion loss or incompatibility between sealant and joint material;Thickness not proper of sealant;Others.

Handling Precautions

3. Rinse eyes with large quantities of water and seek medical check if sealant drops into eyes.