Gucheng County, Hengshui Two-Component Sealant Supply – Custom Sizes, Lead Time and Technical Support

Published on 2026-10-20

Hengshui Zhanhe Engineering Rubber Co., Ltd. supplies two-component sealant and related engineering rubber products to contractors, distributors and infrastructure projects worldwide. A base compound and a curative are mixed on site and gunned into the joint, where they cure into a rubber-like elastic seal that follows joint movement.

This article explains the working principle, main types, typical applications, installation points, selection criteria, standards and frequently asked questions about two-component sealant, and is intended for engineers, purchasers and project managers.

1. What Is Two-Component Sealant?

A base compound and a curative are mixed on site and gunned into the joint, where they cure into a rubber-like elastic seal that follows joint movement.

Working principle: The product works through elastic deformation and mechanical interlock to provide reliable sealing or load transfer.

2. Main Types

• Two-component polysulfide sealant: resistant to water, oils and sewage environments
• Two-component polyurethane sealant: good elasticity and adhesion for building and bridge joints
• Self-levelling grade for horizontal joints
• Non-sag grade for vertical and overhead joints

3. Typical Applications

• Deformation joints in utility tunnels, applied over the embedded waterstop
• Wall and floor joints in sewage and water tanks
• Joints between bridge parapets and the deck, and edge joints beside expansion devices
• Panel joints of precast concrete facades

4. Installation and Construction Points

1. Remove loose concrete, old sealant, oil and dust down to a sound, dry substrate
2. Insert a foam backer rod where the joint is deep, with a fill depth of roughly 0.5-0.7 times the joint width
3. Apply the matching primer and let it flash off
4. Weigh both parts to the stated ratio and mix for 5-10 minutes until the colour is uniform, scraping the sides and bottom
5. Gun from the bottom of the joint upwards and tool firmly against both faces
6. Protect from rain, dust and traffic during cure and keep it out of water for the first 24 hours

5. Selection Guide

• Confirm the design displacement, load grade and service environment before ordering.
• Select material grade according to temperature range, medium and durability requirements.
• Provide drawings or a specification list so that the manufacturer can verify sizes.

6. Standards and Quality Control

Two-Component Sealant is manufactured and inspected according to applicable national and industry standards. Hengshui Zhanhe Engineering Rubber Co., Ltd. carries out batch inspection before delivery, and inspection certificates together with third-party test reports (where required by the project) can be provided.

Typical standards applied to this product family include Chinese national and transportation industry standards; equivalent international standards can be referenced upon request.

7. FAQ

Q: When can the sealant get wet?

A: Tack-free time is normally within 24 hours at 25°C and 50% relative humidity, but full cure of a deep bead may take 3-7 days. Keep rain off for the first 24 hours and allow more time in cold or humid weather.

Q: Why is a backer rod needed?

A: It controls the depth and stops the sealant bonding to the bottom of the joint. Three-sided bonding tears the sealant as the joint opens, and over-deep filling in a wide joint is a common cause of cracking and loss of adhesion.

Q: What if the mixing ratio is wrong?

A: Too little curative leaves the bead permanently soft; too much makes it cure fast and turn brittle. Weigh both parts rather than judging by eye, and mix until no streaks remain.

Q: How is old sealant replaced?

A: Cut out the old bead and any failed bond line down to sound substrate, remove the dust, prime and refill. Where only part of the joint is renewed, test compatibility between old and new material on a small area first.

8. Price Factors

Quoted by weight or by the paired A plus B pack. Cost depends on the base polymer, filler loading, curative, packaging and mixing accuracy. Polysulfide grades commonly fall between 15 and 35 yuan per kg, with polyurethane slightly lower. Estimate volume as joint width times depth times length, convert using a density of roughly 1.3-1.6 kg/L depending on the formulation, and add 5%-10% for waste.

Packing: standard export packing (woven bags, pallets or wooden cases). Delivery terms: EXW, FOB, CFR, CIF or DAP as agreed. Payment terms: T/T, L/C or other terms subject to negotiation.

9. Why Work With Hengshui Zhanhe Engineering Rubber Co., Ltd.

• Manufacturer based in Hengshui, Hebei — the engineering rubber industry cluster in North China, with in-house production and inspection.
• OEM and ODM supported: sizes, hardness, profiles and packaging can be customized to project or market requirements.
• Batch inspection before shipment; certificates of conformity and third-party test reports available when required.
• Technical support for selection, shop drawings and installation guidance, with export packing and worldwide logistics arrangement.

10. Contact and Quotation

For specification sheets, samples, pricing or project support, please contact Hengshui Zhanhe Engineering Rubber Co., Ltd.. Email: 150051331@qq.com · Tel/WhatsApp: +86-13833886677 · Factory: No.168, Zhangtuantuo Village, Dengzhuang Town, Taocheng District, Hengshui, Hebei, China. We reply to export enquiries within 24 hours on working days.