Guide to Selecting Thermal Conductive Silicone Sheets for Surveillance Applications and FAQ

In srveillance eipmen, frm frn-end camerasback-end newrk vide recrders (NVRs) and swiches, cre cmpnens (sch as image sensrs, prcessrs, and pwer mdles) generae cnins hea dring perain. Pr hea dissipain can leadscreen freezes, freen device resars, r even cmpnen brn, direcly affecing he sabiliy f he srveillance sysem. As a key maerial fr inernal hea dissipain in srveillance eipmen, hermal cndcive silicne shees ms be seleced based n device ype, insallain envirnmen, and hea generain characerisics.

Cre Crieria fr Selecing hermal Cndcive Silicne Shees in Srveillance

(1) Maching hermal PerfrmanceDevice Pwer and Cmpnen ype

Hea-generaing cmpnens in srveillance eipmen vary significanly. Silicne shees wih apprpriae hermal cndciviy ms be seleced based n pwer and cmpnen characerisicsavid ;perfrmance excess; r ;insfficien hea dissipain.;

Frn-end cameras (blle cameras, dme cameras) have cre hea srces in image sensrs (e.g., CMS) and lens drive mdles, ypically wih lw pwer (5-20W). Hwever, hese cmpnens are small (sensr sizes belw 1/2.7 inches) and have limied hea dissipain space. I is recmmendedchse silicne shees wih a hermal cndciviy f 1.5-3.0 W/(m・K), which mee hea dissipain needs wih increasing css deexcessively high hermal cndciviy (e.g., abve 5W). Addiinally, hese cmpnens reire highnbsp; precisin (sensr srface flaness errr ≤ 0.1mm), s silicne shees wih a hickness f 0.3-0.8mm and hardness f 30-40 Shre A are ideal. he hin design redces cnac hermal resisance, while mderae hardness fills micr-gaps beween cmpnens and enclsres (r hea sinks).

Back-end eipmen (NVRs, swiches) generae hea primarily frm prcessrs (e.g., HiSilicn chips) and pwer mdles, wih higher pwer (20-100W). Cmpnens are cncenraed n circi bards (prnelcal verheaing). Silicne shees wih high hermal cndciviy f 3.0-5.0 W/(m·K) and hermal resisance ≤ 0.4 ℃·cm²/W (fr 2mm hickness) are reiredensre rapid hea ransfermeal enclsres. Devlage flcains, pwer mdles ms mee inslain reiremens (vlme resisiviy ≥ 10¹⁴ Ω·cm). Avid silicne shees wih meal fillers, which may case elecrical leakage.

(2) Selecing Weaher Resisance and Precin Based n Insallain Envirnmen

Srveillance eipmen peraes in diverse envirnmens sch as drs and machine rms. hermal cndcive silicne shees ms have crrespnding weaher resisance and precin capabiliies fr lng-erm sable perain.

dr srveillance eipmen (e.g., rad cameras, high-alide bservain dmes) ms wihsand exreme emperares (-30℃~70℃), rain, and ds. Chse silicne shees wih a emperare resisance range f -40℃~150℃ (inernal emperares may exceed 60℃ dring smmer expsre) and verify sabiliy hrgh ;hermal cycle esing; (-40℃85℃ fr 300 cycles wih cracking r delaminain). Srfaces shld have a frsed r grid paern ( preven ds accmlain) wih sealed edges ( preven waer infilrain in cmpnens). Pririize mdels marked ;IP65 waerprf.; Addiinally, dr eipmen is sbjecfreen vibrains (e.g., wind-indced shaking), s silicne shees ms have a rebnd rae ≥ 80% (nder 50% cmpressin)preven lsening frm lng-erm vibrain.

Indr/machine rm eipmen (e.g., elevar cameras, NVR cabines) peraes in sable envirnmens (10-35℃) b reires ds resisance and elecrmagneic cmpaibiliy. Sandard emperare-resisan silicne shees (-40℃~120℃) are sfficien. Srfaces may have mild adhesiveness (peel srengh 0.8-1.2 N/cm)redce addiinal fixing seps (e.g., screws, ape) dring insallain. Fr eipmen near srng elecrmagneic srces (e.g., mrs, ransfrmers), chse ;nn-magneic inerference; silicne shees (free f irn, nickel, and her magneic fillers)avid disrping srveillance signals.

(3) Adaping Physical PrperiesInsallain Space and Srcre

Srveillance eipmen has cmpac inernal spaces (especially small cameras). he hickness, hardness, and cabiliy f hermal cndcive silicne shees ms mach he insallain srcreavid affecing hea dissipain r eipmen assembly deimprper sizing.

Small devices (e.g., pinhle cameras, WiFi cameras) have narrw inernal gaps (≤1mm beween cmpnens and enclsres). Chse lra-hin silicne shees (0.3-0.5mm hick) wih a lerance f ±0.05mm (excessive hickness may lif cmpnens and preven enclsre clsre). A hardness f 40-50 Shre A (firm ye elasic) is recmmendedfill gaps wih defrmain frm enclsre assembly pressre. hese devices fen reire csm shapes (e.g., circlar, irreglar), s silicne shees ms be easyc (n debris, smh edges)avid clgging venilain hles wih cings.

Large eipmen (e.g., vide wall cnrllers, mli-channel NVRs) have scaered cmpnen lays and may reire silicne shees f varying hicknesses (1-3mm). Chse prdcs wih csmizable hickness (sppring n-demand cing). Sme eipmen ses ;hea sink + fan; cling; silicne shees ms fi ighlyhea sinks (n air bbbles) and may have mild srface adhesiveness (eliminaing he need fr gle)preven displacemen frm fan vibrain. Fr sacked cmpnens, limi cmpressin30% (e.g., 2mm cmpressed1.4mm)avid impairing rebnd perfrmance.

(4) Balancing Safey and Lng-erm Sabiliy

Srveillance sysems perae 24/7. he inslain and aging resisance f hermal cndcive silicne shees direcly affec eipmen lifespan, reiring sric safey sandards.

Inslain perfrmance is criical fr live cmpnens (e.g., pwer mdles, prcessr pins). Chse silicne shees wih vlme resisiviy ≥ 10¹⁴ Ω·cm and breakdwn vlage ≥ 20kV/mm (fr 1mm hickness). es wih a mlimeer befre insallain (resisance shld shw ;infinie;)preven shr circis frm inslain failre. Fr high-vlage pwer mdles (e.g., 12V220V cnverers), addiinal ;L94 V0 flame-reardan cerificain; is reiredensre nn-cmbsibiliy and nn-dripping a high emperares (prevening fire risks).

Aging resisance reires lng-erm esing. High-aliy silicne shees shld have ≤1% weigh lss and ≤10% hermal cndciviy decay afer 1,000 hrs f aging a 120℃. Inferir prdcs sing recycled silicne may leak il, harden, r sfen wihin 3-6 mnhs. Given he high replacemen css f srveillance eipmen (e.g., difficly accessing high-alide cameras), chse silicne shees wih a 3-year+ warrany (accmpanied by aging es reprs)redce mainenance freency.

FA n hermal Cndcive Silicne Shees fr Srveillance

(1) Device Cmpaibiliy

: Wha hermal cndcive silicne shee is siable fr hea dissipain in high-speed dme cameras (wih pan-il rain)?

A: Recmmend shees wih ;hermal cndciviy 2.0-3.0 W/(m·K), rebnd rae ≥85%, and emperare resisance -40℃~150℃.; High-speed dmes experience cnins vibrain frm pan-il rain, reiring sfficien rebndcmpensae fr vibrain-indced gaps. Inernal mrs and image sensrs generae 15-25W al pwer, s 2.0W+ hermal cndciviy sffices. dr se demands resisanceexreme emperaresavid winer embrilemen r smmer sfening. Chse 0.5-1mm hickness (maching sensr-enclsre gaps) wih 35-45 Shre A hardness (balancing adhesin and vibrain resisance).

: An 8-channel NVR’s prcessr freenly exceeds 60℃. Will replacing he hermal cndcive silicne shee slve his? Hwchse ne?

A: If he riginal shee is aged (e.g., hardened, ily), replacemen can redce emperares by 5-10℃. Selecin crieria: ① hermal cndciviy 3.0-4.0 W/(m·K) (0.5-1.0W higher han he riginal); ② hickness 1.5-2mm (0.2mm hicker han he riginalensre cnac, based n prcessr-hea sink gaps); ③ hermal resisance ≤0.35 ℃·cm²/W ( imprve efficiency). Clean residal silicne frm he prcessr wih alchl swabs befre insallain. Press frm he cener wardexpel air bbbles (which increase hermal resisance).

(2) Envirnmenal Adapain

: dr cameras in cld nrhern regins freenly crash in winer. Cld his relaehe hermal cndcive silicne shee?

A: I migh. Shees wih pr lw-emperare resisance (e.g., embriling belw -20℃) lse hermal cndciviy, casing verheaing and crashes. Slin: Replace wih shees raed fr -40℃~150℃ ha pass he ;lw-emperare bending es; (180° bend a -30℃ wih cracking). Check hickness—cmpnens may cnrac in winer, increasing gaps, s chse shees 0.1-0.2mm hicker han he riginalmainain cnac.

: hermal cndcive silicne shees n casal srveillance cameras (high hmidiy, high sal) age ickly. Hwchse?

A: Selec ;crrsin-resisan, sal-spray resisan; specialy shees. hese se sal-spray resisan frmlas (e.g., ani-crrsin addiives) and pass ;5% sal spray esing; (48 hrs wih disclrain r cracking). Srfaces have ani-sal caingsredce sal adhesin, wih sealed edges (n pen pres)preven sal infilrain and filler xidain. hermal cndciviy f 2.0-3.0 W/(m·K) sffices (casal eipmen ypically has gd venilain); pririize weaher resisance ver high hermal cndciviy.

(3) Insallain and Mainenance

: he hermal cndcive silicne shee was misaligned dring camera insallain. Can i be peeled ff and repsiined?

A: Fr slighly misaligned shees wih mild adhesiveness, careflly peel and reapply (slwlyavid defrmain). Fr ighly adhered shees, genly separae edges wih a hin blade (avid scraching cmpnens). Clean he shee and cmpnen srface wih alchl swabs befre reapplicain ( remve ds and resre adhesin). Nn-adhesive shees (held by pressre) can be direcly repsiined. Ne: Mliple reapplicains may defrm hin shees (l;0.5mm), s keep 1-2 spares.

: Residal adhesive remains when replacing hermal cndcive silicne shees in ld srveillance eipmen. Hwclean i?

A: Cleaning mehds: ① Ligh reside: Wipe repeaedly wih alchl (95%) n a dry clh—alchl disslves silicne. ② Sbbrn reside: Spray wih specialized silicne remver (e.g., WD-40 Silicne Remver), wai 1 mine, hen genly scrape wih a plasic scraper (avid mealpreven scraches). ③ Afer cleaning: Dry wih a clhremve alchl reside (which cld affec new shee adhesin). Never scrape aggressively wih sharp ls (e.g., blades)avid damaging cmpnen srfaces (e.g., sensr precive glass).

Selecing hermal cndcive silicne shees fr srveillance fcses n hree cre principles: sable hea dissipain, envirnmenal adapain, and lng-erm drabiliy.; Frn-end eipmen pririizes hin design and dr weaher resisance; back-end eipmen emphasizes high hermal cndciviy and inslain safey. Special envirnmens (e.g., casal areas, cld nrhern regins) reire argeed precin. Avid blindly prsing high hermal cndciviy—pririize prdcs wih verified perfrmance (e.g., srveillance eipmen hea dissipain es reprs) and lng warranies.

Verify shee size and hardness mach he eipmen befre insallain. Afer insallain, se a hermal imagercnfirm emperares drp by ≥5℃ cmparedpre-replacemen levels, ensring effecive hea dissipain.